What does the +0.75mm size mean for these bearings?

The +0.75mm designation indicates that these bearings are 0.75mm larger in diameter than standard size. This means they are intended for use when the crankshaft journals have been machined down by 0.75mm during an engine rebuild to ensure a proper fit and oil clearance.

What is the construction of these bearings?

These bearings feature a bimetal construction, which means they are made from two different metal layers. They have an aluminum base, a common material for modern engine bearings due to its good thermal conductivity and conformability.

Are these bearings a direct replacement for all Mazda 626 main bearings?

This specific set, MB5225AM0.75, is an optional replacement for MB5528AM bearings when the flange is standard size. It's important to confirm the exact bearing type and size needed for your specific engine build, especially if you are not performing a full crankshaft machining.

Specifications

Brand: King Engine Bearings
Part #: MB5225AM0.75
UPC: 611500239335

King Engine Bearings Mazda 626 F8 (Size +0.75mm) Main Bearing Set

Name: King Engine Bearings Mazda 626 F8 (Size +0.75mm) Main Bearing Set
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-mazda-626-f8-size-0-75mm-main-bearing--t14-770542
Price: 55.54 USD
Availability: BackOrder

$55.54

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Fits 1986-1992 Mazda 626. King Engine Bearings main bearing set, size +0.75mm. Essential for engine rebuilds.

Key Features

Fits 1986-1992 Mazda 626, 1989-1992 Ford Probe, and 1988-1992 Mazda MX-6.
Main bearing set for the Mazda F8 engine.
Size is +0.75mm, intended for use with a machined crankshaft.
Features a bimetal construction with an aluminum base for improved performance.
Designed to reduce friction and wear on the crankshaft and engine block.

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About this part

Product Details

If you're rebuilding the engine in your 1986-1992 Mazda 626 with the F8 engine, this Main Bearing Set from King Engine Bearings is what you'll need. These bearings are crucial for the smooth rotation of your crankshaft within the engine block. They sit between the crankshaft journals and the engine block, reducing friction and wear.

This particular set is sized at +0.75mm, meaning they are designed for a crankshaft that has been machined down by 0.75mm during an engine rebuild. The bearings themselves are constructed with a bimetal design, featuring an aluminum base. This construction helps manage heat and reduce friction, contributing to the longevity of your engine's rotating assembly.

This set is an optional replacement for MB5528AM bearings, specifically when the flange is standard size. Always ensure your crankshaft journals are properly machined and measured to the correct undersize before installing these bearings.