8M0228411 Mercury MerCruiser Thermostat | Genuine Quicksilver OEM Part
8M0228411 Mercury MerCruiser Thermostat | Genuine Quicksilver OEM Part
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🔧 Product Description
Genuine Quicksilver Small-Outboard Thermostat - Part Number: 8M0228411
A genuine Quicksilver thermostat for selected Mercury and Mariner 6HP to 18HP two-cylinder outboards.
The thermostat controls cooling-water flow through the cylinder block, allowing the engine to warm correctly before opening to maintain its designed operating temperature.
⚙️ Key Features
- Genuine Quicksilver OEM thermostat
- Correct current Mercury part number 8M0228411
- Supersedes earlier thermostat 803665
- Used on selected two-cylinder international outboards
- Recmar and Tohatsu replacement references available
🚤 Compatibility
Commonly used on
- Mercury and Mariner two-cylinder international outboard cooling systems
- Corresponding Tohatsu-manufactured thermostat applications
Typically suits
- Engine models:
- Mercury / Mariner 6HP 2-cylinder - serial 0N027903 to 0N055109
- Mercury / Mariner 6HP 2-cylinder - serial 0N055110 and above
- Mercury / Mariner 8HP 2-cylinder - serial 0N027903 to 0N055109
- Mercury / Mariner 8HP 2-cylinder - serial 0N055110 and above
- Mercury 8HP SeaPro - serial 0N014717 to 0N055109
- Mercury 8HP SeaPro - serial 0N055110 and above
- Mercury / Mariner 9.8HP 2-cylinder - serial 0N007788 to 0N055109
- Mercury 9.8HP SeaPro - serial 0N055110 and above
- Mercury / Mariner 9.9HP 2-cylinder - serial 0N059858 and above
- Mercury / Mariner 9.9HP 2-cylinder - serial 0N260037 and above
- Mercury / Mariner 15HP 2-cylinder - serial 0N001590 to 0N055284
- Mercury / Mariner 15HP 2-cylinder - serial 0N055285 and above
- Mercury / Mariner 18HP 2-cylinder - serial 0N001590 to 0N055284
- Mercury / Mariner 18HP 2-cylinder - serial 0N055285 and above
- HP Range: 6HP - 18HP
- Engine Type: Mercury / Mariner two-cylinder carburetted outboard
- Year Range: Serial-number controlled international production
🔌 Function
The thermostat restricts cooling flow during warm-up and opens at its calibrated temperature to maintain stable engine temperature.
⚠️ Common Signs of Failure
- Engine overheats because the thermostat remains closed
- Engine runs too cold because the thermostat remains open
- Poor idle during warm-up
- Heavy corrosion or salt deposits
- Irregular cylinder-block temperature
🔄 Supersession & Cross Reference
OEM Supersession Chain
- 8M0228411 → Supersedes 803665
- 803665 earlier OEM thermostat reference
OEM / Related Numbers
- 8M0228411
- 803665
- 853704
- 804540
- Tohatsu: 350-01030-0
- Tohatsu: 350-01030-1
- Tohatsu: 350-01030-2
Aftermarket / Verified Equivalents
- Recmar: REC804540
- Tohatsu / Nissan Marine: 350-01030-2
- Sierra: 18-3638
📦 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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