What does '+0.25mm undersize' mean for these bearings?

This means the bearings are manufactured to be slightly smaller than the standard size. They are intended for use with a crankshaft that has been machined down by 0.25mm to account for wear.

What is the material construction of these bearings?

These bearings feature a tri-metal construction. This includes a steel backing for strength, an aluminum alloy layer for embeddability, and a durable overlay material.

Are these bearings a direct replacement for the original equipment?

These bearings are designed for the VW Dkta Ea 888 Gen. III engine and are intended for use with a machined crankshaft. They are not a direct, drop-in replacement for standard-sized bearings.

Specifications

Brand: King Engine Bearings
Part #: MB5880SM0.25
UPC: 611500627354

King Engine Bearings VW Dkta Ea 888 Gen. Iii (Size +0.25mm) Main Bearing Set

Name: King Engine Bearings VW Dkta Ea 888 Gen. Iii (Size +0.25mm) Main Bearing Set
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-vw-dkta-ea-888-gen-iii-size-0-25mm-mai-t14-771034
Price: 30.55 USD
Availability: BackOrder

$30.55

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King Engine Bearings VW Dkta Ea 888 Gen. Iii Main Bearing Set. This +0.25mm set is for rebuilding your engine.

Key Features

This is a +0.25mm undersize main bearing set.
Features a tri-metal construction for strength and wear resistance.
Built with a steel backing for structural integrity.
Includes an aluminum alloy layer for embeddability.
Designed for the VW Dkta Ea 888 Gen. III engine.

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About this part

Product Details

These main bearings are 0.25mm undersize, meaning they are designed to be used with a crankshaft that has been machined down by that amount. This is a common practice when rebuilding an engine to bring worn bearing surfaces back into spec. King Engine Bearings uses a specialized tri-metal material that offers good strength and wear resistance for the demands of a running engine.

The tri-metal construction is built in layers, with a steel backing for strength, a middle layer of aluminum alloy for good embeddability, and a thin overlay of bearing material on top. This layered approach helps the bearing conform to the crankshaft journal while providing a durable surface. This set is specifically made for the VW Dkta Ea 888 Gen. III engine, ensuring a direct fit for the machined crankshaft journals.