What does '.25mm oversized' mean for these bearings?

This means the bearings are manufactured to be 0.25 millimeters larger in diameter than standard size. This is typically used when the crankshaft journals have been machined down slightly (ground undersize) during a rebuild, and a larger bearing is needed to restore the correct oil clearance.

Are these bearings sold individually or as a set?

This kit includes a full set of main bearings required for the S85B50 V10 engine. You get all the necessary bearings to replace the main bearings on your crankshaft in one package.

What is the primary function of main bearings in an engine?

Main bearings support the crankshaft within the engine block, allowing it to rotate smoothly. They maintain the critical oil clearance between the crankshaft journals and the block, which is essential for proper lubrication and preventing metal-on-metal contact.

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Specifications

Brand: ACL
Part #: 6M1581H-.25
UPC: 9315726469804

ACL BMW S85B50 5.0L V10 .25mm Oversized Main Bearings

Name: ACL BMW S85B50 5.0L V10 .25mm Oversized Main Bearings
Brand: ACL
SKU: acl-acl-bmw-s85b50-5-0l-v10-25mm-oversized-main-bearings-t14-719915
Price: 361.97 USD
Availability: BackOrder

$361.97

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Fits 2006-2010 BMW M5. ACL .25mm oversized main bearings for the S85B50 V10 engine. Ensures a precise fit during rebuild.

Key Features

Fits 2006-2010 BMW M5.
Designed for the S85B50 5.0L V10 engine.
Main bearings are .25mm oversized for precise crankshaft journal fitment.
Well-built by ACL, a reputable engine bearing manufacturer.
Essential component for engine rebuilds.

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About this part

Product Details

You get a full set of .25mm oversized main bearings in this kit, which means you're ready to precisely rebuild the crankshaft assembly for your 2006-2010 BMW M5. These bearings are specifically made for the S85B50 5.0L V10 engine, ensuring they match the original dimensions with a slight adjustment for a perfect fit during a rebuild. Proper bearing clearance is critical for oil flow and engine longevity, and these ACL bearings are well-built to handle that job.

ACL has been making engine bearings for a long time, and they're known for their consistent manufacturing. These main bearings are built to meet the demands of the high-revving S85 V10. The .25mm oversized dimension is important; it means these are intended for engines that may have had some wear on the crankshaft journals and require a slightly larger bearing to achieve the correct oil clearance. This is a key component for anyone undertaking a serious engine rebuild on their M5.