What does the 0.25mm undersize specification mean for these bearings?

The 0.25mm undersize means these bearings are designed to be used with a crankshaft that has been machined down by 0.25mm. This is a common practice when rebuilding an engine to clean up the crankshaft journals.

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

Main bearings support the crankshaft in the engine block. They allow the crankshaft to rotate smoothly while handling the immense forces generated during combustion.

What is the typical application for this type of bearing set?

This type of main bearing set is typically used during an engine rebuild or overhaul, especially when the crankshaft has been machined to an undersize specification.

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Specifications

Brand: King Engine Bearings
Part #: MB7779MC0.25
UPC: 611500626685

King Engine Bearings Toyota Supra B58 (Size 0.25) Main Bearing Set

Name: King Engine Bearings Toyota Supra B58 (Size 0.25) Main Bearing Set
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-toyota-supra-b58-size-0-25-main-bearin-t14-432603
Price: 119.27 USD
Availability: BackOrder

$119.27

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King Engine Bearings Toyota Supra B58 Main Bearing Set (Size 0.25). For rebuilding your engine.

Key Features

Fits Toyota Supra B58 engines.
Main bearing set is 0.25mm undersize.
Multi-layer bearing material handles high loads and temperatures.
Designed to work with different crankshaft materials and oils.

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About this part

Product Details

If you're rebuilding the engine in your Toyota Supra with the B58 engine, this King Engine Bearings Main Bearing Set is a solid option. This set is specifically sized at 0.25mm undersize, meaning it's intended for crankshafts that have been machined down by that amount to clean up wear or damage. King is a well-known name in engine bearings, and they make these to handle the demands of a performance engine.

These bearings are made with a multi-layer material that helps them handle high loads and temperatures. The specific alloy used is designed to work well with various crankshaft materials and oils, helping to ensure a long service life for your rebuilt engine. They fit right into the factory main bearing locations after the crankshaft has been properly machined to the 0.25mm undersize specification.