What does the 0.25mm undersize mean for my engine rebuild?

The 0.25mm undersize indicates that these bearings are designed to fit a crankshaft that has been machined down by 0.25mm. This is common when a crankshaft has wear or damage and needs to be resurfaced to a smaller diameter.

Are these bearings suitable for a high-performance engine build?

These bearings feature a lead-free composite and are ideal for low to medium-load engines. For high-performance or high-load applications, you may want to consider bearings with different material specifications.

What is the benefit of a lead-free composite material?

The lead-free composite material is environmentally safe. It's designed to provide good performance in engines that don't experience extreme operating loads, contributing to a more sustainable product.

Specifications

Brand: King Engine Bearings
Part #: MB5528AM0.25
UPC: 611500200311

King Engine Bearings Mazda 626 F8/(Size +0.25mm) Main Bearing Set

Name: King Engine Bearings Mazda 626 F8/(Size +0.25mm) Main Bearing Set
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-mazda-626-f8-size-0-25mm-main-bearing--t14-770781
Price: 52.48 USD
Availability: BackOrder

$52.48

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Fits 1986-1992 Mazda 626. King Engine Bearings main bearing set, 0.25mm undersize. Lead-free composite ideal for low-to-medium load engines.

Key Features

Fits 1986-1992 Mazda 626, 1989-1992 Ford Probe, and 1988-1992 Mazda MX-6.
Main bearing set sized 0.25mm undersize for machined crankshafts.
Constructed with a bi-metal aluminum material.
Features a lead-free composite surface.
Ideal for low to medium-load engines.

⚠️ 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

If you're rebuilding the bottom end of your 1986-1992 Mazda 626, especially with the F8 engine, getting the main bearings right is crucial for a smooth-running, long-lasting engine. These main bearings from King Engine Bearings are designed to be a direct replacement, ensuring proper oil clearance and support for your crankshaft.

King specializes in bearings, and this set is made from a bi-metal aluminum material. It features a lead-free composite that's environmentally safe and works well in engines that aren't under extreme load, like many stock or lightly modified applications. This particular set is 0.25mm undersize, which is important if your crankshaft has been machined to that specification during a rebuild.

When installing, make sure to check your crankshaft journals for the correct size and surface finish. These bearings are a solid option for a reliable engine rebuild.