What does the +0.25mm size mean for these bearings?

The +0.25mm designation indicates that these bearings are slightly larger than standard size. This is typically used when the crankshaft journals have been machined undersize during an engine rebuild to ensure proper clearance and oil film.

What is the Tri-M+ Babbitt overlay?

Tri-M+ is an enhanced Babbitt overlay applied to the bearing surface. It's designed to improve the bearing's ability to conform to the crankshaft and handle medium loads, contributing to better durability and performance.

Are these bearings sold individually or as a set?

This product is sold as a complete set of five crankshaft main bearings, which is the quantity needed for a full engine installation on the BMW M3.

Specifications

Brand: King Engine Bearings
Part #: MB5803CA0.25
UPC: 611500598371

King Engine Bearings BMW S65B40A (Size +0.25mm) Crankshaft Main Bearing ( Set of 5 )

Name: King Engine Bearings BMW S65B40A (Size +0.25mm) Crankshaft Main Bearing ( Set of 5 )
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-bmw-s65b40a-size-0-25mm-crankshaft-mai-t14-208034
Price: 228.70 USD
Availability: BackOrder

$228.70

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Fits 2008-2013 BMW M3. King Engine Bearings crankshaft main bearing set (+0.25mm size) for reliable engine performance.

Key Features

Fits 2008-2013 BMW M3.
Set includes five crankshaft main bearings.
Features a +0.25mm undersize for machined crankshaft journals.
Constructed with a tri-metal copper-based material.
Includes an enhanced Tri-M+ Babbitt overlay.
Suitable for medium-load engines.

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About this part

Product Details

King Engine Bearings has been a specialist in engine bearings since 1960, focused on supplying the highest quality components. This set of five crankshaft main bearings is specifically made for the 2008-2013 BMW M3, featuring a +0.25mm undersize to account for crankshaft journal machining during an engine rebuild.

These bearings are constructed with a tri-metal copper-based material and an enhanced Babbitt overlay, known as Tri-M+, which is ideal for medium-load engines like the S65B40A found in the M3. This construction helps ensure durability and consistent performance for your engine's critical rotating assembly.