What does the '+1.0mm' sizing mean for these bearings?

The '+1.0mm' indicates that these bearings are 1.0 millimeter larger in diameter than standard size. This is used when the crankshaft journals have been machined down by 1.0mm to remove wear or damage, and a larger bearing is needed to restore proper oil clearance.

What is a bimetal bearing construction?

A bimetal bearing uses two different layers of material. Typically, this involves a steel backing for strength and an aluminum alloy overlay that contacts the crankshaft, offering good load-carrying capacity and conformability.

What other parts are typically needed when replacing main bearings?

When replacing main bearings, it's common practice to also replace the connecting rod bearings (also known as rod bearings) and the crankshaft thrust bearings. You will also need new engine oil and an oil filter for the reassembly.

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King Engine Bearings BMW M10B15/18/20 (Size +1.0mm) Main Bearing Set

Specifications

Brand: King Engine Bearings
Part #: MB544AM1.0
UPC: 611500167010

King Engine Bearings BMW M10B15/18/20 (Size +1.0mm) Main Bearing Set

Name: King Engine Bearings BMW M10B15/18/20 (Size +1.0mm) 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. Features bimetal construction for durability.

Key Features

Fits a range of BMW M10B15, M10B18, and M10B20 engines.
Main bearing set sized at +1.0mm for machined crankshafts.
Features a bimetal construction with an aluminum base.
Designed for classic BMW models including the 1800, 2002, and 320i.

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Product Details

If you're rebuilding the bottom end of your BMW M10 engine, a fresh set of main bearings is crucial. These King Engine Bearings are designed for the M10B15, M10B18, and M10B20 engine families, covering a wide range of classic BMW models like the 1800, 2002, and 320i.

These bearings are constructed with a bimetal design, meaning they have an aluminum base. This construction helps them handle the loads and heat generated within the engine. This set is specifically sized at +1.0mm, which is important if you're machining your crankshaft to match this size during your rebuild.

Having the correct main bearings ensures proper oil clearance and support for your crankshaft, which is vital for engine longevity. Make sure to check your crankshaft journals for the correct size and condition before installation.