Thermostat Kit 180°F (82°C) – Fits Volvo Penta 110-167 HP Sterndrive (Replaces 875580, 18-3666)

Thermostat Kit 180°F (82°C) – Fits Volvo Penta 110-167 HP Sterndrive (Replaces 875580, 18-3666)

This aftermarket thermostat kit is engineered to fit a wide range of Volvo Penta sterndrive engines from 110 HP to 167 HP, primarily those manufactured between 1975-1993. It ensures your engine maintains the correct operating temperature of 180°F (82°C) for optimal performance and longevity.

This kit is a direct replacement for Volvo Penta 875580, Sierra 18-3666, and Mallory 9-43010.

• Maintains engine temperature at 180°F (82°C).
• Includes thermostat and required seal ring/gasket for a complete installation.
• Designed as a direct-fit replacement for easy installation.

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 Volvo Penta 875580)
• 1 x Seal Ring/Gasket

Installation Guide

1. Safety First: Ensure the engine is completely cool before beginning. Disconnect the battery.
2. Locate Housing: Find the thermostat housing, typically connected to the main coolant hose on the engine block.
3. Drain Coolant: Place a container underneath and partially drain the coolant below the thermostat housing level.
4. Remove Housing: Loosen and remove the bolts securing the housing cover. Note their positions if they are different lengths.
5. Extract Old Thermostat: Carefully lift the housing cover. The old thermostat and its gasket should be visible. Remove both.
6. Clean Surfaces: Thoroughly clean the mating surfaces of the housing and its cover, removing all old gasket material and corrosion.
7. Install New Parts: Place the new thermostat into the housing, ensuring it is correctly oriented. Position the new gasket on top.
8. Reassemble: Re-place the housing cover and tighten the bolts evenly to the manufacturer's recommended torque. Do not overtighten.
9. Refill Coolant: Top off the coolant you drained earlier and check for leaks.
10. Test: Reconnect the battery. Start the engine and let it warm up, visually inspecting the housing for any signs of leakage.

Troubleshooting & FAQ

Q: How do I confirm this thermostat fits my engine?

A: The best method is to compare the part numbers listed (Volvo Penta 875580, Sierra 18-3666, Mallory 9-43010) with your existing part or service manual. You can also use the compatible engine models table on this page to check your specific model, HP, and year range.

Q: What are the signs of a failing thermostat?

A: Common symptoms include engine overheating (staying hot) or running too cold (not reaching operating temperature). You may see corresponding warnings on your dashboard gauges. A thermostat stuck open will prevent the engine from warming up, while one stuck closed will cause it to overheat quickly.

Q: What is the operating temperature of this thermostat?

A: This thermostat is rated to maintain an engine operating temperature of 180°F (82°C), which is the standard specification for the listed Volvo Penta models.

Q: Is this an OEM part?

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.