Thermostat Kit – Fits Volvo Penta 3.0-8.1L Engines (Replaces 3587597, 3852111, 3852071)

Thermostat Kit – Fits Volvo Penta 3.0-8.1L Engines (Replaces 3587597, 3852111, 3852071)

This thermostat kit is designed for a wide range of Volvo Penta 3.0L, 4.3L, 5.0L, 5.7L, and 8.1L marine engines manufactured from 2002 and up. It provides a reliable solution for maintaining optimal engine operating temperature.

It serves as a direct replacement for Volvo Penta 3587597, Sierra 18-3618, Sierra 18-3615, and Sierra 18-2917, ensuring broad compatibility with specified models.

• Includes a 150°F (65.6°C) thermostat for correct engine performance.
• Comes complete with the necessary gasket and O-ring seals for a full replacement.
• Engineered for direct-fit installation on gasoline 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 kit includes all necessary components for a complete thermostat replacement:

• 1 x Thermostat (3587597)
• 1 x Gasket (3852111)
• 1 x O-ring (3852071)

Installation Guide

1. Ensure the engine is completely cool. Safety first: disconnect the battery before starting.
2. Locate the thermostat housing on the engine, typically where the main coolant hose connects from the heat exchanger or raw water pump.
3. Place a drain pan underneath the housing to catch any spilled coolant.
4. Carefully unbolt and remove the thermostat housing cover. Note the orientation of the old thermostat.
5. Remove the old thermostat, gasket, and O-ring seal from the housing.
6. Thoroughly clean the mating surfaces of the housing and engine block to remove any old gasket material or corrosion.
7. Place the new O-ring onto the new thermostat.
8. Install the new thermostat into the housing, ensuring it is seated in the correct orientation.
9. Position the new gasket onto the housing surface.
10. Re-install the housing cover and tighten the bolts to the manufacturer's recommended torque specifications. Do not overtighten.
11. Reconnect the main coolant hose and any other disconnected components. Reconnect the battery.
12. Refill the cooling system with the appropriate coolant, then start the engine and carefully check for any leaks around the housing.

Troubleshooting & FAQ

How do I confirm this thermostat kit will fit my engine?
This kit is designed for Volvo Penta 3.0L, 4.3L, 5.0L, 5.7L, and 8.1L engines made from 2002 onwards that require a 150°F thermostat. To ensure a perfect match, please check your engine model against the "Compatible Engine Models" table above and verify that your existing part number corresponds to one of the numbers listed in the "Part Number Cross-Reference" section, such as the OEM part 3587597.

What are the signs of a failing thermostat?
Common signs include the engine overheating (temperature gauge in the red), the engine not reaching normal operating temperature (gauge stays too low), or erratic and sudden fluctuations in the temperature gauge reading. A faulty thermostat can lead to poor engine performance, increased fuel consumption, and potential engine damage.

Is this a 150°F or a different temperature thermostat?
This kit includes a 150°F (65.6°C) thermostat. This is the specified temperature for the compatible Volvo Penta models listed, ensuring the engine warms up correctly and maintains optimal temperature for efficiency and longevity. Using the wrong temperature can negatively affect performance.

OEM vs. Aftermarket?
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.

How fast do you ship and how much does it cost?
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.

What is your warranty and return policy?
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.