What does the +1.0mm size indicate for these bearings?

The +1.0mm designation means these bearings are 1.0 millimeter larger in diameter than standard size. This is typically used when the crankshaft journals have been machined undersize during an engine rebuild to remove wear or damage.

What is the benefit of the bimetal construction with an aluminum base?

The bimetal construction with an aluminum base offers good wear resistance and the ability to conform to the crankshaft surface. This helps maintain a consistent oil film, which is critical for reducing friction and wear in high-load engine applications.

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 installation on the specified BMW M30 engines.

King Engine Bearings Main Bearing Set MB770AM1.0

Name: King Engine Bearings BMW M30B35/25/28/32/33/35 (Size +1.0mm) Main Bearing Set
Brand: King Engine Bearings
Price: 96.78 USD
Availability: InStock

King Engine Bearings BMW M30B35/25/28/32/33/35 (Size +1.0mm) Main Bearing Set

$96.78

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King Engine Bearings main bearing set for BMW M30 engines. Size +1.0mm. Verified fitment.

Key Features

Fits BMW M30B35/25/28/32/33/35 engines.
Main bearing set with a +1.0mm size.
Constructed with a bimetal design featuring an aluminum base.
Designed for a range of BMW vehicles including the 5 Series, 6 Series, and 7 Series.

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Product Details

These main bearings from King Engine Bearings are built with a bimetal construction, featuring an aluminum base. This design is crucial for handling the loads and heat generated within the crankcase of BMW M30 engines. They are supplied at a +1.0mm size, which is important for engines that have had their crankshaft ground down during a rebuild or repair process.

King Engine Bearings is a well-known name in engine components, and this set is designed to meet the needs of M30 engines found in a range of BMW vehicles, including models like the 535i, 735i, and 635CSi. The bimetal material offers good wear resistance and conformability, helping to maintain oil film integrity under various operating conditions. Using bearings of the correct size, like these +1.0mm units, is essential for proper oil clearance and engine longevity.

When rebuilding or repairing an M30 engine, ensuring you have the correct size bearings is key. These main bearings are a solid option for restoring proper crankshaft support and oil flow.