875791 Thermostat for Volvo Penta AQ165A AQ170A AQ170B AQ170C BB165A BB170A BB170B BB170C | JLM Marine

Thermostat for Volvo Penta AQ165A AQ170A AQ170B AQ170C BB165A BB170A BB170B BB170C

This high-quality aftermarket thermostat is engineered to fit Volvo Penta gasoline marine engines, including the AQ165A, AQ170A, AQ170B, AQ170C, BB165A, BB170A, BB170B, and BB170C models. Designed to maintain optimal engine operating temperature at 55°C, this thermostat ensures reliable performance and protection for your marine engine.

This thermostat directly replaces Volvo Penta OEM part numbers 875791 and 831040, providing seamless compatibility and dependable temperature regulation for your gasoline-powered Volvo Penta engine.

• Complete thermostat service kit included
• Maintains optimal engine temperature at 55°C
• Designed for Volvo Penta gasoline marine engines

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Compatible Engine Models

Confirm your engine model/year in the table below.

Technical Specifications

Package Contents

This package includes the following components:

• 1 x Thermostat Service Kit

Installation Guide

1. Allow the engine to cool completely before beginning work. Ensure the cooling system is not under pressure.
2. Drain the coolant from the engine to a level below the thermostat housing. Use a suitable container to collect the coolant.
3. Locate the thermostat housing on your Volvo Penta engine. Remove the retaining bolts or clamps securing the housing cover.
4. Carefully remove the old thermostat and inspect the housing for debris or corrosion. Clean the mating surfaces thoroughly.
5. Install the new thermostat, ensuring it is positioned correctly with the temperature-sensing element facing the engine block. The thermostat should sit flush in its recess.
6. Install the new gasket (if included in the service kit) onto the housing mating surface. Ensure proper alignment to prevent leaks.
7. Reattach the thermostat housing cover and tighten the bolts to the manufacturer's specified torque. Do not overtighten.
8. Refill the cooling system with the appropriate coolant mixture as specified in your engine manual. Check for the correct coolant type and ratio.
9. Bleed air from the cooling system according to your engine's service procedure. This prevents air pockets that can cause overheating.
10. Start the engine and allow it to reach normal operating temperature. Monitor the temperature gauge closely.
11. Inspect all connections for leaks while the engine is running. Check around the thermostat housing and hose clamps.
12. After the engine has cooled, recheck the coolant level and top off if necessary. Verify that the thermostat is opening properly by checking coolant circulation.

Troubleshooting & FAQ

Q: How do I confirm this thermostat fits my Volvo Penta engine?
A: Check the compatible engine models table above to verify your engine model (AQ165A, AQ170A/B/C, BB165A, BB170A/B/C). Cross-reference the OEM part numbers 875791 or 831040 with your engine's parts manual or the existing thermostat on your engine.

Q: What are the signs that my thermostat needs replacement?
A: Common symptoms include engine overheating, failure to reach normal operating temperature, fluctuating temperature gauge readings, or coolant leaks around the thermostat housing. If the engine takes too long to warm up or runs hotter than normal, the thermostat may be stuck open or closed.

Q: How often should I replace the thermostat on my Volvo Penta engine?
A: Thermostats should be inspected regularly and replaced every 2-3 years or as recommended in your engine's maintenance schedule. Replace immediately if you notice any cooling system issues or if the thermostat shows signs of corrosion or damage during routine maintenance.

Q: Can I reuse the old gasket during installation?
A: No, always use a new gasket to ensure a proper seal and prevent coolant leaks. The service kit includes a new gasket for this purpose.

Q: What is the difference between this aftermarket thermostat and the OEM version?
A: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.

Q: How fast do you ship and how much does it cost?
A: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.

Q: What is your warranty and return policy?
A: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.

Important Notes

• Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
• This product is an aftermarket replacement part and is not an OEM component.
• Professional installation is recommended to ensure safety and optimal performance.

Why Choose JLM MARINE?

• Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
• Fast Global Shipping: Free delivery worldwide in 5–15 days.
• Direct from Manufacturer: Competitive pricing without compromising quality.