What does the +0.5 sizing mean for these bearings?

The +0.5 sizing indicates that these bearings are 0.020 inches larger than standard size. This is typically used when the crankshaft journals have been machined undersize during an engine rebuild to ensure proper clearance.

What type of engine load are these bearings best suited for?

These bearings feature a lead-free composite and bi-metal aluminum construction, making them ideal for engines that operate under low to medium load conditions.

Are these bearings compatible with all Mazda 323 models?

This specific bearing set is listed for Mazda 323 models from 1986 to 1994. Always verify your specific vehicle's engine and year range against the full fitment data to ensure compatibility.

Specifications

Brand: King Engine Bearings
Part #: MB5304AM0.5
UPC: 611500405587

King Engine Bearings Kia/Mazda DOHC 16 Valve/SOHC 16 Valve/SOHC 8 Valve (Size +0.5) Main Bearing Set

Name: King Engine Bearings Kia/Mazda DOHC 16 Valve/SOHC 16 Valve/SOHC 8 Valve (Size +0.5) Main Bearing Set
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-kia-mazda-dohc-16-valve-sohc-16-valve--t14-280159
Price: 29.45 USD
Availability: BackOrder

$29.45

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King Engine Bearings main bearing set for Kia/Mazda DOHC/SOHC engines. Lead-free composite for reliable engine performance.

Key Features

Fits a wide range of Kia, Mazda, Ford, Mercury, and Escort/Tracer/Capri vehicles.
Main bearing set is +0.5mm (0.020 inches) undersize.
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

If you're rebuilding the bottom end of your engine, getting the main bearings right is crucial for smooth operation and longevity. This main bearing set from King Engine Bearings is designed for a range of Kia, Mazda, Ford, and Mercury vehicles with DOHC or SOHC 8 or 16-valve engines.

These bearings are made with a bi-metal aluminum material and feature a lead-free composite that's environmentally safe. This construction makes them ideal for engines that operate under low to medium loads, offering a well-built option for your rebuild. The set is sized +0.5, meaning it's 0.020 inches larger than standard, which is important for engines that have had their crankshaft journals machined.

When installing, always refer to the manufacturer's service manual for the correct torque specifications and procedures to ensure proper seating and performance of these bearings.