Thermostat Kit – Fits Volvo Penta 4.3L, 5.0L, 5.7L, 8.1L V6/V8 (Replaces 3831426)
Thermostat Kit – Fits Volvo Penta 4.3L, 5.0L, 5.7L, 8.1L V6/V8 (Replaces 3831426) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Thermostat Kit – Fits Volvo Penta 4.3L, 5.0L, 5.7L, 8.1L V6/V8 (Rep...
Product Details
This Thermostat Kit – Fits Volvo Penta 4.3L, 5.0L, 5.7L, 8.1L Engines (Replaces 3831426) is engineered for a precise fit on a range of Volvo Penta marine engines from 2001–2009. It is designed for V6 and V8 models, including the Gi, GXi, OSi, OSXi, and other designated series, ensuring reliable engine temperature regulation.
This kit serves as a direct replacement for Volvo Penta part number 3831426.
- Engineered for direct replacement and easy installation.
- Rated for a stock 160°F (71°C) operating temperature.
- Features an integrated rubber gasket to ensure a leak-free seal.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Volvo Penta | 3831426 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This part is designed for the following Volvo Penta engine models manufactured between 2001 and 2009.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Volvo Penta | 4.3Gi-200-R | 200 | 4-Stroke | 2001–2009 | 3831426 | Freshwater cooling |
| Volvo Penta | 4.3GIPBYCCE, 4.3GIPNCACE, 4.3GiJWTR | 4-Stroke | 2001–2009 | 3831426 | Gi series | |
| Volvo Penta | 4.3GXi-225-R, 4.3GXi-A, 4.3GXi-B, 4.3GXi-CF | 225 | 4-Stroke | 2001–2009 | 3831426 | GXi series |
| Volvo Penta | 4.3OSi-GF, 4.3OSi-J, 4.3OSi-EF | 4-Stroke | 2001–2009 | 3831426 | OSi series | |
| Volvo Penta | 4.3GL-A, 4.3GL-B, 4.3GLPMDA, 4.3GLPWTR | 4-Stroke | 2001–2009 | 3831426 | GL series | |
| Volvo Penta | 5.0GXi-270-R, 5.0GXi-A, 5.0GXi-BF, 5.0GXi-JF | 270 | 4-Stroke | 2001–2009 | 3831426 | GXi series |
| Volvo Penta | 5.0OSi-DF, 5.0OSi-E, 5.0OSi-FF | 4-Stroke | 2001–2009 | 3831426 | OSi series | |
| Volvo Penta | 5.0FiPHUECE, 5.0FiPNCSCE, 5.0FLPHUE | 4-Stroke | 2001–2009 | 3831426 | Fi series | |
| Volvo Penta | 5.7Gi-300-J, 5.7Gi-DF, 5.7GiE-300-KF | 300 | 4-Stroke | 2001–2009 | 3831426 | Gi series |
| Volvo Penta | 5.7GXi-320-R, 5.7GXi-CF, 5.7GXiE-MF | 320 | 4-Stroke | 2001–2009 | 3831426 | GXi series |
| Volvo Penta | 5.7OSXi-D, 5.7OSXi-DF, 5.7OSXi-JF | 4-Stroke | 2001–2003 | 3831426 | OSXi series | |
| Volvo Penta | V6-200-A, V6-225-A | 200–225 | 4-Stroke | 2001–2009 | 3831426 | V6 series |
| Volvo Penta | V8-300-A, V8-320-E-B, V8-270-E-A | 270–320 | 4-Stroke | 2001–2009 | 3831426 | V8 series |
| Volvo Penta | 8.1Gi-B, 8.1GXi-CF | 4-Stroke | 2001–2009 | 3831426 | 8.1L engines | |
| Volvo Penta | DPX420-CF, DPX420-DF, DPX375-A, DPX385XEFS | 375–420 | 4-Stroke | 2001–2009 | 3831426 | DPX series |
| Volvo Penta | TAMD122A, TAMD122P-A, TAMD122P-C | 4-Stroke | 3831426 | TAMD series |
Technical Specs
- Product Type
- Thermostat Kit
- Installation
- Direct replacement
- Fuel Type
- Gasoline/Petrol
- Temperature Rating
- 160°F (71°C)
- Other Technical Attributes
- Integrated rubber gasket for leak-free operation
- Warranty
- Standard manufacturer warranty
What’s in the Box
- 1 × 160°F Thermostat with integrated rubber gasket (3831426)
Installation Notes
- Ensure the engine is cool and disconnect the battery.
- Drain the engine coolant to a level below the thermostat housing.
- Loosen the hose clamps and remove the coolant hoses from the thermostat housing.
- Remove the bolts securing the housing to the engine and lift it off. Note the orientation of the old thermostat.
- Clean any gasket residue from both the housing and the engine block mating surfaces.
- Install the new thermostat with its integrated gasket, making sure it is seated correctly in the housing.
- Reattach the housing and tighten the bolts to the manufacturer's specified torque.
- Reconnect the coolant hoses and secure the clamps.
- Refill the cooling system with the appropriate coolant mixture.
- Reconnect the battery, start the engine, and check for any leaks as it warms up to operating temperature.
Troubleshooting & FAQ
How do I know if my thermostat is failing?
Common symptoms of a faulty thermostat include engine overheating, running colder than normal, erratic temperature gauge readings, poor engine performance, or visible coolant leaks from the thermostat housing area.
What is the operating temperature of this thermostat?
This thermostat is rated to open at 160°F (71°C), which is the standard factory specification for the compatible Volvo Penta engines to ensure optimal performance and efficiency.
Does this kit include the necessary gasket?
Yes, this thermostat features an integrated rubber gasket, providing a complete seal and eliminating the need to purchase a separate gasket.
Will this fit my Volvo Penta engine if the year is outside the 2001–2009 range?
This kit is specifically listed for models within the 2001–2009 year range. While it may fit other years, we strongly recommend verifying the OEM part number (3831426) in your engine's service manual to guarantee compatibility.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost?
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns?
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
Payment & Security
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