Four Winns Freedom 190 (1989) — Service Hub

Sam's boat · Spring commissioning + ongoing service · Updated 2026-06-09
Note: the URL slug /equipment/fourwinns-h190/ is legacy (kept so links don't break) — the boat is a 1989 Freedom 190, NOT the modern (2022+) H-series H190.

Hull

1989 Four Winns Freedom 190

Engine

OMC Cobra 4.3L V6

HIN

4WNTH065L889 (SAM-CONFIRM: recorded research shows ...L890)

Storage

Trailer, driveway

Spring commissioning progress 0 of 5 tasks complete

Each task is its own tab — tap to switch

⚠ SAFETY WATCH (updated 2026-06-09) — improving: a working auto bilge is back in.

The boat has a slow transom leak (above the drain plug). The bilge pump situation has improved: the original Rule-Mate 500 is working again (auto sensing + pumping), so there's a functioning automatic bilge (no longer the manual-every-few-hours situation). The second pump runs but won't move water (under inspection); a new pump arrives tonight.

Make it bulletproof + fix the leak: keep the working auto pump + add the new pump as a backup on its own higher float + a high-water alarm + keep the battery charged; then plan the leak's real fix at a haul-out. A boat with a known leak shouldn't lean on a single pump. Details: transom leak · bilge pump.

Current state (2026-06-09): LAUNCHED 2026-06-05 and running. Spring commissioning done — dewinterized, drain plug in, battery + terminals, electrical sorted; engine turns + starts. Open items: (1) transom LEAK above the drain plug (HIGH — real fix likely haul-out); (2) BILGE PUMP — IMPROVING: one Rule-Mate 500 working (auto bilge back in); second under inspection; new pump incoming (still: add backup + high-water alarm); (3) starboard freeze/core plug popped out (HIGH — reseat + crack-check); (4) outdrive gear oil deferred (appears full; SAM-CONFIRM electric-vs-mechanical shift before a lower-unit fill). See the sections below.

Tap a task to begin

⛳ Dewinterize todo

Close petcocks + reconnect coolant tubes (~30 min)

⚙ Outdrive gear oil todo

~64 oz 80W-90 marine, fill from MIDDLE port (~30 min)

🔋 Battery + terminals todo

SuperStart 24DCM + Duralast DL06067 + new lugs (~45 min)

🛡 Engine oil change todo

~4.5 qt 25W-40 marine, extract via dipstick (~45 min)

🚰 Muffs test todo

15-20 min on garden hose, validate all systems

Recommended order: Dewinterize first (mechanical setup), then gear oil (outdrive cannot run dry), then battery (electrical), then engine oil (fluids), then muffs test (validates all of it). Each task tab has its own complete procedure.

Battery spec match

SuperStart 24DCM: Group 24 / 575 CCA / flooded dual-purpose. Meets OMC minimum (Group 24M min, 27M preferred, ≥650 CCA preferred). 575 CCA below the preferred mark but adequate for warm-engine spring starts. Full match table in Battery tab.

What's already done

✓ Fall 2025 winterization complete
✓ SuperStart 24DCM battery acquired (replaces failed NAPA 7575)
✓ Duralast DL06067 color-coded terminals acquired
✓ Engine oil + filter on hand
✓ OMC Cobra 4.3L service procedure documented (prior session)
✓ Diagnostic Hypothesis Log DHL-001 (battery failure) converged on H1

❄ OPEN ISSUE — brass freeze/core plug popped out (starboard), needs proper repair

What happened (2026-06-08): a brass freeze / core plug on the STARBOARD side of the engine block, just above the mount, popped out. Sam tapped it back in enough to hold to get to the dock — it needs a proper repair.

What it is: a brass core / freeze plug (marine engines use brass, not steel). These do NOT just fall out — one is normally pushed out by either (a) ICE in the water jacket (winterizing not fully done) or (b) corrosion flakes building up and expanding behind it.

⚠ CRITICAL CRACK-CHECK — do this before trusting the engine.

If the plug was pushed out by freezing, the block itself may also be cracked. After reseating the plug:

Run the engine a few minutes, then CHECK THE OIL. Milky / chocolate-colored oil = water intrusion = an internal crack/breach (serious). Clean oil = likely OK.
Watch for external coolant/water leaks around the block.
Check the OTHER freeze plugs — more than one can pop if the cause was freezing.

Proper fix options:

(a) BEST — new brass plug: support the engine and take weight off the mount (lift the front, wood blocks under the oil pan), unbolt the mount, clean the bore, install a new brass plug with Permatex sealant.
(b) EASIER (if the mount blocks access): a Dorman rubber EXPANSION plug — the center nut tightens to expand and seal it, with no mount removal.
(c) TEMP (what Sam did): tap the old plug back in all around the edge (don't hammer hard) — gets you home, but needs a proper reseat + sealer or replacement to be permanent.

Measured 2026-06-10: the plug + bore look FINE / reusable, but access is TIGHT and Sam doesn't want to pull the engine — see the install procedure below (rubber now / brass later). Plug size = 1.5" (measured 2026-06-10). Sam is ordering a 1.5" RUBBER expansion plug from Amazon (the rubber-now fix). Tracked as issue fourwinns-freezeplug-starboard-2026-06-08.

🔧 Install procedure — tight access, no engine pull (measured 2026-06-10)

The plug + bore look reusable, but it's a tight spot and Sam isn't pulling the engine. Rubber-now / brass-later plan + the no-hammer tight-space methods:

Recommended plan

NOW (tight space, quick, good for a season or two): a RUBBER EXPANSION PLUG. The purpose-built tight-access fix. Drop it in the bore, tighten the center bolt/nut with a wrench/socket → the rubber compresses and expands outward against the casting. No hammering, no perfect squareness needed, no engine removal. ⚠ NO SEALANT on a rubber expansion plug — the nut expands it to seal. No torque spec: tighten until firmly seated, won't turn by hand, rubber bulges slightly. Honest life: rubber degrades from heat cycles — ~a couple years / "gets you to the proper fix"; replace if it starts to weep.
LATER / PERMANENT (next haul-out): a BRASS cup plug. Brass = correct (doesn't corrode; steel rusts). Do the permanent brass plug at the upcoming haul-out (transom-leak / bellows work) when access is better and the boat's out — bundle it with that job.

If reusing the brass cup plug (it looks fine) — tight-space, NO-hammer method

Bolt-and-washer PRESS (preferred in tight spaces): thread a long bolt + large washer + a socket / plug-installer sized just under the plug's OD against the plug, and tighten the nut to DRAW the plug squarely + evenly into its seat — presses it in with no hammer swing and without cocking or deforming it. (Some brace the bolt against the engine frame and back it out to push the plug in.)
Brass/metal cup plug GETS sealant: a thin layer of RTV silicone or Permatex around the edge BEFORE pressing in (unlike the rubber plug, which gets NONE).

⚠ Prep + checks (mandatory)

CLEAN THE BORE FIRST — wire-brush / sand / die-grind to clean metal so the plug seals against clean metal, not corrosion (bore looked fine — clean it anyway).
Do NOT punch the old plug INTO the water jacket — that drops debris into the cooling passages.
After install: refill coolant, run to temp, check for leaks, and CHECK THE OIL for milkiness / chocolate (the cracked-block test above — if it froze hard enough to push the plug out, the block may be cracked; milky oil = water intrusion = serious). Re-check the OTHER freeze plugs (if one pushed, others may follow).

Root cause — freeze vs corrosion. Determine which pushed it out. If freeze, the winterizing process needs fixing (water jacket not fully drained / antifreeze not circulated) so it doesn't recur — and the crack-check above is essential. (Freeze-plug cause, brass-not-steel, crack-check via milky oil, mount-removal vs rubber-expansion-plug + Permatex per JustAnswer / The Hull Truth / Boatered / iboats / marineengine.)

💧 OPEN ISSUE (HIGH) — slow LEAK above the drain plug (transom-plate / bellows area)

⚠ This is linked to the bilge-pump issue below — together they are sink-at-dock risk. A known slow leak is only safe while the bilge pump reliably + automatically keeps up. See the combined safety + priority note at the top of this page.

Symptom (2026-06-08): a slow leak — water dripping in from a protrusion / plate just ABOVE the drain plug (NOT the drain plug itself). It leaked a bit last year too. SAM-FILL: review the leak VIDEO for the exact entry point (which fitting/seam/plate).

Likely cause: on a sterndrive Four Winns, the area just above the drain plug on the transom plate behind the drive is the bellows / gimbal / transom-assembly interface. A 1990 Four Winns owner reported the identical symptom ("water from a hole on the plate attached to the transom, just above the drain plug") — the experienced answer was bellows, corrosion through the casting, or a waterlogged transom. So the most likely sources here: a failed/aged exhaust bellows, a transom-plate fitting/seal, a corroded casting, or wet transom wood — NOT the drain plug.

⚠ Honest key point: the real fix here likely needs a HAUL-OUT. A proper repair in this area (bellows / transom-plate reseal / casting) typically requires PULLING THE OUTDRIVE, which means the boat out of the water. "Fix it without hauling out" is genuinely limited for THIS location — the in-water options below buy time, they are not the permanent fix.

The leak is reported from the plate/fitting just ABOVE the drain plug — the transom-plate / bellows / casting zone, not the drain plug. Most of these sources sit at or below the waterline, which is why the real fix needs the drive pulled (haul-out). Schematic — not to scale.

Options — from the real fix to buying time

Real fix (haul-out)Pull the drive; inspect/replace the bellows (exhaust / shift / driveshaft), reseal the transom plate with marine sealant, and address any corroded casting or wet transom. If the bellows have never been done, they're overdue maintenance anyway (they have a service life). This is THE fix. SAM-FILL: bellows kit + transom-seal parts for the OMC Cobra.

In-water stopgapsBuy time, NOT permanent: underwater-cure epoxy / marine putty (Splash-Zone-type) on a small fitting/seam seep; reseal from the INSIDE if the leak point is reachable from the bilge (a through-transom fitting/screw resealed with marine sealant); and IF the "protrusion" is a bolted PLATE (not the bellows), remove the plate and reseal the screws/holes with 3M 5200 or BoatLife Lifeseal — doable on the trailer (quick out-and-back), not fully in-water.

Keep-it-afloat / manage the waterWhat people do with a minor known leak until haul-out: make the bilge system bulletproof (Part 2 below) — a reliable auto pump + a backup pump + a reliable float + a maintained battery (or solar maintainer) + a HIGH-WATER ALARM — and fix the leak at the next haul-out.

How to pin the exact source

Review the video first
Sam's leak video is the primary evidence — watch it to trace the drip to its origin (bellows vs plate-fitting vs casting vs transom seam). SAM-FILL: the exact entry point from the video.
Dry the bilge, then watch where water enters
Dry the bilge completely, get the boat in the water (or fill carefully on the trailer), and watch WHERE the water comes in — trace the drip back to its origin.
In-water-only vs on-trailer test
If it leaks only in the water → the source is below the waterline (bellows / casting / below-WL fitting — haul-out territory). If it also leaks on the trailer when you pour water at the plate → it's a plate/fitting/seam above the waterline (more likely a reseal you can do on the trailer).

Sources: marineengine (the 1990 Four Winns identical "plate above the drain plug" case); iboats / Boatered (drain-plate reseal with 3M 5200 / BoatLife Lifeseal); thousandislandslife (drain-hole / tube repair); louisianasportsman (through-hull / bilge leak sources). Verify the exact part/sealant against the OMC Cobra transom assembly before buying.

⚙ BILGE PUMP system (the leak's safety net) — IMPROVING (one auto pump working)

UPDATE 2026-06-09 — improvingThe ORIGINAL Rule-Mate 500 is now WORKING properly (auto sensing + pumping) — so the boat has a functioning automatic bilge again. Because a pump now runs and pumps on that circuit, the power + pump path (wiring / fuse / ground) is proven OK. The SECOND RM500 runs but won't move water → an internal pump fault (not the circuit) — Sam is taking it apart to inspect. Sam also ordered a NEW bilge pump (arriving tonight) for backup/primary. SAM-FILL: second-pump inspection result.

Still bulletproof it. One working auto pump is good — but a boat with a known slow leak wants a belt-and-suspenders bilge: the working auto pump + the new pump as a backup on its own higher float + a HIGH-WATER ALARM + keep the battery charged. The leak itself still wants its haul-out fix. (The earlier "running it manually direct-to-battery every few hours" is no longer the situation — the diagnosis history is kept below.)

Second RM500 — runs but no water output (under inspection)

One pump works on the same circuit, so this is pump-internal, not the circuit. Likely causes:

Impeller cracked, stripped on its shaft, or jammed with debris.
Airlock — a clogged anti-airlock vent (Rule-Mates have one) traps air so it spins without moving water.
Blocked strainer / intake.
Worn-out pump — impeller-to-housing clearance gone (spins, but no longer moves water).

Inspection checklist: impeller spins freely + not cracked + tight on the shaft; intake/strainer clear; anti-airlock vent clear.

Diagnosis reference (below) — how the failing-pump issue was worked + the standard wiring/float troubleshooting + safety upgrades. The Rule-Mate-vs-Rule clarification confirmed these are Rule-Mate (auto, no float) — kept for the second pump + finishing the job.

Symptom progression (record): worked on the float (auto) → then ran CONSTANTLY even with the float DOWN → swapped to a different pump, same behavior → then stopped working from the helm/boat switch → now Sam runs it manually direct-to-battery every few hours. Sam suspects he may have disturbed something in the wiring during recent electrical work. Sam has two "Rule-Mate 500" pumps.

⚠ CRITICAL CLARIFICATION (likely explains the whole thing) — "Rule-Mate" vs "Rule" are DIFFERENT products. Which one Sam has determines whether a float switch is even used. SAM-CONFIRM by reading the label:

RULE-MATE (RM500): an AUTOMATIC pump with sensing built INSIDE the housing — NO float switch, needs none. 2-wire (+/-), wired straight to power through a fuse; it senses water electronically and cycles itself. If it runs constantly even direct-wired → the INTERNAL SENSOR has failed (a known RM failure mode).
RULE (e.g. Rule 500): a PLAIN pump, NOT automatic. Needs an EXTERNAL float switch (or manual switch) to control it. Wired direct with no switch → runs CONSTANTLY (nothing tells it to stop).

Sam's note "I thought direct-wired it should control itself with the float" implies plain Rule pumps that HAD an external float — but confirm the label first.

What the symptoms mean — by pump type

If RULE-MATE (auto, no float)Direct-wiring is correct and it should self-cycle. Running constantly direct-wired = the internal sensor failed (replace) OR a wiring fault feeding it. Two RM pumps behaving the same = both failed (possible if old) OR a shared wiring/ground problem → check the wiring Sam touched FIRST.

If plain RULE (needs float)The "worked on float, then float-down-still-runs" history = the float switch failed/stuck/miswired; "stopped on the helm switch" = helm switch / wiring / fuse / ground fault; direct-to-battery always runs (expected — no float in that path). This fits the symptoms well → the EXTERNAL FLOAT SWITCH (+ the wiring disturbed during the electrical work) is the prime suspect. With two pumps, use the known-good one to isolate pump-vs-circuit.

Key deductionBecause two different pumps behaved identically, the fault is most likely UPSTREAM of the pump — the float switch and/or the wiring / helm switch / fuse / ground, not the pump itself. "Ran constantly with float down" = float stuck/failed/miswired (or auto + manual circuits crossed). "Stopped from the boat switch" = helm-switch / fuse / ground fault. Both point at the bilge + float wiring — retrace what the recent electrical work touched.

Standard plain-Rule wiring: ground, manual (helm switch), and auto (through the float switch, which closes when water rises). A Rule-Mate needs none of the float wiring — it's just +/- through a fuse. SAM-FILL: Sam's exact pump model + its wiring. Schematic — verify colors against the pump's own wiring doc.

Troubleshooting steps

1. Confirm the pump type + understand its wiring
Read the label (Rule-Mate = auto, no float, 2-wire; plain Rule = needs a float). A plain pump typically has 3 wires: ground, manual-on (from the helm switch), and auto (through the float switch). SAM-FILL: Sam's exact model wiring.
2. Test the FLOAT switch (prime suspect)
Disconnect it and hand-test: lift it → continuity; down → open. If it reads closed when down or sticks → replace it (a common, cheap failure). This directly explains "ran constantly with the float down."
3. Test the HELM switch + fuse + ground
Confirm 12V at the switch, continuity through it, and a good ground. A blown fuse / corroded ground / failed switch kills the manual circuit ("stopped from the boat switch").
4. Check for crossed wiring from the recent electrical work
The "runs always" + "switch dead" combo strongly suggests a wiring error — verify the auto and manual legs aren't bridged and the float is in the right leg. Retrace the bilge + float wiring against exactly what Sam touched.
5. Safety upgrades (do these regardless)
- A reliable new float switch (or an electronic / field-sensor type that doesn't stick).
- A BACKUP bilge pump on its own float, mounted higher.
- A HIGH-WATER ALARM.
- Keep the battery charged (the manual direct-to-battery method WILL fail when the battery drains — not a safe standing solution).

Sources: pump-maker wiring docs (Rule / Rule-Mate) for the auto-vs-float distinction; standard marine bilge-pump + float-switch wiring references (iboats / The Hull Truth bilge-wiring threads). SAM-FILL: confirm the exact model wiring + colors before rewiring.

Dewinterize the engine

Reverse what you did last fall: close petcocks, reconnect coolant tubes. The outdrive gear oil refill is a separate task (Gear Oil tab).

Materials & tools

Wrench set (1/2" or 13mm typically fits OMC petcocks)
Stainless hose clamps (new pair per connection, if old ones are corroded)
Flashlight + mirror (to inspect lower coolant tube connections)
Last fall's winterization notes/photos (to confirm what was disconnected)

🔗 Marine Parts House — Cooling system exploded view (1986-1993) Official OMC parts diagram showing petcock locations + coolant tube routing. Reference for finding each drain. ↗

Close all petcocks (engine block + manifold drains)
The OMC 4.3L Cobra has block drain petcocks on both sides of the engine (one per bank) and exhaust manifold drains. Also typically a drain on the seawater pickup line.
- Locate each petcock you opened last fall — typically 4-6 total
- Close each finger-tight, then snug with wrench
- Confirm all closed before moving to coolant tubes
Don't overtighten. Brass petcocks in cast iron/aluminum. Snug, not torqued. Overtightening strips threads.

📷
Add your photo when you do this

Photograph each petcock location on your engine for future reference. Sam can update this page with embedded photos.
Reconnect coolant tubes
Coolant tubes route raw water from outdrive up to engine. Usually clamped with hose clamps.
- Inspect for cracks or stiffness from cold storage — replace if any are stiff or cracked before reconnecting
- Reconnect to original positions (engine intake side is obvious from routing)
- Use new stainless hose clamps if originals are corroded
- Two clamps per connection (belt + suspenders, marine standard)

When done with this tab, move to Gear Oil — the outdrive cannot run dry.

Outdrive gear oil refill

Running an OMC Cobra outdrive dry will destroy bearings in minutes — gear oil must be confirmed full and properly burped (no trapped air) before the drive runs in gear.

Current state (2026-06-08): Sam checked the dipstick (looked OK) and opened the fill hole — oil oozed out, so the drive currently appears full. He's deferring the full gear-oil change for later. This section is the correct procedure for when he does it.

⚠ Stuck lower screws — resolve BEFORE the next service / running in gear. Last year Sam could not get the lower drain/fill screws out. If the drain/fill screws won't come out, the proper bottom-up fill + burp can't be done — so a stuck screw must be freed first (penetrating oil / careful heat / a proper-fit driver, not a rounded one). Don't run the drive under load on a gearcase you can't service.

Oil type — capacity ~64 oz / 2 qt. OMC "Hi-Vis" is now sold as OMC / BRP "Premium Blend." Acceptable substitutes: a quality marine 80W-90 or SAE 90 / 75W-90 gear lube (e.g. Quicksilver / Mercury High Performance Gear Lube SAE 90, or Walmart Super Tech Marine 80W-90). Never automotive non-marine gear oil, motor oil, or ATF. (Capacity + Hi-Vis = Premium Blend + 80W-90 / 75W-90 substitutes per iboats OMC-Cobra threads, engine-oil-capacity references, boatered / bobistheoilguy — updated 2026-06-08.)

⚠ CRITICAL FORK — electric-shift vs mechanical-shift (SAM-CONFIRM before filling the LOWER unit).

The Cobra shift type changes what oil the LOWER unit takes:

ELECTRIC-shift → the LOWER unit requires OMC "Type C" oil ONLY. Regular gear lube can cause clutch problems in an electric-shift lower. (The upper gearcase can use Hi-Vis / Premium Blend / 90wt.)
MECHANICAL / hydro-mechanical shift → standard marine 80W-90 / SAE 90 throughout is fine.

SAM-CONFIRM the shift type before filling the lower unit. (Electric-shift Type-C requirement per iboats / OMC-Cobra service references.)

Safety — neutral vs in-gear. Running on muffs in NEUTRAL to check water flow / sump is OK. Do NOT run in gear / under load until the gear oil is confirmed full and properly burped.

Monitor / reservoir bottle — SAM-CONFIRM. The standard 1989 OMC Cobra sets level with the drive-mounted dipstick gauge (the method below), not a remote gear-lube monitor bottle. If this rig has a monitor bottle fitted in the engine compartment, fill it to its FULL line after the drive is full and use it for ongoing level checks. Confirm whether one is present.

Materials & tools

SAE 80W-90 marine gear lube — ~64 oz / 2 qt (OMC Hi-Vis, Mercury Quicksilver, or Sierra 18-9750)
Gear oil pump (Sierra 18-9781 or universal hand pump that threads into fill port)
New crush washers / gaskets for drain + fill plugs (Sierra 18-2664)
Drain pan + shop towels
Torque wrench (in-lbs scale for fill plug)

OMC Cobra outdrive plug locations. Drain from BOTTOM (1), fill from MIDDLE (2), check level at TOP dipstick (3). Drive must be in trim-down/vertical position.

🔗 Marine Parts House — Gear housing exploded view Official OMC Cobra lower unit parts diagram (1986-1993). Shows drain/fill/dipstick plug positions with OEM part numbers. ↗ 🔗 OB Parts — How to Fill an OMC Cobra Outdrive (with photos) Canonical step-by-step tutorial with real photos of each plug location and the pump-from-middle procedure. ↗

FILL FROM THE MIDDLE PORT, NOT THE BOTTOM DRAIN.

Common DIY mistake: filling from the bottom drain. OEM procedure is fill from the MIDDLE port with a hand pump while leaving the top dipstick out (for air escape). Bottom-fill can trap air, which causes hydraulic lock or worse, an air bubble that melts gears under load.

Source: 1989 OMC Service Manual 0507759, Clymer 1986-1993, OMC-trained mechanics on iboats.com.

Position drive vertical (trim down)

Drive must be in full down / vertical position so all oil settles to the bottom. If trim is broken, lower manually with pry bar against the trim ram, supporting safely.
Verify bottom drain plug status (still open from winterization)

Bottom drain plug should still be removed from winterization, or finger-tight if you put it back. Confirm before next step.
Catch any residual drainage, install bottom plug
- Place catch pan under bottom drain
- Wait a minute to confirm nothing more is dripping
- Install bottom drain plug with new crush washer
- Snug, don't overtighten — aluminum threads
Remove top dipstick (for air escape during fill)

Top plug is the dipstick. Set aside loosely (you'll need it shortly). Leaving top open lets air escape as oil pumps in from middle port.
Remove middle fill plug, insert pump
- Middle port is on the side of the drive (port or starboard depending on orientation)
- Remove the middle fill plug. Small amount of residual oil may drip — normal
- Insert gear oil pump tube into middle port. Most thread in directly
📷
Photo opportunity

Capture the middle fill port location on YOUR drive specifically — angle and accessibility vary by trim position and boat orientation.
Pump oil in slowly until level reaches dipstick
- Pump slowly. Watch top dipstick hole — air escapes as oil rises
- Insert dipstick (just rest on threads, do NOT screw in)
- Periodically check level by lifting dipstick and reading. Wipe clean between checks
- Stop pumping when oil reaches FULL mark on dipstick (still just resting in hole)
- Capacity ~64 oz / 2 qt. If you've pumped much more, stop and check for a leak
Why dipstick rests during fill: Screwed down = operating level. Loose during fill = slight overfill cushion that accommodates air bubbles when drive warms up. Per OEM service manual.
Screw dipstick in fully (creates air lock)

Once oil is at level mark (with dipstick just resting), screw dipstick all the way in. Creates the "hydraulic lock" / air lock that prevents oil from gushing out when you remove the pump.

Dipstick torque: 10-12 ft-lbs (14-16 N·m). Snug but not crushing.
Quickly remove pump, install middle fill plug
- Pull pump out of middle port
- Small amount of oil will drip during swap — that's fine, just be fast
- Thread middle fill plug back in immediately with new crush washer
- Torque to 60-84 in-lbs (7-9 N·m)
Wipe drive clean, run engine briefly, recheck level
- Wipe oil spillage from drive housing
- Run engine ~30 seconds on muffs (water flowing) at idle. Circulates oil through upper unit, lets air bubbles surface
- Shut down. Wait 5 min for oil to settle
- Remove dipstick, wipe, reinsert and screw in fully, remove and read level
- If below FULL: top off through dipstick hole with long-spout funnel
- Reinstall dipstick to torque spec

Battery + terminal install

Replaces the failed 2018 NAPA 7575 from DHL-001 (sulfated after winter storage with parasitic draw).

Materials & tools

SuperStart 24DCM battery (already acquired)
Duralast DL06067 terminals (already acquired) — 2 pack, red + black
Marine-grade crimp lugs at verified wire gauge (size after cutting old terminals; expect 4 AWG or 2 AWG)
Adhesive-lined heat-shrink tubing rated for marine use
Heat gun (NOT a lighter)
Marine-grade wire crimper
Multimeter (for cranking circuit + parasitic draw verification)
Dielectric grease or terminal protector spray
Wire brush + baking soda solution (battery tray cleanup)
Gloves (sulfated battery may have leaked)

SuperStart 24DCM with Duralast DL06067 color-coded terminals. Sequence: positive first when installing, negative first when removing.

🔗 AutoZone — Duralast DL06067 product page SKU 95964. Product specs, hardware included, replacement availability. ↗

Why DL06067 (bolt-on) vs DL06070 (wing-nut)?

DL06067 is bolt-on with proper torque hardware. DL06070 is marine wing-nut style. For permanent installation with vibration exposure, bolt-on is more mechanically secure — won't loosen over time. Wing-nut is better for tool-free maintenance access, but for a boat serviced 1-2x/year, that's not a real benefit.

Remove old battery + terminals
- Wear gloves — sulfated battery may have leaked acid residue
- Disconnect negative (-) cable FIRST, then positive (+)
- Remove old battery from tray
- Clean battery tray with baking soda + water if corrosion residue
- Dispose properly (AutoZone/O'Reilly accept core return for refund)
Cut off old corroded terminal ends
- Cut back to clean (uncorroded) copper wire
- Tinned marine wire shows silver; standard copper shows orange/red
- If wire is dark/black or green inside insulation, keep cutting until bright copper
Don't reuse old crimp lugs. Green/white corrosion at the lug barrel wicks up into wire strands by capillary action. Cut back until bright copper, install fresh lugs. The whole point is fixing the corrosion problem that killed the last battery; reusing partial lugs re-creates the failure.

📷
Capture wire gauge proof

Photograph the freshly cut wire with a gauge tool or ruler for reference. This locks in what crimp lug size to buy.
Measure wire gauge, buy matching crimp lugs
- Use wire gauge tool, or compare to known-gauge wire
- OMC Cobra 4.3L starter cable: expect 4 AWG or 2 AWG. Don't guess — measure
- Buy marine-grade crimp lugs at verified gauge + adhesive-lined heat-shrink
- AutoZone, West Marine, Sierra Marine all stock these
Strip, crimp, heat-shrink
- Strip ~3/8" of insulation from cable end
- Slide heat-shrink onto cable FIRST (push back out of the way)
- Insert wire into crimp lug barrel
- Crimp with proper marine crimper
- Slide heat-shrink over the crimp covering lug barrel + ~1/2" of wire insulation
- Heat with heat gun, NOT lighter (uneven flame damages insulation)
Install SuperStart 24DCM in tray
- Position battery in tray. Positive must reach without cable strain
- Secure with USCG-compliant hold-down (existing strap if not corroded)
Bolt DL06067 terminals + connect cables (POS first, NEG last)
- Bolt RED (+) DL06067 onto positive top-post stud first — 8-10 ft-lbs
- Bolt cable's crimp lug to the DL06067 terminal's bolt
- Repeat for BLACK (-) negative side
- Sequence matters: Connect positive first, negative last. Disconnect reverse. Prevents arcing if wrench bridges to ground.
- Apply dielectric grease or terminal protector over finished connections
Verify cranking circuit BEFORE running engine
Don't start engine until you've verified battery wired correctly.
- At-rest voltage at terminals: should read 12.6-12.8V (fresh battery)
- Try cranking briefly (1-2 sec) — should crank cleanly
- Engine running ~1500 RPM, voltage at battery: 13.0-14.7V (OMC charging spec)
- If voltage stays under 12.6V with engine running: alternator/regulator fault — STOP, don't run further until diagnosed
- If voltage exceeds 15V: regulator fault, overcharging — STOP, will boil battery
Parasitic draw check (closes DHL-001 H3)
This is what killed the last battery. Run this test on the new install.
- Key OFF, key out of ignition, all accessories OFF
- Disconnect negative cable from battery
- Multimeter in series between cable end and battery negative post
- Set meter to DC current, 200mA range
- Reading: should be <25mA
- If >100mA: parasitic load that will kill this battery just like last one. Pull fuses one at a time, watch for current drop, to find the leak

Engine oil change — OMC Cobra 4.3L V6

Filter and oil already on hand. Confirm what you have matches spec below before starting.

Materials & tools

SAE 25W-40 marine oil — ~5 quarts (you have on hand; confirm it's marine-spec)
Oil filter (you have on hand; confirm fitment to OMC 4.3L)
Manual extraction pump (Pela 6000, Topsider, or hand pump) — needed to extract through dipstick tube
Oil filter wrench
Drain pan (4-5 qt capacity minimum)
Shop towels
Funnel with long spout (for refill)

OMC Cobra 4.3L V6 oil change touchpoints (simplified top-down view). A = oil filler cap (top). B = oil filter (passenger side). C = dipstick tube (for extraction).

🔗 Marine Parts House — OMC Cobra 4.3L engine exploded view Official OMC parts diagram showing filter location, dipstick tube, oil pump. ↗

Specifications

Item	Recommendation	Notes
Oil viscosity	SAE 25W-40 marine (preferred) OR SAE 30 (acceptable)	Marine detergent oil. Mercury 25W-40 4-Stroke, Pennzoil Marine 25W-40, Sierra 25W-40.
Capacity (with filter)	~4.5 quarts	OMC 4.3L V6 nominal. Verify level on dipstick after filling 4 qt.
Oil filter	OMC/Mercury 35-866340Q03 OR Sierra 18-7824 OR WIX 51394 / FRAM PH3614	Same filter mount as GM 4.3L automotive. Marine filter preferred (anti-drainback valve more robust).

Don't use synthetic without verifying. Older marine engines with traditional seals can leak with synthetic. Conventional or synthetic blend marine 25W-40 is safer for a 1989 build.

Warm the engine (recommended)

Run on muffs 5-10 min to warm the oil. Warm oil drains faster and carries more contaminants out. Cold drain still works, just slower and less complete.
Extract old oil through dipstick tube
Marine engines typically don't have an accessible gravity drain. Most boat owners extract through dipstick tube with hand pump.
- Remove dipstick
- Feed extraction tube down dipstick tube until it bottoms out in pan
- Pump until no more oil comes out (4-5 qt typical)
- Dispose properly (AutoZone/O'Reilly accept used oil free)
Replace oil filter
- Locate filter on engine block (passenger side on OMC 4.3L Cobra)
- Place catch pan under filter (some oil will spill)
- Remove old filter with filter wrench (counter-clockwise)
- Wipe filter mount gasket surface clean
- Apply thin coat of fresh oil to new filter's rubber gasket
- Hand-tighten new filter until gasket contacts, then 3/4 turn more
- Do NOT use wrench to tighten (overtightens, traps gasket)
Refill with new oil
- Pour 4 qt of 25W-40 marine oil into oil filler cap
- Wait 2 min for oil to settle into pan
- Check dipstick — should read just under FULL
- Top off slowly to FULL (typically ~0.5 qt more = 4.5 total)
- Reinstall oil cap firmly
Run + re-check
- Start engine, idle 30 sec — oil pressure light should go out within 5 sec
- Inspect filter area for leaks
- Shut down, wait 5 min for oil to settle
- Recheck dipstick. Top off if needed
- Log the change in Service Log tab (date + engine hours if tracked)

Muffs test — final pre-launch validation

Before trailering to the launch, run engine on garden hose muffs to verify everything works. Do this AFTER all other tabs.

Materials & tools

Garden hose (50+ ft, depending on access)
Standard "ear muffs" / flush kit for OMC Cobra (Sierra 18-7720 or similar)
Multimeter (charging voltage verification during run)
Tap water source (hose bib)

Attach muffs over outdrive water intakes

Muffs cup over the side water intake grilles on outdrive lower unit. Seal with rubber pads. Some pressure required — muff strap or spring keeps them clamped on.
Turn on water FIRST, then start engine

Water must be flowing BEFORE engine starts. Dry impeller damage is the most common DIY mistake. Even 10 seconds dry can damage the water pump impeller.
Verify telltale stream within 30 seconds

Water should exit the "pisser" tell-tale port (small visible stream from lower unit/exhaust). No stream = impeller failure or blocked intake. SHUT DOWN immediately if no stream.
Run 15-20 minutes, verify all systems
- Telltale stream visible the whole time
- No coolant leaks at reconnected tubes (visual inspection)
- Engine reaches normal operating temp (140-180°F typical) without overheating
- Charging voltage at battery 13.0-14.7V (measure with multimeter on terminals)
- No new fluid leaks (oil, gear oil, fuel)
- Engine idles smoothly after 5-10 min warm-up
- No unusual noises (knocking, grinding, screeching)
Shut down sequence
- Shut down engine first
- Wait 10-15 sec for cooling water to clear
- Turn off water
- Remove muffs

All checks pass: Boat is ready for trailer + water test at the launch.

ANY check fails: DO NOT trailer. Diagnose on the trailer in the driveway where you have access to tools.

Boat & engine reference

Hull

Make / model	Four Winns Freedom 190 (1989, OMC-era Freedom line: 150/170/190). NOT the modern (2022+) H-series H190 — that's a different boat; the legacy URL slug still says h190.
Year	1989 model year (Dec 1988 manufacture)
HIN	`4WNTH065L889`
Length	19 ft 0 in
Hull type	Fiberglass, open-bow bowrider
Owner	Samuel Michael Foran

Engine & drive

Engine	OMC Cobra 4.3L V6 (GM-based 262 cu in, marinized ~190 hp)
Engine MOD	`432APRMED`
Engine SER	`T1132957`
Drive MOD	`985685`
Drive SER	`T064953` (partial)
Production	1986-1993 (OMC Cobra line). OMC bankruptcy 2000.

Battery

Current (new):	SuperStart 24DCM — Group 24, 575 CCA, 12V flooded dual-purpose marine
Previous (failed):	NAPA Legend 7575 (Group 75, ~Jun 2018, ~7.8 yr old, sulfated)
OMC spec:	BCI 24M minimum, 27M preferred. ≥650 CCA preferred. Top-post threaded.
Charging spec:	13.0–14.7V at battery, engine running, 1500 RPM

Battery terminals (this installation)

Part	Duralast DL06067 (AutoZone SKU 95964)
Description	Universal top-post bolt-on, epoxy-coated, color-coded red/black
Quantity	2-pack (1+ / 1-)
Price	~$10.99-11.99
Cable gauge (TBD)	Measured after cutting back corroded terminals. Expected: 4 AWG or 2 AWG.

Outdrive gear oil

Type	SAE 80W-90 marine gear lube (OMC Hi-Vis, Mercury Quicksilver, Sierra 18-9750)
Capacity	~64 oz / 2 qt
Fill port	MIDDLE plug
Drain port	BOTTOM plug
Level check	TOP dipstick
Fill plug torque	60-84 in-lbs (7-9 N·m)
Dipstick torque	10-12 ft-lbs (14-16 N·m)

Engine oil

Type	SAE 25W-40 marine (preferred) or SAE 30
Capacity	~4.5 qt with filter
Filter options	OMC/Mercury 35-866340Q03, Sierra 18-7824, WIX 51394, or FRAM PH3614

Charging system

Alternator	Motorola/Prestolite 51 A, 12V, internal regulator
OMC part #	`0985465` or `0985466`
Mounting	2" mounting foot, OMC Cobra 1987-1993 across 2.3L/3.0L/4.3L/5.0L/5.7L

Manual & diagram sources

📚 Marine Parts House — Complete OMC Cobra exploded views (1986-1993) Free online parts catalog. Browseable by system: gear housing, engine, cooling, electrical, drive assembly. Each diagram includes OEM part numbers. ↗ 📚 Crowley Marine — OMC Stern Drive parts lookup Free interactive parts lookup with exploded views. Filter by year/engine. Cross-references OEM part numbers to current aftermarket availability. ↗ 📚 iboats.com — OMC I/O and Inboard Engines forum Active community + sticky threads for common procedures (gear oil change, bellows, shift cable). Search "OMC Cobra 4.3L". ↗

Manual	Part #	Where to get
OMC Cobra Service Manual (1989, 1986-1993)	`0507759`	Sam has physical copy. Online: watercraftmanuals.com, scribd, eBay used.
OMC Cobra Parts Catalog	`0985974`	Crowley Marine, Marine Parts House (free online lookup).
OMC Cobra Owner's Manual	`0985996`	Sam has physical copy.
Clymer OMC Cobra Manual (1986-1993)	Haynes B753	Amazon ~$30-40. Covers 2.3L-7.5L incl. 4.3L. Has wiring diagrams.
Seloc Marine Repair Guide for OMC Cobra (1986-1998)	Seloc 18-03404	Sierra International, Amazon. Newer than Clymer; covers SX successor too.
Four Winns Freedom-series Owner's Manual (1989-era)	n/a	Hull info, not engine. Get the FREEDOM/OMC-era manual — NOT the modern "H series" manual (that's the 2022+ H190, a different boat). SAM-FILL: vintage Four Winns Freedom owner's-manual PDF source.

Known OMC Cobra weak points

Shift cable — corrodes/seizes; common service item
Intermediate housing seal — leaks gear oil into bell housing
Water intake design — debris-prone, watch for overheating
Bellows — drive bellows degrade ~5-7 years, inspect annually
Trim limit switch — failure-prone after high cycles

None are blockers right now. Watch list for future service.

Parts sources (post-OMC bankruptcy)

Aftermarket	SEI Marine, Sierra Marine, GLM Marine, CDI Electronics
NOS / used	iboats.com, Crowley Marine, eBay marine
GM block parts	4.3L V6 long-block uses standard GM automotive parts — gaskets, bearings, pistons, etc.

Body & consumables (bimini, side vents, battery sizing)

Bimini bracket clips	Broken. Generic universal bimini pole clips sized by tube diameter (NOT a Four Winns OEM part). Common 7/8" or 1" tube; ~$10 / 4-pack. SAM-FILL: measure a bimini bow/tube diameter (7/8" vs 1") before ordering. Priority: low.
Side vent covers	Cracked plastic louvered vents. Generic marine louvered vent sized to the cutout (~$15-30) OR Four Winns OEM via Boat Outfitters (boatoutfitters.com). SAM-FILL: vent cutout dimensions + louvered-vs-solid (measure/photo), then pick generic vs OEM. Priority: low.
Cranking battery (sizing)	Marine dual-purpose Group 24 or 27, ~650+ CCA / 800+ MCA (Gp 27 = more capacity if the tray fits; Gp 24 = lighter/cheaper). Gp 31 = overkill for a 4.3L runabout. OMC Cobra 4.3 manual minimum ~375 CCA / 475 MCA / 90 Ah (verify); practical floor ~550 CCA. Installed this season: SuperStart 24DCM (see Battery tab). SAM-FILL: battery tray/box dimensions (Gp 24 vs 27 fit); flooded vs AGM.

Sources (added 2026-06-02, merged from the archived v0.1 field notes): bimini pole clips ~$10/4-pack (7/8"/1") via eBay/Amazon generic listings; side vents generic marine vent or Four Winns OEM via boatoutfitters.com; battery minimums per OMC Cobra 4.3 owner's manual; local marine-battery pricing Walmart EverStart / O'Reilly Super Start / AutoZone Duralast.

Service log

Newest first. Update this tab when work completes.

2026-06-05 · doc

Consolidated to canonical /equipment/ home

Merged the newer source-cited sections from the old guides/ v0.1 field-notes draft into this hub: outdrive gear-lube cost-choice + monitor-bottle note (2026-06-01) and Body & Consumables (bimini clips, side vents, battery sizing, 2026-06-02). The v0.1 draft is archived at /archive/fourwinns-guide-v0.1-2026-06-05/.

2026-05-25 · pending

Spring commissioning planned

Five tasks queued. See task tabs for procedures.

~Oct 2025 · complete

Fall 2025 winterization

Per owner's manual: coolant tubes disconnected, petcocks opened, outdrive gear oil drained. Boat parked on trailer in driveway.

2026-04-28 · complete

Battery failure diagnosed (DHL-001)

NAPA 7575 Group 75 found at 3V terminal voltage after winter storage. Smart charger refused to engage. H1 (sulfated, unrecoverable) converged. Contributing factors: wrong group for marine duty, 7.8 yr age at time of failure, parasitic draw during winter storage (root cause).

~Jun 2018 · historical

NAPA 7575 battery installed

Date code on case: JU/8 = June 2018. Wrong group size for marine application — should have been Group 24M or 27M.

Future log entries

As work completes, add timeline entries. Format: date · status, title, brief detail.