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

The +0.25mm sizing indicates that these bearings are intended for use when the crankshaft main journals have been machined down by 0.25mm. This is a common practice during engine rebuilding to ensure a proper fit with worn or resurfaced journals.

What type of engine is this bearing set best suited for?

This bearing set features a lead-free composite and bi-metal aluminum construction, making it ideal for engines that experience low to medium loads. It's a solid option for many common passenger car engines.

Are these bearings environmentally friendly?

Yes, these bearings utilize a lead-free composite material. This is an updated approach for environmental safety, aligning with modern manufacturing standards.

Specifications

Brand: King Engine Bearings
Part #: MB5304AM0.25
UPC: 611500389580

King Kia/Mazda DOHC 16 Valve/SOHC 16 Valve/SOHC 8 Valve (Size +0.25) Main Bearing Set

Name: King Kia/Mazda DOHC 16 Valve/SOHC 16 Valve/SOHC 8 Valve (Size +0.25) Main Bearing Set
Brand: King Engine Bearings
SKU: king-engine-bearings-king-kia-mazda-dohc-16-valve-sohc-16-valve-sohc-8-valve-siz-t14-280158
Price: 29.45 USD
Availability: BackOrder

$29.45

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King Kia/Mazda DOHC 16 Valve/SOHC 16 Valve/SOHC 8 Valve (Size +0.25) Main Bearing Set. Features lead-free composite for low to medium-load engines.

Key Features

Fits various Kia, Mazda, Ford, and Mercury models.
Main bearing set sized at +0.25mm.
Constructed with a bi-metal aluminum material.
Features a lead-free, environmentally safe composite.
Suitable 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

This product is a King Engine Bearings Main Bearing Set, specifically sized at +0.25mm. You get the main bearings needed to rebuild or service the crankshaft main journals on a variety of vehicles. These bearings are constructed with a bi-metal aluminum material and feature a lead-free composite that's environmentally safe, making them ideal for low to medium-load engines. They are designed to fit a range of vehicles, including models like the Mazda Miata, Kia Rio, and Ford Escort.

King Engine Bearings has been specializing in engine bearings since 1960, focusing on supplying well-built components. This set uses an updated composite material that is lead-free, which is a notable change for environmental safety. The bi-metal construction provides a solid foundation for the crankshaft, and the +0.25mm sizing indicates these are intended for engines where the main journals have been machined to this specific undersize during a rebuild.