Thermostat Kit 140°F / 60°C – Fits Volvo Penta Marine Engines (Replaces 875796)

Thermostat Kit 140°F / 60°C – Fits Volvo Penta Marine Engines (Replaces 875796)

This thermostat kit is engineered for a wide range of Volvo Penta marine engines, ensuring proper engine operating temperature. It is suitable for gasoline models including the AQ120B, AQ125A, AQ140A, BB140A, and 2.5L–3.0L engines (1978–1994). It also fits diesel engines such as the MD6A, MD6B, MD7A, MD7B, and MD67C (1975–1993).

This kit is a direct replacement for multiple OEM and aftermarket part numbers, including Volvo Penta 875796, Sierra 18-3665, and Recmar 875796. It also supersedes earlier Volvo Penta parts 833366 and 829812, providing a reliable update for older systems.

• Regulates engine temperature at a 60°C (140°F) opening temperature.
• Comes complete with a new thermostat, seal ring, and O-ring for a full replacement.
• Manufactured in an ISO9002-certified facility for consistent quality and performance.

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

• 1 x Thermostat (Replaces 875796)
• 1 x Seal Ring (Replaces 416033)
• 1 x O-ring (Replaces 955989)

Installation Guide

1. Ensure the engine is completely cool and disconnect the negative battery terminal for safety.
2. Place a suitable container under the engine and drain the coolant by opening the drain plugs on the engine block and manifold.
3. Locate the thermostat housing, typically where the large coolant hose from the heat exchanger connects to the engine.
4. Loosen the hose clamp and carefully remove the coolant hose from the housing cover.
5. Remove the bolts holding the thermostat housing cover in place. Note their lengths and positions if they are different.
6. Gently tap the cover to break the seal and lift it off. Clean any old gasket material or sealant from both the cover and housing mating surfaces.
7. Take note of the old thermostat's orientation before removing it from the housing.
8. Insert the new thermostat, ensuring it is seated in the same orientation as the original.
9. Install the new O-ring and/or seal ring into their designated grooves, ensuring they are properly seated.
10. Reinstall the housing cover and tighten the bolts evenly in a crossing pattern to the manufacturer's specified torque.
11. Reattach the coolant hose, secure the clamp, and close all coolant drain plugs.
12. Refill the cooling system with the appropriate coolant, run the engine, and carefully check for any leaks around the housing.

Troubleshooting & FAQ

Q: How do I confirm this thermostat kit will fit my engine?
A: Start by checking the "Compatible Engine Models" table on this page. For absolute certainty, cross-reference your existing thermostat's part number with the numbers listed in our "Part Number Cross-Reference" table. Matching the OEM part number is the most reliable way to guarantee fitment.

Q: What are the common signs of a failing thermostat?
A: A faulty thermostat can cause several issues. The most common signs include engine overheating at cruising speeds (stuck closed), the engine not reaching normal operating temperature (stuck open), or erratic temperature gauge readings.

Q: How often should I replace my engine's thermostat?
A: While there is no fixed interval, it is good practice to replace the thermostat as part of routine cooling system maintenance, roughly every 3-5 years or whenever you replace the coolant. It should be replaced immediately if you notice any signs of failure.

Q: OEM vs. Aftermarket?
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.