8M0089715 Mercury MerCruiser Thermostat | Genuine Quicksilver OEM Part
8M0089715 Mercury MerCruiser Thermostat | Genuine Quicksilver OEM Part
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🔧 Product Description
Genuine Quicksilver 140°F Marine Engine Thermostat - Part Number: 8M0089715
A genuine Quicksilver marine thermostat calibrated to approximately 140-142°F for selected raw-water-cooled MerCruiser, Crusader, PCM and Chrysler petrol engines.
The thermostat controls cooling-water circulation through the engine, allowing the cylinder block to warm to its intended operating temperature before increasing flow through the cooling system.
⚙️ Key Features
- Genuine Quicksilver OEM marine thermostat
- Correct Mercury part number 8M0089715
- Approximately 140-142°F / 60-61°C opening specification
- Used on selected Ford 302 and 351 CID raw-water-cooled engines
- Cross-references with Sierra, GLM, Mallory, Moeller, Crusader and PCM thermostats
🚤 Compatibility
Commonly used on
- Raw-water-cooled Ford-based MerCruiser, Crusader and Pleasurecraft marine engines
- Selected Chrysler Marine V8 cooling systems
Typically suits
- Engine models:
- MerCruiser 888 Ford 302 CID V8
- MerCruiser 225-S Ford 302 CID V8
- MerCruiser 233 Ford 351 CID V8
- MerCruiser 255 Ford 351 CID V8
- MerCruiser Ford 302 CID raw-water-cooled V8 applications using thermostat 59137
- MerCruiser Ford 351 CID raw-water-cooled V8 applications using thermostat 59137
- Crusader Ford 302 and 351 CID V8 applications using thermostat 96319
- Pleasurecraft Marine Ford 302 and 351 CID V8 applications using thermostat R026002E
- Chrysler Marine V8 Rochester-carburettor applications from approximately 1986 onward using thermostat 4142885
- Engine Type: Ford and Chrysler petrol marine V8
- Thermostat Rating: Approximately 140-142°F / 60-61°C
- Year Range: Approximately 1960s-1990s, dependent on engine and cooling-system configuration
🔌 Function
The thermostat restricts cooling-water flow during warm-up and opens at its calibrated temperature to maintain stable engine operating temperature.
⚠️ Common Signs of Failure
- Engine overheats because the thermostat is stuck closed
- Engine runs excessively cold because the thermostat is stuck open
- Unstable engine temperature
- Corrosion or deposits prevent the valve moving
- Poor warm-up and increased fuel consumption
🔄 Supersession & Cross Reference
OEM Supersession Chain
- 8M0089715 → Supersedes 8072531
- 8072531 → Supersedes 807252T1
- 807252T1 → Supersedes 8072521
- 8072521 → Supersedes 59137A1
- 59137A1 → Supersedes 59137
- 59137 → Related to earlier 35884 and 32728 thermostat references
OEM / Related Numbers
- 8M0089715
- 8072531
- 807252T1
- 8072521
- 59137A1
- 59137
- 35884
- 32728
- Chrysler: 4142885
- Crusader: 96319
- Pleasurecraft: R026002E
Aftermarket / Verified Equivalents
- Sierra: 18-3551
- GLM: 13030
- Mallory: 9-43013
- Moeller: 143-DEG
- Redline: RL3551
- Crusader: 96319
- Pleasurecraft Marine: R026002E
- Chrysler Marine: 4142885
📦 Condition
- Genuine Quicksilver part
- Brand new
- Supplied in original or equivalent packaging
Shipping & Delivery
Shipping & Delivery
Flat-rate shipping Australia-wide — $14.99 per order, no matter how many parts you add. Orders dispatch from our Kadina, South Australia store. Need it urgently or want to collect in person? Call us on 0412 532 984 before ordering.
Returns & Warranty
Returns & Warranty
14-day change-of-mind returns — if it's not right or you ordered the wrong part, send it back within 14 days in new, unused condition for a refund or exchange. Manufacturer warranties apply to new parts. Full details in our Refunds & Returns policy.
Not sure this fits?
Not sure this fits?
Ask us before you buy — we check part numbers and fitment every day. Call 0412 532 984 (Mon–Fri 8.30am–4.30pm) or message us through the contact page with your engine or vehicle details.
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