What does the +0.25mm sizing mean for these bearings?

The +0.25mm sizing indicates that these bearings are intended for use when the crankshaft has been machined down by 0.25mm during an engine rebuild. This ensures a proper fit and clearance on a resurfaced crankshaft.

What is Manganx and why is it used?

Manganx is a strengthening component within the bi-metal aluminum material of these bearings. It's used to enhance the durability and load-carrying capacity of the bearing surface, helping it withstand the stresses of engine operation.

Are these bearings environmentally friendly?

Yes, these bearings utilize a lead-free composite material. This makes them an environmentally safer choice compared to older bearing designs that contained lead.

Specifications

Brand: King Engine Bearings
Part #: MB7781SM0.25
UPC: 611500594502

King Engine Bearings BMW N57 D30 A/B/C/N57N/N57S Main Bearing Set - Size +0.25mm

Name: King Engine Bearings BMW N57 D30 A/B/C/N57N/N57S Main Bearing Set - Size +0.25mm
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-bmw-n57-d30-a-b-c-n57n-n57s-main-beari-t14-325258
Price: 85.86 USD
Availability: InStock

$85.86

Only 5 left in stock

King Engine Bearings BMW N57 D30 A/B/C/N57N/N57S Main Bearing Set - Size +0.25mm. A well-built bearing set for engine rebuilding.

Key Features

Fits BMW N57 D30 A/B/C/N57N/N57S engines.
Main bearing set for crankshaft support.
Sized +0.25mm for machined crankshafts.
Constructed with a bi-metal aluminum material.
Features Manganx strengthening for improved durability.
Lead-free composite is environmentally safe.

⚠️ CA WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Learn more

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About this part

Product Details

If you're rebuilding the engine in your BMW N57 D30 A/B/C/N57N/N57S, this King Engine Bearings Main Bearing Set is a solid option. These are the main bearings that support the crankshaft within the engine block. King has been specializing in bearings since 1960, focusing on making them as durable as possible.

This particular set is sized at +0.25mm, meaning it's meant for crankshafts that have been machined down by that amount during an engine rebuild. The bearings themselves are constructed with a bi-metal aluminum material that's strengthened with Manganx. This composite is lead-free, making it an environmentally safer choice for your build. The goal is to provide a strong, reliable surface for the crankshaft to spin on, reducing friction and wear over time.