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

The +0.25mm designation indicates that these bearings are designed for crankshaft journals that have been machined down by 0.25mm. This is a common practice during engine rebuilding to address wear or minor imperfections on the original journals.

What is the construction of these main bearings?

These bearings feature a bimetal construction, which means they have an aluminum base. This type of bearing is known for its good load-carrying capabilities and durability in engine applications.

Are these bearings a direct replacement for all M10 engines?

This specific bearing set is sized at +0.25mm, which is an undersize. You should only use this set if your crankshaft has been machined to this specific size. Standard size bearings would be required if the crankshaft journals are still at their original factory dimensions.

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King Engine Bearings BMW M10B15/18/20 (Size +0.25mm) Main Bearing Set

Specifications

Brand: King Engine Bearings
Part #: MB544AM1.25
UPC: 611500167027

King Engine Bearings BMW M10B15/18/20 (Size +0.25mm) Main Bearing Set

Name: King Engine Bearings BMW M10B15/18/20 (Size +0.25mm) Main Bearing Set
Brand: King Engine Bearings
Price: 107.37 USD
Availability: InStock

$107.37

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King Engine Bearings main bearing set for BMW M10 engines. Size +0.25mm. Essential for engine rebuilds.

Key Features

Fits BMW M10B15, M10B18, and M10B20 engines.
Main bearing set with a +0.25mm undersize.
Bimetal construction with an aluminum base for good wear resistance.
Designed to support the crankshaft in the engine block.
Suitable for engine rebuilding applications.

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Will this fit your vehicle?

Product Details

If you're rebuilding the bottom end of your BMW M10 engine, a fresh set of main bearings is critical. These bearings sit between the crankshaft and the engine block, supporting the rotating assembly and ensuring smooth operation. This set from King Engine Bearings is specifically sized at +0.25mm, meaning it's intended for use when the crankshaft journals have been machined down by that amount to clean up wear or damage.

These bearings are constructed with a bimetal design, featuring an aluminum base. This construction offers good load-carrying capacity and wear resistance, making them a solid option for keeping your M10 engine running reliably. They fit a range of classic BMW models, including the 1800, 2002, and 318i, among others, making them a popular choice for enthusiasts working on these iconic engines.