Main Bearing Kit – Fits Volvo Penta AQ131C, AQ151C, AQ171C (Replaces 270907)
Main Bearing Kit – Fits Volvo Penta AQ131C, AQ151C, AQ171C (Replaces 270907) is backordered and will ship as soon as it is back in stock.
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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.).
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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 AQ131C, AQ151C, AQ171C (Replace...
Product Details
This Main Bearing Kit – Fits Volvo Penta AQ131C, AQ151C, AQ171C (Replaces 270907) is engineered for Volvo Penta 4-cylinder gasoline marine engines, including AQ131C, AQ151C, and AQ171C models. It also fits D230A/B, D250A/B, and D251A engines.
It serves as a direct replacement for Volvo Penta 270907 and aftermarket parts ORB11907 and AM270907.
- Installs as a direct factory replacement.
- Features a 0.25 mm (0.010 inch) undersize specification for crankshafts that have been previously ground.
- The thrust washer is integrated into the design of the rear-most main bearing shell for a comprehensive fit.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Volvo Penta | 270907 |
| Aftermarket | ORB11907 |
| Aftermarket | AM270907 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
| Brand | Model | Stroke | OEM Part No. | Notes |
|---|---|---|---|---|
| Volvo Penta | AQ131C | 4-Stroke | 270907 | |
| Volvo Penta | AQ151C | 4-Stroke | 270907 | |
| Volvo Penta | AQ171C | 4-Stroke | 270907 | |
| Volvo Penta | D230A | 4-Stroke | 270907 | |
| Volvo Penta | D230B | 4-Stroke | 270907 | |
| Volvo Penta | D250A | 4-Stroke | 270907 | |
| Volvo Penta | D250B | 4-Stroke | 270907 | |
| Volvo Penta | D251A | 4-Stroke | 270907 | |
| Volvo Penta | B200, B230 Series | 4-Stroke | 270907 | For engines with 63 mm diameter main bearings |
| Volvo Penta | B230F, B230FT | 4-Stroke | 270907 | For engines with 63 mm diameter main bearings |
Technical Specs
- Product Type
- Main Bearing Kit
- Installation
- Direct replacement
- Fuel Type
- Gasoline
- Dimensions
- 95 × 105 × 65 mm (L × W × H)
- Weight
- 0.41 kg (0.9 lb)
- Undersize
- 0.25 mm (0.010 inch) for ground crankshafts
What’s in the Box
- 1 x Main Bearing Set (Replaces 270907)
Installation Notes
- Disconnect the battery and ensure the engine is cool.
- Safely elevate the engine and drain the engine oil completely.
- Remove the oil pan and oil pickup tube to access the crankshaft.
- 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, caps, and crankshaft journals of all oil and debris.
- Apply assembly lube to the new bearing shells.
- Place the new bearing shells into their correct positions in the block and caps.
- Reinstall the main bearing caps and torque the bolts to the manufacturer's specified sequence and values.
- Check for proper crankshaft rotation.
- Reinstall the oil pickup tube and oil pan with new gaskets.
- Lower the engine, refill with new oil, and reconnect the battery.
Troubleshooting & FAQ
How do I know if this bearing kit fits my engine?
This kit is designed for specific Volvo Penta engines, including the AQ131C, AQ151C, AQ171C, and various D-series and B-series models. Always cross-reference your engine model and part number with our compatibility lists. It is critical that your engine uses 63 mm diameter main bearings.
What does "0.25 mm undersize" mean?
An "undersize" bearing is for a crankshaft that has been machined (ground) to a smaller diameter, typically to repair scoring or wear. This 0.25 mm (0.010") undersize kit has a thicker shell to compensate for the material removed from the crankshaft, restoring the correct oil clearance.
Is a separate thrust washer needed for installation?
No. For this specific kit, the thrust washer function is integrated into the rear-most main bearing shell, simplifying installation and ensuring proper crankshaft end play.
What are the signs of failing main bearings?
Common symptoms include a deep, rhythmic knocking or rumbling sound from the lower engine (especially under load), low oil pressure readings, and the presence of metallic particles in the engine oil during an oil change.
When should main bearings be replaced?
Main bearings are typically replaced during a complete engine rebuild or when signs of failure, such as engine knock or low oil pressure, become apparent. They are a critical wear item and should be inspected whenever the crankshaft is accessible.
Is this an OEM part or an aftermarket equivalent?
This listing is an aftermarket replacement (not OEM). It's built to OEM-level specifications with comparable materials and manufactured in an ISO 9002 facility, with batch inspections for consistency.
What are the shipping speed and cost?
We ship worldwide quickly—typical transit is 5–15 days. Standard shipping is free, and expedited options may appear at checkout where available for your location.
What is the warranty and return policy?
This product is covered by a 1-year warranty against manufacturing defects under normal use. If any issues arise, please contact our support team with your order details. Returns are accepted within our standard window, provided the item is unused and in its original condition. See our policy page or reach out for instructions.
Safety & Important Info
- Verify images and specifications against your original part before purchasing. If anything differs—even if your model appears compatible—do not complete the purchase.
- This is an aftermarket replacement component, not an original equipment manufacturer (OEM) part.
- Professional installation is strongly recommended for safety and to ensure optimal performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and rigorously tested for real-world conditions.
- Fast Global Fulfillment — We offer free standard delivery to most regions, with typical transit times of 5–15 days.
- Manufacturer-Direct Value — Our model provides fair pricing without compromising on materials or quality control.
Payment & Security
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