82°C/180°F Thermostat – Fits Volvo Penta D4 D6 D12 (Replaces 8149182, 1676306, 1544683, 1661277)
82°C/180°F Thermostat – Fits Volvo Penta D4 D6 D12 (Replaces 8149182, 1676306, 1544683, 1661277) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
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82°C/180°F Thermostat – Fits Volvo Penta D4 D6 D12 (Replaces 814918...
Product Details
This 82°C/180°F Thermostat – Fits Volvo Penta D4 D6 D12 Marine Engines (Replaces 8149182, 1676306, 1544683, 1661277) is engineered to maintain optimal engine temperature in Volvo Penta marine diesel engines. It is designed for models in the D4, D6, and D12 series, covering both inboard and sterndrive applications.
This unit serves as a direct replacement for Volvo Penta part numbers 8149182, 1676306, 1544683, 1661277, 1303061, and 11000237, as well as aftermarket equivalents like Sierra 18-3681 and PAI 801162.
- Engineered for direct OEM replacement installation.
- Includes the necessary seal/gasket for a complete installation.
- Maintains a consistent 82°C (180°F) opening temperature.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket brands.
| Brand | Part Number |
|---|---|
| Volvo Penta | 8149182 |
| Volvo Penta | 1676306 |
| Volvo Penta | 1544683 |
| Volvo Penta | 1661277 |
| Volvo Penta | 1303061 |
| Volvo Penta | 11000237 |
| Sierra | 18-3681 |
| PAI | 801162 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This thermostat fits a wide range of Volvo Penta marine diesel engines. Please verify your specific model is listed.
| Brand | Model | Rated HP | Stroke | OEM Part No. |
|---|---|---|---|---|
| Volvo Penta | D4-180I-B/-C/-D/-E/-F | 180 | 4-Stroke | 8149182 |
| Volvo Penta | D4-210A-A/-I-A/-I-B | 210 | 4-Stroke | 8149182 |
| Volvo Penta | D4-225A-C/-D/-E/-F | 225 | 4-Stroke | 8149182 |
| Volvo Penta | D4-225I-B/-C/-D/-E/-F | 225 | 4-Stroke | 8149182 |
| Volvo Penta | D4-260A-A/-B/-C/-D/-E/-F | 260 | 4-Stroke | 8149182 |
| Volvo Penta | D4-260D-B/-C/-D/-E/-F | 260 | 4-Stroke | 8149182 |
| Volvo Penta | D4-260I-A/-B/-C/-D/-E/-F | 260 | 4-Stroke | 8149182 |
| Volvo Penta | D4-300A-A/-C/-D/-E/-F | 300 | 4-Stroke | 8149182 |
| Volvo Penta | D4-300D-A/-C/-D/-E | 300 | 4-Stroke | 8149182 |
| Volvo Penta | D4-300I-A/-C/-D/-E/-F | 300 | 4-Stroke | 8149182 |
| Volvo Penta | D6-280A-A/-B/-C/-D/-E | 280 | 4-Stroke | 8149182 |
| Volvo Penta | D6-280I-A/-B/-C/-D/-E | 280 | 4-Stroke | 8149182 |
| Volvo Penta | D6-300A-F, D6-300D-F (MC) | 300 | 4-Stroke | 8149182 |
| Volvo Penta | D6-300I-F | 300 | 4-Stroke | 8149182 |
| Volvo Penta | D6-310A-A/-B/-C/-D/-E | 310 | 4-Stroke | 8149182 |
| Volvo Penta | D6-310D-B/-C/-D/-E | 310 | 4-Stroke | 8149182 |
| Volvo Penta | D6-310I-A/-B/-C/-D/-E | 310 | 4-Stroke | 8149182 |
| Volvo Penta | D6-330A-B/-C/-D/-E/-F | 330 | 4-Stroke | 8149182 |
| Volvo Penta | D6-330D-B/-C/-D/-E/-F | 330 | 4-Stroke | 8149182 |
| Volvo Penta | D6-330I-B/-C/-D/-E/-F | 330 | 4-Stroke | 8149182 |
| Volvo Penta | D6-350A-A/-B | 350 | 4-Stroke | 8149182 |
| Volvo Penta | D6-370A-B/-C/-D/-E/-F | 370 | 4-Stroke | 8149182 |
| Volvo Penta | D6-370D-B/-C/-D/-E/-F | 370 | 4-Stroke | 8149182 |
| Volvo Penta | D6-370I-A/-B/-C/-D/-E/-F | 370 | 4-Stroke | 8149182 |
| Volvo Penta | D6-400A-E/-F | 400 | 4-Stroke | 8149182 |
| Volvo Penta | D6-435D-A/-C/-D/-E/-F | 435 | 4-Stroke | 8149182 |
| Volvo Penta | D6-435I-A/-C/-D/-E | 435 | 4-Stroke | 8149182 |
| Volvo Penta | D6-435I-SC-F, D6-435I-WJ-F | 435 | 4-Stroke | 8149182 |
| Volvo Penta | D12 Series | 4-Stroke | 8149182 |
Technical Specs
- Product Type
- Engine Coolant Thermostat
- Opening Temperature
- 82°C (180°F)
- Installation
- Direct OEM Replacement
- Fuel Type
- Diesel
- Weight
- Approximately 0.2 kg (0.44 lbs)
- Other Technical Attributes
- Includes seal/gasket
What’s in the Box
- 1 x Thermostat Unit with Seal
Installation Notes
- Ensure the engine is completely cool before starting. Drain the coolant into a suitable container.
- Locate the thermostat housing on the engine and carefully remove the mounting bolts.
- Remove the old thermostat and gasket. Note the orientation of the original thermostat for correct placement of the new one.
- Thoroughly clean the mating surfaces of the thermostat housing and the engine block to remove any old gasket material or corrosion.
- Install the new thermostat and seal/gasket in the correct orientation.
- Re-install the thermostat housing and tighten the bolts to the manufacturer's specified torque.
- Refill the cooling system with the recommended coolant and properly bleed the system to remove any air pockets.
- Start the engine and check for any leaks around the housing as it reaches operating temperature.
Troubleshooting & FAQ
How do I know if my thermostat is failing?
Common signs of a faulty thermostat include engine overheating, the engine not reaching normal operating temperature, erratic temperature gauge readings, and coolant leaks from around the thermostat housing.
Is 82°C the correct temperature for my engine?
This thermostat opens at 82°C (180°F), which is the standard specification for the listed Volvo Penta D4, D6, and D12 models. However, always consult your engine's service manual to confirm the correct temperature rating for your specific application.
Does this part come with a new gasket?
Yes, this thermostat assembly includes the required seal/gasket to ensure a leak-free installation. You should not need to purchase any additional seals.
What is the difference between an OEM and an aftermarket part?
This listing is an aftermarket replacement (not OEM). It's built to OEM-level specifications with comparable materials. Our parts are manufactured in an ISO 9002 certified facility and are batch-inspected for quality and consistency.
How much is shipping and how fast will it arrive?
We ship worldwide quickly—typical transit is 5–15 days. Standard shipping is free; expedited options will appear at checkout where available for your location.
What is the warranty and return policy?
This product is covered by a 1-year warranty against manufacturing defects under normal use. If you encounter any issues, please contact our support team with your order details. Returns are accepted within our standard window for unused items in their original condition. See our full policy page or reach out for instructions.
Safety & Important Info
- Verify images and specifications against your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or quality control.
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