Thermostat Kit – Fits Volvo Penta AQ165/AQ170/BB165/BB170 Marine Engines (Replaces 875791, 831040)
Thermostat Kit – Fits Volvo Penta AQ165/AQ170/BB165/BB170 Marine Engines (Replaces 875791, 831040) is backordered and will ship as soon as it is back in stock.
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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 AQ165/AQ170/BB165/BB170 Marine En...
Product Details
This Thermostat Kit – Fits Volvo Penta AQ165/AQ170/BB165/BB170 Marine Engines is designed for specific Volvo Penta gasoline engine models manufactured between 1965 and 1978, including the AQ165A, AQ170 (A, B, C), BB165A, and BB170 (A, B, C) series. It ensures your engine maintains the correct operating temperature for optimal performance and fuel efficiency.
This kit serves as a direct replacement for Volvo Penta OEM part numbers 875791 and 831040.
- Engineered for direct-fit installation.
- Designed specifically for gasoline marine engines.
- Regulates engine temperature at a preset 55°C (131°F).
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Volvo Penta | 875791 |
| Volvo Penta | 831040 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
| Brand | Model | Years | OEM Part No. |
|---|---|---|---|
| Volvo Penta | AQ165A | 1968–1969 | 875791, 831040 |
| Volvo Penta | AQ170A, BB170A | 1969–1972 | 875791, 831040 |
| Volvo Penta | AQ170B, BB170B | 1972–1973 | 875791, 831040 |
| Volvo Penta | AQ170C, BB170C | 1973–1978 | 875791, 831040 |
| Volvo Penta | BB165A | 1965–1969 | 875791, 831040 |
Technical Specs
- Product Type
- Thermostat Kit
- Installation
- Direct replacement
- Fuel Type
- Gasoline
- Dimensions
- 15.0 x 10.0 x 5.5
- Weight
- ~50g (1.76 oz)
- Operating Temperature
- 55°C (131°F)
- Warranty
- 30-day replacement/refund (varies by seller)
What’s in the Box
- 1 x Thermostat Service Kit (875791, 831040)
Installation Notes
- Ensure the engine is completely cool before beginning work.
- Drain the engine coolant to a level below the thermostat housing.
- Carefully remove the bolts securing the thermostat housing cover.
- Note the orientation of the old thermostat before removing it from the housing.
- Thoroughly clean the mating surfaces of the housing and its cover to remove any old gasket material or sealant.
- Install the new thermostat and gasket, ensuring it is seated in the correct orientation.
- Replace the housing cover and tighten the bolts to the manufacturer's specified torque.
- Refill the cooling system with the correct type and amount of coolant.
- Start the engine, allow it to reach operating temperature, and carefully check for any leaks around the housing.
Troubleshooting & FAQ
How do I know if my thermostat has failed?
Common signs of a faulty thermostat include engine overheating, the engine not reaching its normal operating temperature, or erratic fluctuations on the temperature gauge.
Is this the correct temperature rating for my engine?
This is a 55°C (131°F) thermostat. While it fits the listed models, always confirm your engine's specific temperature requirement as specified in your owner's manual. Using the wrong temperature can impact performance.
What is the recommended replacement interval?
Thermostats are a critical maintenance component. To prevent cooling system failures, it is recommended to inspect them regularly and replace them every few years, or according to the service schedule in your engine's manual.
Can I install this part myself?
Installation can be performed by individuals with mechanical experience. However, to ensure a leak-free seal and proper cooling system function, professional installation is recommended.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost?
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns?
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs 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 QC.
Payment & Security
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