Main Bearing Kit – Fits Volvo Penta Marine Engines (Replaces 21226191)
Main Bearing Kit – Fits Volvo Penta Marine Engines (Replaces 21226191) 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
Main Bearing Kit – Fits Volvo Penta Marine Engines (Replaces 21226191)
Product Details
This aftermarket Main Bearing Kit – Fits Volvo Penta Marine Engines is designed for various Volvo Penta marine diesel applications. It serves as a direct-fit replacement component for restoring engine performance and reliability within the engine block crankshaft assembly.
This kit provides a direct interchange for Volvo Penta part number 21226191 and its superseded predecessor, 3884515.
- Installs within the engine block to support the crankshaft.
- Engineered for use in diesel fuel marine environments.
- Kit contains a complete set of main bearings for a full service.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Notes |
|---|---|---|
| Volvo Penta | 21226191 | Direct Aftermarket Replacement |
| Volvo Penta | 3884515 | Superseded by 21226191 |
Engine & Model Compatibility
This main bearing kit is used across a wide range of Volvo Penta marine diesel engines. Due to the extensive variety of models and years, we recommend verifying compatibility by matching your existing part number to 21226191 before ordering.
Technical Specs
- Product Type
- Main Bearing Kit
- Fitment Location
- Engine Block Crankshaft
- Fuel Type
- Diesel
- Construction
- Built to Original Equipment Specifications
- Weight
- 0.12 kg
- Dimensions
- 9.0" L x 8.5" W x 4.0" H
What’s in the Box
- 1 x Main Bearing Kit (21226191)
Installation Notes
Professional installation is strongly recommended. This is a general guide and may not match your specific engine model; always consult your official service manual.
- Drain engine oil and remove the oil filter.
- Carefully detach the oil pan and any related components like the oil pickup tube.
- Sequentially unbolt and remove the main bearing caps, keeping them in precise order.
- Remove the old main bearing halves from the block and caps.
- Thoroughly clean all surfaces, ensuring no oil, sealant, or debris remains.
- Place the new bearing halves into the engine block and bearing caps, observing correct orientation and locator tangs.
- Apply a quality assembly lubricant to the new bearings and crankshaft journals.
- Reinstall the crankshaft and main bearing caps. Torque all bolts to the manufacturer's specified sequence and values using a calibrated torque wrench.
- Reassemble the oil pan with a new gasket, install a new oil filter, and refill with new engine oil to the correct level.
Troubleshooting & FAQ
How do I know if my main bearings need replacement?
Common signs of failing main bearings include a deep, rumbling or knocking sound from the engine that increases with RPM, low oil pressure readings, and potentially metallic particles found in the engine oil during a change.
Is this kit compatible with my specific engine model?
This kit fits a wide range of Volvo Penta diesel engines. The most reliable method for confirming fitment is to match your old part's number to 21226191. If you cannot find a part number, consult a professional marine mechanic or your engine's service manual.
What is the main cause of main bearing failure?
The most common causes include oil starvation or contamination, improper installation (incorrect torque or clearance), engine overheating, and normal wear over many hours of operation.
Do I need special tools for this installation?
Yes, installation requires specialized tools such as a calibrated torque wrench, bearing pullers/installers, and potentially micrometers or Plastigauge to verify clearances. Due to the precision required, 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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