What does the '0.25' size designation mean for these bearings?

The '0.25' in MB5863MC0.25 indicates that these are 0.25mm undersize bearings. This means they are intended for use when the crankshaft journals have been machined down by 0.25mm to correct wear or damage.

What is the primary function of main bearings in an engine?

Main bearings support the crankshaft within the engine block. They create a precise clearance for oil to lubricate the spinning crankshaft, reducing friction and wear while ensuring the crankshaft remains properly aligned.

Are these bearings sold individually or as a set?

This is a set of main bearings. It includes all the necessary main bearings required to support the crankshaft in a Toyota 3UR-FE engine during a rebuild.

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Specifications

Brand: King Engine Bearings
Part #: MB5863MC0.25
UPC: 611500620423

King Engine Bearings Toyota 3UR-FE (Size 0.25) Main Bearing Set

Name: King Engine Bearings Toyota 3UR-FE (Size 0.25) Main Bearing Set
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-toyota-3ur-fe-size-0-25-main-bearing-s-t14-432567
Price: 100.28 USD
Availability: BackOrder

$100.28

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King Engine Bearings Toyota 3UR-FE (Size 0.25) Main Bearing Set. For rebuilding your engine's bottom end.

Key Features

Main bearing set for Toyota 3UR-FE engines.
Size is 0.25mm undersize, for use with machined crankshafts.
Part number MB5863MC0.25.

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About this part

Product Details

If you're rebuilding the bottom end of your Toyota 3UR-FE engine, a fresh set of main bearings is crucial. These King Engine Bearings are specifically sized at 0.25mm undersize, meaning they're designed to be used when the crankshaft journals have been machined down by that amount to clean them up or correct wear. Proper main bearings ensure the crankshaft spins smoothly within the engine block, maintaining the correct oil clearances for lubrication and preventing premature wear.

King Engine Bearings are well-built for reliable performance in rebuilt engines. The MC designation in the part number indicates their specific material composition and design, aimed at providing good durability and oil retention. Installing these bearings correctly, with the proper torque specifications and clean assembly practices, is key to a successful engine rebuild. Always ensure your crankshaft journals are properly prepped and measured before installing undersize bearings.