What does the +0.25mm sizing mean for these main bearings?

The +0.25mm sizing indicates that these bearings are designed for a crankshaft that has had its main journals machined down by 0.25mm. This is common during engine rebuilds to clean up worn or damaged surfaces.

What is the benefit of a bimetal aluminum base construction?

A bimetal aluminum base offers a strong yet conformable bearing surface. This helps maintain oil film thickness under load, reducing friction and wear on the crankshaft.

Are these bearings sold individually or as a set?

This product is a main bearing set, meaning it includes all the necessary main bearings to service the BMW 318 engine.

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Specifications

Brand: King Engine Bearings
Part #: MB5578AM0.25
UPC: 611500206115

King Engine Bearings B.M.W 318 (Size +0.25mm) Main Bearing Set

Name: King Engine Bearings B.M.W 318 (Size +0.25mm) Main Bearing Set
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-b-m-w-318-size-0-25mm-main-bearing-set-t14-770857
Price: 56.14 USD
Availability: BackOrder

$56.14

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King Engine Bearings B.M.W 318 (Size +0.25mm) Main Bearing Set. Bimetal aluminum base construction for durability.

Key Features

Main bearing set for BMW 318.
Features a bimetal aluminum base construction.
Size is +0.25mm, intended for machined crankshaft journals.
Supports the crankshaft and handles engine loads.

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About this part

Product Details

Built with a bimetal aluminum base, this main bearing set from King Engine Bearings is designed for the BMW 318. Main bearings are critical components that support the crankshaft within the engine block, allowing it to spin smoothly while handling immense loads. This set is specifically sized at +0.25mm, meaning it's intended for engines where the crankshaft journals have been machined down by 0.25mm during a rebuild or repair process.

The bimetal construction offers a good balance of strength and conformability, helping to maintain oil film integrity under pressure. This is important for reducing friction and wear on your crankshaft and bearings, especially in performance or high-mileage applications. King Engine Bearings is a well-known name in engine components, and this set is a solid option for anyone rebuilding or refreshing the bottom end of their BMW 318 engine.