What does '1.0mm undersize' mean for these bearings?

This means the bearings are manufactured to be 1.0mm smaller in diameter than a standard size bearing. This is typically used when the crankshaft journals have been machined down by 1.0mm to remove wear or damage.

What is the construction of these main bearings?

These bearings feature a bimetal construction with an aluminum base. This design is common for main bearings as it offers good performance characteristics for engine operation.

Are these bearings sold individually or as a set?

This product is a main bearing set, meaning it includes all the necessary bearings to replace the main bearings for the specified engine applications.

Specifications

Brand: King Engine Bearings
Part #: MB7039AM1.0
UPC: 611500430978

King Engine Bearings B.M.W/Opel M 51/M 57/D 25/Y 25 Td (Size +1.0mm) Main Bearing Set

Name: King Engine Bearings B.M.W/Opel M 51/M 57/D 25/Y 25 Td (Size +1.0mm) Main Bearing Set
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-b-m-w-opel-m-51-m-57-d-25-y-25-td-size-t14-771080
Price: 130.46 USD
Availability: BackOrder

$130.46

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King Engine Bearings main bearing set for BMW/Opel M 51, M 57, D 25, Y 25 TD engines. Includes 1.0mm undersize bearings.

Key Features

Fits a wide range of BMW and Opel M 51, M 57, D 25, Y 25 TD engines.
Main bearing set with a bimetal construction and aluminum base.
Bearings are 1.0mm undersize, suitable for machined crankshafts.
Part number MB7039AM1.0.

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About this part

Product Details

If you're rebuilding the bottom end of your BMW or Opel engine, specifically models like the M 51, M 57, D 25, or Y 25 TD, a solid set of main bearings is crucial. These King Engine Bearings main bearing set is built with a bimetal construction, using an aluminum base for good performance. This set is sized 1.0mm undersize, which is important to know if you're machining your crankshaft to match.

King Engine Bearings is a well-known name in the engine parts world, and this set is designed to fit a wide range of BMW and Opel vehicles. Whether you're working on a 1980s 528e or a newer Z4, these bearings are made to meet the needs of an engine rebuild. The bimetal construction is a common and effective choice for main bearings, balancing strength with the ability to conform to the crankshaft.