What does 'Standard Size' mean for these bearings?

Standard size bearings are meant for a crankshaft that is within its original factory specifications or has been machined back to standard size. If your crankshaft has been ground undersize due to wear or damage, you would need a different size bearing.

What is the Tri-Metal overlay?

The Tri-Metal overlay is a material construction used by King Engine Bearings. It's a combination of three different metals designed to offer excellent wear resistance and the ability to conform to the crankshaft surface, which helps maintain oil pressure and protect the bearing.

Are these bearings sold individually or as a set?

This product is a main bearing set, which includes all the necessary bearings to replace the main bearings for your engine's crankshaft.

King Engine Bearings Main Bearing Set STD MB7781SX

Name: King BMW N57 D30 A/B/C/N57N/N57S Main Bearing Set - Size STD
Brand: King Engine Bearings
SKU: king-engine-bearings-king-bmw-n57-d30-a-b-c-n57n-n57s-main-bearing-set-size-std-t14-896046
Price: 149.76 USD
Availability: BackOrder

King BMW N57 D30 A/B/C/N57N/N57S Main Bearing Set - Size STD

$149.76

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

King Engine Bearings main bearing set for BMW N57 D30 engines. Standard size.

Key Features

Fits BMW N57 D30 A/B/C/N57N/N57S engines.
Standard size bearings for use with factory or machined crankshafts.
Features King's Tri-Metal overlay for improved wear resistance and load handling.
Designed to maintain proper oil film thickness for engine protection.
Well-built components for reliable engine operation.

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Product Details

The MB7781SX main bearing set from King Engine Bearings is built with their unique Tri-Metal overlay, a strong material choice for the demanding environment inside your BMW's N57 D30 engine. This overlay is designed to handle the high loads and temperatures encountered during operation, helping to protect your crankshaft and ensure smooth engine function. These are standard size bearings, meaning they are intended for use with an unworn or freshly machined crankshaft that is still within its original factory specifications.

King Engine Bearings has been a popular name in engine components for a long time, and their focus on material science is evident here. The Tri-Metal construction offers a good balance of wear resistance and conformability, which is crucial for maintaining oil film thickness and preventing premature wear. If you're rebuilding the bottom end of your N57 D30 engine, a well-built main bearing set like this is essential for long-term reliability and performance. They fit right into the factory main caps, making installation straightforward for a mechanic familiar with engine builds.