Main Bearing Kit – Fits Volvo Penta MD1B, MD2B, MD3B, MD11, MD17 Diesel Engines (Replaces 875485)
Main Bearing Kit – Fits Volvo Penta MD1B, MD2B, MD3B, MD11, MD17 Diesel Engines (Replaces 875485) 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
Main Bearing Kit – Fits Volvo Penta MD1B, MD2B, MD3B, MD11, MD17 Di...
Product Details
This aftermarket Main Bearing Kit is designed for a range of Volvo Penta diesel engines, including the MD1B, MD2B, MD3B, MD11, and MD17 series manufactured between 1970 and 1984. It serves as a direct-fit replacement for worn or damaged main bearings, ensuring proper crankshaft support within the engine block.
It is a direct replacement for Volvo Penta part number 875485, specified as a 0.25mm undersize bearing set.
- Installation: Mounts directly into the engine block.
- Engine Type: Designed exclusively for diesel engines.
- Specification: This is a 0.25mm undersize bearing kit.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket suppliers.
| Brand | Part Number |
|---|---|
| Volvo Penta | 875485 |
Engine & Model Compatibility
Confirm your engine model and year in the table below to ensure accurate fitment.
| Brand | Model | Years | OEM Part No. |
|---|---|---|---|
| Volvo Penta | AQD2B | 1972–1975 | 875485 |
| Volvo Penta | MD1B | 1970–1973 | 875485 |
| Volvo Penta | MD2B | 1970–1975 | 875485 |
| Volvo Penta | MD3B | 1971–1975 | 875485 |
| Volvo Penta | MD11C | 1975–1981 | 875485 |
| Volvo Penta | MD11D | 1981–1983 | 875485 |
| Volvo Penta | MD17C | 1975–1981 | 875485 |
| Volvo Penta | MD17D | 1981–1984 | 875485 |
Technical Specs
- Product Type
- Main Bearing Kit
- Installation
- Engine Block
- Fuel Type
- Diesel
- Housing Material
- Metal/Alloy
- Dimensions
- Length: 8.0 cm, Width: 6.5 cm, Height: 4.0 cm
- Weight
- 0.14 kg (0.31 lb)
- Other Technical Attributes
- 0.25mm undersize U.S.
What’s in the Box
- 1 x Main Bearing Kit (Replaces 875485)
Installation Notes
- Ensure the engine is turned off, disconnected from power, and cool to the touch.
- Drain the engine oil completely.
- Access the crankcase by removing the oil pan and any obstructing components.
- Carefully unbolt and remove the main bearing caps, keeping them in order.
- Remove the old main bearing shells from the block and caps.
- Thoroughly clean the bearing saddles and crankshaft journals, ensuring they are free of oil and debris.
- Apply assembly lube to the new bearing shells.
- Install the new bearings into the block and caps, ensuring the locating tangs are correctly seated.
- Reinstall the main bearing caps in their original order and torque the bolts to the manufacturer's specifications.
- Reassemble the remaining components, refill with new engine oil, and check for leaks upon first start.
Troubleshooting & FAQ
What are the signs of a worn main bearing?
Common symptoms include a deep, rumbling or knocking noise from the engine that increases with RPM, low oil pressure, and the presence of metallic particles in the engine oil.
Why is this kit "undersize"?
This 0.25mm undersize kit is for engines where the crankshaft has been machined (ground) during a rebuild. The smaller internal diameter compensates for the material removed from the crank journals to restore a smooth surface.
Do I need special tools to install this kit?
Yes, installation requires specialized tools, including a torque wrench, plastigage for checking oil clearances, and potentially a crankshaft grinding machine if not already done. Professional installation is highly recommended.
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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