What does the '+0.75mm' size designation mean for these bearings?

The '+0.75mm' indicates that these main bearings are 0.75mm larger in diameter than standard size. This means they are designed to be used with a crankshaft that has been machined down by 0.75mm during an engine rebuild process.

What is the 'overlay material' mentioned for these bearings?

King Engine Bearings uses a specialized overlay material, which is a multi-layer coating applied to the bearing surface. This coating is designed to reduce friction and improve wear resistance, helping to ensure the longevity and smooth operation of your engine.

Are these bearings suitable for a brand new, unmachined crankshaft?

No, these bearings are specifically sized at 0.75mm undersize. They are intended for use with a crankshaft that has already been machined down by 0.75mm during a rebuild. Using them on a standard-sized crankshaft would result in excessive clearance and improper oil flow.

Specifications

Brand: King Engine Bearings
Part #: MB5662SI0.75
UPC: 611500600784

King Engine Bearings BMW N42 B20/N46 B20 (Size +0.75mm) Main Bearing Set

Name: King Engine Bearings BMW N42 B20/N46 B20 (Size +0.75mm) Main Bearing Set
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-bmw-n42-b20-n46-b20-size-0-75mm-main-b-t14-770895
Price: 76.84 USD
Availability: BackOrder

$76.84

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King Engine Bearings Main Bearing Set MB5662SI0.75. These 0.75mm undersize bearings are for BMW N42 B20/N46 B20 engines.

Key Features

Main bearing set for BMW N42 B20 and N46 B20 engines.
Machined to a 0.75mm undersize for use with reground crankshafts.
Features King's specialized overlay material for improved wear resistance and reduced friction.
Helps to establish proper oil clearance during engine rebuilds.

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About this part

Product Details

These main bearings from King Engine Bearings are machined to a 0.75mm undersize, meaning they are intended for crankshafts that have been machined down by that amount during an engine rebuild. They are specifically made for BMW N42 B20 and N46 B20 engines, which are common in many BMW models. When you're rebuilding an engine, getting the bearing clearances just right is critical for oil flow and engine longevity. These bearings are built to help you achieve that precise fit.

King uses a special overlay material on these bearings, which is a multi-layer coating designed to handle the demands of modern engines. This overlay helps to reduce friction and wear, ensuring that your engine runs smoothly and lasts longer. The fact that they are a 0.75mm undersize means they are a direct replacement for a crankshaft that has already been reground to that specific size, saving you the step of having to find a different bearing size.