What does the +0.25mm sizing mean for these main bearings?

The +0.25mm sizing indicates that these bearings are slightly larger than standard. This is used when the engine's crankshaft has been machined down (ground) to a smaller size, and these larger bearings are installed to restore the correct clearance for proper oil flow and support.

Why is a lead-free composite material used in these bearings?

Using a lead-free composite material makes these bearings an environmentally safe option. This material is also chosen for its performance characteristics in engines that don't experience extremely high loads.

Are these bearings suitable for high-performance or racing engines?

These specific bearings are designed for low to medium-load engines. For high-performance or racing applications, you would typically look for bearings with different material compositions and load ratings.

Specifications

Brand: King Engine Bearings
Part #: MB5359AM0.25
UPC: 611500417344

King Engine Bearings Mazda Fe 2.0L (Size +0.25mm) Main Bearing Set

Name: King Engine Bearings Mazda Fe 2.0L (Size +0.25mm) Main Bearing Set
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-mazda-fe-2-0l-size-0-25mm-main-bearing-t14-770657
Price: 40.97 USD
Availability: BackOrder

$40.97

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King Engine Bearings Mazda Fe 2.0L (Size +0.25mm) Main Bearing Set. Main bearings are critical for crankshaft support.

Key Features

Fits Mazda Fe 2.0L engines.
Main bearing set is sized +0.25mm.
Constructed with a lead-free, bi-metal aluminum composite material.
Suitable for low to medium-load engine applications.

⚠️ CA WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Learn more

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About this part

Product Details

This is a set of main bearings from King Engine Bearings, specifically for Mazda Fe 2.0L engines. These bearings are sized +0.25mm, meaning they are slightly larger than standard to accommodate a crankshaft that has been machined to match this size. Main bearings sit between the crankshaft and the engine block, providing a smooth, low-friction surface for the crankshaft to rotate on. They are essential for proper engine lubrication and longevity.

King Engine Bearings specializes in this exact component, and they've been doing it since 1960. This particular set is made from a bi-metal aluminum material, which is a lead-free composite. This makes it an environmentally safe option and it's well-suited for engines that operate under low to medium loads, like many common 2.0L applications. When you're rebuilding an engine, getting the right size bearings is crucial for ensuring the crankshaft has the correct clearance for oil flow and support.