Thermostat Housing Gasket – Fits Volvo Penta Marine Engines (Replaces 840385)
Thermostat Housing Gasket – Fits Volvo Penta Marine Engines (Replaces 840385) 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 Housing Gasket – Fits Volvo Penta Marine Engines (Replac...
Product Details
This genuine Thermostat Housing Gasket – Fits Volvo Penta Marine Engines (Replaces 840385) is designed for various Volvo Penta marine engines. It creates a reliable seal to prevent leaks and unwanted substances from entering the boat's engine while providing essential cushioning between engine surfaces.
This part is a direct replacement for Volvo Penta references 840385 and REC840385.
- Installs as a direct replacement for the original part.
- Constructed from high-quality, durable, non-corrosive housing material.
- Engineered to prevent leaks and cushion critical engine components.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Notes |
|---|---|---|
| Volvo Penta | 840385 | Thermostat housing gasket |
| Volvo Penta | REC840385 | Thermostat housing gasket |
Technical Specs
- Product Type
- Thermostat Housing Gasket
- Installation
- Direct replacement
- Fuel Type
- Gasoline/Diesel
- Housing Material
- High-quality, durable, non-corrosive material
- Dimensions
- 11.6 in L x 10.3 in W x 0.1 in H
- Weight
- 0.036 kg (0.08 lbs)
- Other Technical Attributes
- Prevents leaks and unwanted substances; provides cushioning between engine surfaces
What’s in the Box
- 1 x Thermostat Housing Gasket (840385/REC840385)
Installation Notes
- Ensure the engine is cool and disconnect the battery before starting work.
- Carefully drain the engine coolant into an appropriate container.
- Remove the bolts securing the thermostat housing and carefully detach the housing.
- Remove the old gasket and thoroughly clean all mating surfaces, ensuring they are free of debris and old sealant.
- Position the new gasket correctly onto the engine block or housing.
- Reattach the thermostat housing and tighten the bolts to the manufacturer’s specified torque settings.
- Refill the cooling system with the recommended coolant.
- Reconnect the battery, start the engine, and inspect for any leaks as it warms to operating temperature.
Troubleshooting & FAQ
How do I confirm this gasket fits my engine?
This gasket replaces Volvo Penta part number 840385. The most reliable method to ensure correct fitment is to match this part number with the one listed in your engine's service manual or to visually compare the new part with your old one before installation.
What are the signs of a faulty thermostat housing gasket?
Symptoms of a failing gasket include visible coolant leaks around the thermostat housing area, engine overheating, an unexplained drop in coolant levels, or the smell of antifreeze from the engine bay.
Is any sealant required when installing this gasket?
This gasket is typically designed to be installed dry. However, always refer to your specific engine's service manual, as some applications may recommend a light application of a particular type of sealant.
Is this an OEM or aftermarket part?
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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