Thermostat Kit – Fits Volvo Penta V6 & V8 Marine Engines (Replaces 876305, 875794)
Thermostat Kit – Fits Volvo Penta V6 & V8 Marine Engines (Replaces 876305, 875794) is backordered and will ship as soon as it is back in stock.
Couldn't load pickup availability
Worry-free returns
Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Thermostat Kit – Fits Volvo Penta V6 & V8 Marine Engines (Repla...
Product Details
This Thermostat Kit – Fits Volvo Penta V6 & V8 Marine Engines is a complete replacement assembly for a wide range of raw water cooled engines produced between 1973 and 1993, including models from 170 to 307 HP. It ensures your engine maintains the correct operating temperature for optimal performance and longevity.
This kit provides a direct interchange for Volvo Penta part numbers 876305 and 875794-4, as well as aftermarket equivalents Sierra 18-3662, GLM 13381, and Mallory 9-43004.
- Designed for installation in raw water (open) cooling systems.
- Features a thermostat rated for 144°F/145°F (62°C).
- Includes all necessary gaskets and a sealing ring for a leak-free installation.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Volvo Penta | 876305 |
| Volvo Penta | 875794-4 |
| Sierra | 18-3662 |
| GLM | 13381 |
| Mallory | 9-43004 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This kit is designed for the Volvo Penta raw water cooled V6 and V8 models listed, covering production years from 1973 to 1993.
| Brand | Model | Rated HP | Years | OEM Part No. |
|---|---|---|---|---|
| Volvo Penta | AQ175A | 170 | 1981–1985 | 876305 |
| Volvo Penta | AQ190A | 182 | 1976–1977 | 876305 |
| Volvo Penta | AQ200B, AQ200C, AQ200D, AQ200F | 200 | 1977–1986 | 876305 |
| Volvo Penta | AQ205A | 205 | 1988–1989 | 876305 |
| Volvo Penta | AQ211A | 210 | 1986–1989 | 876305 |
| Volvo Penta | AQ225B, AQ225C, AQ225D, AQ225E, AQ225F | 225 | 1977–1986 | 876305 |
| Volvo Penta | AQ231A, AQ231B | 229 | 1986–1989 | 876305 |
| Volvo Penta | AQ240A | 225 | 1976–1977 | 876305 |
| Volvo Penta | AQ255A, AQ255B | 876305 | ||
| Volvo Penta | AQ260A, AQ260B | 260 | 1979–1986 | 876305 |
| Volvo Penta | AQ271A, AQ271B | 270 | 1986 | 876305 |
| Volvo Penta | AQ271C, AQ271D | 275 | 1986–1989 | 876305 |
| Volvo Penta | AQ280A | 876305 | ||
| Volvo Penta | AQ290A | 290 | 1979–1985 | 876305 |
| Volvo Penta | AQ311A, AQ311B | 307 | 1986–1989 | 876305 |
| Volvo Penta | BB140A | 125 | 1975–1979 | 876305 |
| Volvo Penta | BB225A, BB225AV | 225 | 1973–1974 | 876305 |
| Volvo Penta | BB225B | 225 | 1974–1976 | 876305 |
| Volvo Penta | BB225C | 225 | 1976–1977 | 876305 |
| Volvo Penta | BB231A | 229 | 1987 | 876305 |
| Volvo Penta | BB260A, BB260AV | 260 | 1978–1985 | 876305 |
| Volvo Penta | BB260B, BB260C | 260 | 1985–1987 | 876305 |
| Volvo Penta | BB261A | 270 | 1988–1989 | 876305 |
| Volvo Penta | 430A | 205 | 1990–1991 | 876305 |
| Volvo Penta | 430B | 205 | 1991–1992 | 876305 |
| Volvo Penta | 431A | 205 | 1989–1991 | 876305 |
| Volvo Penta | 431B | 205 | 1991–1992 | 876305 |
| Volvo Penta | 432A | 205 | 1992–1993 | 876305 |
| Volvo Penta | 432B | 205 | 876305 | |
| Volvo Penta | 434A | 205 | 1992–1993 | 876305 |
| Volvo Penta | 500A | 210 | 1989–1990 | 876305 |
| Volvo Penta | 500B | 210 | 1990–1993 | 876305 |
| Volvo Penta | 501A | 229 | 1989–1991 | 876305 |
| Volvo Penta | 501B | 229 | 1991–1993 | 876305 |
| Volvo Penta | 570A | 275 | 1989–1993 | 876305 |
| Volvo Penta | 571A | 307 | 1989–1992 | 876305 |
| Volvo Penta | 572A | 270 | 1991–1993 | 876305 |
| Volvo Penta | 740A | 330 | 1989–1992 | 876305 |
| Volvo Penta | 740B | 330 | 1992–1993 | 876305 |
Technical Specs
- Product Type
- Marine Engine Thermostat Kit
- Installation
- Engine Cooling System
- Thermostat Rating
- 144°F/145°F (62°C)
- Engine Cooling Type
- Raw Water (Open) Cooling System
- Dimensions
- 12.0" L x 12.0" W x 12.0" H
What’s in the Box
- 1 x Thermostat (424299)
- 1 x Sealing Ring (416033)
- 1 x Gasket (856004)
- 1 x Gasket (835581)
- 1 x Gasket (835417)
Installation Notes
- Ensure the engine is completely cool and disconnect the negative battery cable for safety.
- Drain the engine block's cooling system to a level below the thermostat housing.
- Carefully remove the bolts from the thermostat housing cover and detach any connected hoses.
- Note the orientation of the existing thermostat before removing it from the housing.
- Thoroughly clean the mating surfaces of both the housing and its cover, removing all old gasket material.
- Install the new thermostat in the same orientation as the original part.
- Position the new gaskets and sealing ring as required for your specific model.
- Re-secure the housing cover, tightening the bolts to the manufacturer's specified torque in a crisscross pattern.
- Reconnect hoses, refill the cooling system with the appropriate coolant, and inspect for any leaks.
- Start the engine and allow it to reach operating temperature, confirming the thermostat opens correctly and there are no leaks.
Troubleshooting & FAQ
How do I know if my thermostat has failed?
Common signs of a faulty thermostat include engine overheating, the engine running too cold and failing to reach its normal operating temperature, or erratic temperature gauge fluctuations.
Is this kit for raw water or closed cooling systems?
This thermostat kit is specifically designed for raw water (or "open") cooling systems common in the listed Volvo Penta engines. It is not intended for use in closed (freshwater) cooling systems.
Why are there multiple gaskets included?
This kit is designed to fit a wide variety of engine models produced over two decades. Different models and years used slightly different housing configurations, so multiple gaskets are included to ensure you have the correct one for your specific application.
What is the purpose of the 144/145°F temperature rating?
This temperature is the point at which the thermostat begins to open, allowing raw water to circulate through the engine block for cooling. This rating is standard for many raw-water cooled marine engines to prevent salt crystallization and ensure efficient operation.
What's the difference between OEM and aftermarket parts?
This listing is for an aftermarket replacement, not an original equipment manufacturer (OEM) part. It has been engineered to meet or exceed OEM-level specifications using comparable materials. All our parts are manufactured in an ISO 9002 certified facility and are batch-inspected for quality and consistency.
How fast is shipping?
We ship worldwide, with most orders arriving within 5–15 days via standard delivery. Standard shipping is free to most regions, and expedited options are available at checkout where applicable.
What is the warranty and return policy?
Our parts are covered by a 1-year warranty against manufacturing defects under normal use conditions. If you encounter an issue, please contact our support team with your order details. Returns are accepted within our standard window for items that are unused and in their original condition. See our full policy page or contact us for instructions.
Safety & Important Info
- Verify images and specifications against your original part before ordering. If anything differs—even if your model appears on the compatibility list—do not purchase.
- This is an aftermarket replacement component, not an OEM part.
- Professional installation is highly recommended for safety, performance, and to prevent engine damage.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and rigorously tested for real-world reliability.
- Fast Global Fulfillment — We offer free standard delivery to most regions, with typical transit times of just 5–15 days.
- Manufacturer-Direct Value — By working directly with manufacturers, we provide fair pricing without compromising on materials or quality control.
Payment & Security
Payment methods
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
