What does the 0.75mm undersize mean for this bearing set?

The 0.75mm undersize indicates that these bearings are designed for a crankshaft that has been machined down by 0.75mm. This is a common practice during engine rebuilds to restore proper bearing clearance on a worn or damaged crankshaft.

What is the construction of these main bearings?

These main bearings are constructed with a bimetal design, featuring an aluminum base. This type of construction is chosen for its good heat dissipation and lubrication properties, which are important for engine bearing performance.

Are these bearings sold individually or as a set?

This product is a main bearing set, meaning it includes all the necessary main bearings required for a complete engine rebuild of the specified BMW and Opel engines.

Specifications

Brand: King Engine Bearings
Part #: MB7039AM0.75
UPC: 611500387494

King Engine Bearings B.M.W/Opel M 51/M 57/D 25/Y 25 Td (Size +0.75mm) Main Bearing Set

Name: King Engine Bearings B.M.W/Opel M 51/M 57/D 25/Y 25 Td (Size +0.75mm) 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-t14-771079
Price: 130.46 USD
Availability: BackOrder

$130.46

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King Engine Bearings main bearing set for BMW and Opel engines. Features a bimetal aluminum base and is 0.75mm undersize.

Key Features

Fits a wide range of BMW and Opel engines including M 51, M 57, D 25, and Y 25 TD.
Features a bimetal construction with an aluminum base for improved heat transfer and lubrication.
This set is 0.75mm undersize, intended for use with a machined crankshaft.
Main bearing set for engine rebuilding applications.

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About this part

Product Details

King Engine Bearings is known for making well-built engine components, and this main bearing set is no exception. If you're rebuilding the bottom end of your BMW or Opel engine, these bearings are designed to handle the job. They feature a bimetal construction with an aluminum base, which helps with heat dissipation and lubrication. This particular set is sized 0.75mm undersize, meaning it's intended for crankshafts that have been machined down to match this specification during an engine rebuild.

These bearings fit a wide range of BMW and Opel vehicles, including models like the BMW 325i, 528i, and Z3. The bimetal design is a popular choice for many performance and daily driver applications because it offers a good balance of strength and conformability, allowing the bearing to properly seat against the crankshaft. Having the correct bearing clearance is crucial for oil pressure and engine longevity, and using a set that's been machined to the proper undersize ensures you can achieve that critical clearance.