Thermostat Kit – Fits Volvo Penta KAD32/42/43/44, AD31/41, TAMD41/42 Marine Diesel Engines (Replaces 3831424)

Thermostat Kit – Fits Volvo Penta KAD32/42/43/44, AD31/41, TAMD41/42 Marine Diesel Engines (Replaces 3831424)

This thermostat kit is engineered for a wide range of Volvo Penta marine diesel engines, including the 31, 32, 41, 42, 43, and 44 series (KAD, KAMD, AD, TAMD, and TMD variants). It is designed to maintain a precise operating temperature of 82°C (179.6°F) for optimal engine performance and longevity.

This part is a direct replacement for Volvo Penta part numbers 3831424, 273952, 467015, 876128, 875849, and 1544390, as well as Sierra 18-3538.

• Operating Temperature: 82°C (179.6°F)
• Installation Method: Direct OE Replacement
• Important Note: Two thermostat units are required per engine for most applications.

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 3831424)

Installation Guide

1. Ensure the engine is completely cool before beginning work.
2. Drain the engine coolant to a level below the thermostat housing.
3. Carefully remove the thermostat housing cover. Note the orientation of the old thermostat before removal.
4. Lift out the old thermostat and remove the old gasket or sealing ring.
5. Thoroughly clean the mating surfaces of the thermostat housing and its cover.
6. Install the new thermostat, ensuring it is seated in the correct direction.
7. Place the new gasket or seal and re-attach the housing cover. Tighten the bolts to the manufacturer's specified torque.
8. Refill the cooling system with the manufacturer-recommended coolant.
9. Start the engine, allow it to warm up, and carefully check for any coolant leaks around the housing.

Troubleshooting & FAQ

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

A: This thermostat is designed for a wide range of Volvo Penta diesel engines in the 31, 32, 41, 42, 43, and 44 series. To confirm compatibility, please find your engine model in the "Compatible Engine Models" table above and verify that the OEM part number matches 3831424.

Q: How many thermostats do I need for my engine?

A: For most listed Volvo Penta engines, two thermostats are required for a complete replacement. We recommend checking your engine's service manual to confirm the exact quantity needed.

Q: What are the common signs of a failing thermostat?

A: Symptoms of a faulty thermostat include the engine overheating, the engine failing to reach its normal operating temperature, erratic temperature gauge readings, and potential coolant leaks from the thermostat housing area.

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.