What does the +0.25mm sizing mean for this bearing set?

The +0.25mm sizing indicates that these bearings are intended for use when the crankshaft journals have been machined down by 0.25mm. This is a common step in engine rebuilding to correct wear and restore proper oil clearances.

What is the construction of these main bearings?

These main bearings feature a bimetal construction with an aluminum base. This design offers a good balance of strength and wear resistance for engine applications.

Are these bearings compatible with all BMW M30 engines?

This set is designed to fit many BMW M30 engines across various models and years, from the 2500 and 2800 series to later 535i, 635CSi, and 735i models. Always verify your specific engine code and year for compatibility.

King Engine Bearings BMW M30B35/25/28/32/33/35 (Size +0.25mm) Main Bearing Set

Specifications

Brand: King Engine Bearings
Part #: MB770AM0.25
UPC: 611500180613

King Engine Bearings BMW M30B35/25/28/32/33/35 (Size +0.25mm) Main Bearing Set

Name: King Engine Bearings BMW M30B35/25/28/32/33/35 (Size +0.25mm) Main Bearing Set
Brand: King Engine Bearings
Price: 96.78 USD
Availability: InStock

$96.78

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King Engine Bearings M30 main bearing set, MB770AM0.25. Features a bimetal aluminum base for BMW M30 engines.

Key Features

Fits 1968-1993 BMW M30 engines.
Main bearing set is sized +0.25mm for use with machined crankshafts.
Constructed with a bimetal material on an aluminum base for strength and wear resistance.
Designed as a direct fit replacement for the original main bearings.

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Product Details

With a bimetal construction on an aluminum base, this main bearing set from King Engine Bearings is built for durability in BMW M30 engines. This set is specifically sized at +0.25mm, meaning it's intended for engines where the crankshaft journals have been machined down by that amount during a rebuild. This is a common practice to restore proper clearances when wear is present.

King Engine Bearings uses a bimetal material that offers good strength and wear resistance, suitable for the demands of a performance or daily-driven engine. This set is designed to fit a wide range of BMW M30 applications, including models like the 535i, 735i, and 635CSi, among many others. Proper installation with correct oil clearances is crucial for the longevity of these bearings and the overall health of your engine.