What does '0.25 Oversized' mean for these bearings?

This means the bearings are 0.25mm larger in diameter than standard. They are intended for use when the crankshaft journals have been machined down by 0.25mm to remove wear or imperfections during an engine rebuild.

What is the construction of these main bearings?

These bearings are made with a bimetal construction, featuring a strengthened aluminum overlay. This design helps them withstand the demands of engines like the BMW B58.

Do these bearings come with installation instructions?

This bearing set does not include specific installation instructions. It is recommended to refer to the vehicle manufacturer's service manual or a professional mechanic for proper installation procedures.

King Engine Bearings BMW B58B30A (Size 0.25 Oversized) Main Bearing Set

Specifications

Brand: King Engine Bearings
Part #: MB7779SM0.25
UPC: 611500591495

King Engine Bearings BMW B58B30A (Size 0.25 Oversized) Main Bearing Set

Name: King Engine Bearings BMW B58B30A (Size 0.25 Oversized) Main Bearing Set
Brand: King Engine Bearings
Price: 68.06 USD
Availability: InStock

$68.06

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King Engine Bearings main bearing set for BMW B58 and Toyota Supra engines. 0.25 oversize.

Key Features

Fits a wide range of BMW and Toyota Supra vehicles with the B58 engine.
Main bearing set designed for crankshaft support.
Features a bimetal construction with a strengthened aluminum overlay.
This set is 0.25mm oversized for use with machined crankshaft journals.
Part number MB7779SM0.25.

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Will this fit your vehicle?

Product Details

If you're rebuilding the bottom end of a BMW B58 engine or a Toyota Supra, this main bearing set from King Engine Bearings is a solid option. These are the main bearings, which support the crankshaft within the engine block. This particular set is 0.25mm oversized, meaning it's designed to be used when the crankshaft journals have been machined down by 0.25mm to clean up wear or damage.

King uses a bimetal construction with a strengthened aluminum overlay for these bearings. This design helps them handle the loads and temperatures found in performance engines like the B58. They fit a range of BMW models including the 340i, 440i, 540i, 740i, and M240i, as well as the Toyota Supra. Having the correct bearing clearance is critical for oil pressure and engine longevity, so using a precisely sized bearing like this is important for a proper rebuild.