What does 'undersize' mean for a main bearing?

An undersize bearing is manufactured to be slightly smaller than the standard size. This is necessary when the crankshaft journals have been machined down, typically to correct for wear or damage. The 'AL30' in the part number indicates it is 0.030 inches undersize.

Why are main bearings important?

Main bearings are crucial components in an engine's bottom end. They support the crankshaft within the engine block, allowing it to rotate smoothly while handling significant loads and friction. Proper oil clearance is essential for their function and longevity.

Does this bearing come with a set?

This listing is for an individual main bearing. If you are rebuilding an engine, you will typically need a complete set of main bearings, which usually includes multiple individual bearings.

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Specifications

Brand: Clevite
Part #: MB2580AL30
UPC: 027067596642

Clevite Individual Main Bearings

Name: Clevite Individual Main Bearings
Brand: Clevite
SKU: clevite-clevite-individual-main-bearings-t14-57721
Price: 28.56 USD
Availability: BackOrder

$28.56

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Clevite main bearings, part# MB2580AL30. Clevite is known for engine bearings.

Key Features

This is an individual main bearing, part number MB2580AL30.
It is 0.030 inches undersize, intended for use with machined crankshafts.
Clevite is a popular brand for engine bearings.

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About this part

Product Details

Clevite is a well-known name in engine components, especially for their robust engine bearings. This individual main bearing, part number MB2580AL30, is designed to meet the demanding needs of engine rebuilding. When you're putting an engine back together, the main bearings are critical for supporting the crankshaft and ensuring smooth rotation. This part is built to handle the pressures and friction inherent in engine operation.

This specific main bearing is an undersize bearing, meaning it's 0.030 inches smaller than standard. This sizing is important for applications where the crankshaft journals have been machined down to correct for wear or damage. Using the correct undersize bearing ensures a proper fit and optimal oil clearance, which is essential for bearing longevity and engine health. Clevite bearings are a solid option for engine rebuilds where reliability is key.