Thermostat Housing Gasket – Fits Volvo Penta 40 Series Marine Diesel Engines (Replaces 859061, 842669)
Thermostat Housing Gasket – Fits Volvo Penta 40 Series Marine Diesel Engines (Replaces 859061, 842669) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
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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 40 Series Marine Diese...
Product Details
This high-quality Thermostat Housing Gasket – Fits Volvo Penta 40 Series Marine Diesel Engines provides a reliable seal for the thermostat housing and heat exchanger connection. It is engineered to fit a range of Volvo Penta 40 Series marine engines, including the MD40A, TMD40A, TMD40B, TMD40C, AQD40A, AQAD40A, AQAD40B, TAMD40A, and TAMD40B models.
This gasket serves as a direct replacement for Volvo Penta part numbers 859061 and 842669, ensuring proper fit and function.
- Designed for direct replacement of the original gasket.
- Made from heat-resistant composite material for durability in marine environments.
- Engineered for use with diesel-fueled engines.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Notes |
|---|---|---|
| Volvo Penta | 842669 | Superseded by 859061 |
| Volvo Penta | 859061 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Volvo Penta engines, verify your specific model from this list to ensure correct gasket fitment.
| Brand | Model | Stroke | OEM Part No. |
|---|---|---|---|
| Volvo Penta | MD40A | 4-Stroke | 859061, 842669 |
| Volvo Penta | TMD40A | 4-Stroke | 859061, 842669 |
| Volvo Penta | TMD40B | 4-Stroke | 859061, 842669 |
| Volvo Penta | TMD40C | 4-Stroke | 859061, 842669 |
| Volvo Penta | AQD40A | 4-Stroke | 859061, 842669 |
| Volvo Penta | AQAD40A | 4-Stroke | 859061, 842669 |
| Volvo Penta | AQAD40B | 4-Stroke | 859061, 842669 |
| Volvo Penta | TAMD40A | 4-Stroke | 859061, 842669 |
| Volvo Penta | TAMD40B | 4-Stroke | 859061, 842669 |
Technical Specs
- Product Type
- Thermostat Housing/Heat Exchanger Gasket
- Installation
- Direct Replacement
- Fuel Type
- Diesel
- Housing Material
- Composite/Paper
- Dimensions
- 19.0" L x 12.0" W x 1.0" H
- Other Technical Attributes
- Heat-resistant sealing gasket for thermostat housing/heat exchanger connection
What’s in the Box
- 1 x Gasket - Thermostat Housing/Heat Exchanger (Replaces 859061/842669)
Installation Notes
- Ensure the engine is completely cool and disconnect the battery for safety.
- Drain the engine coolant to a level below the thermostat housing.
- Carefully remove the fasteners securing the thermostat housing cover.
- Remove the old gasket. Thoroughly clean both mating surfaces to remove any old gasket material, sealant, or corrosion.
- Position the new gasket correctly on the housing.
- Reinstall the housing cover and tighten the fasteners to the manufacturer’s specified torque.
- Refill the cooling system with the appropriate coolant.
- Reconnect the battery, start the engine, and inspect carefully for any leaks as it comes up to operating temperature.
Troubleshooting & FAQ
How do I know this gasket is the right fit for my Volvo Penta engine?
This gasket is designed for the Volvo Penta 40 Series models listed in the compatibility table (e.g., MD40A, TMD40A, TAMD40A). To ensure a perfect match, always cross-reference your engine model and original part number (859061 or 842669) before ordering.
What are the signs of a failing thermostat housing gasket?
Common symptoms include visible coolant leaks or drips around the thermostat housing, crusty coolant residue, and unexplained engine overheating. A physical inspection might reveal the gasket is brittle, cracked, or compressed.
Do I need to use sealant with this gasket?
This gasket is designed to create a seal on its own and should be installed on clean, dry surfaces. The use of additional sealant is generally not recommended unless explicitly required by your engine’s service manual, as it can sometimes interfere with proper sealing.
What is the difference between part numbers 859061 and 842669?
Part number 842669 is an older, superseded number. 859061 is the current OEM part number for this gasket. Both refer to the same part, and this aftermarket gasket is a direct replacement for either.
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.
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