What does the 0.25mm undersize mean for these bearings?

The 0.25mm undersize specification means these bearings are designed to be used with a crankshaft that has had its main journals machined down by 0.25mm. This is typically done to remove wear or damage from the original journals.

What is the construction of these main bearings?

These bearings are made with a bimetal construction, featuring an aluminum base. This material is chosen for its ability to handle the loads and heat generated during engine operation.

Do these bearings come with installation hardware?

This listing is for the main bearing set only. Installation hardware, such as main cap bolts, is not included and should be sourced separately if needed.

Specifications

Brand: King Engine Bearings
Part #: MB535AM1.25
UPC: 611500165658

King Engine Bearings Toyota 2A/3A/4A/(Size +0.25mm) Main Bearing Set

Name: King Engine Bearings Toyota 2A/3A/4A/(Size +0.25mm) Main Bearing Set
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-toyota-2a-3a-4a-size-0-25mm-main-beari-t14-770665
Price: 33.48 USD
Availability: BackOrder

$33.48

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Fits 1983-1997 Toyota Corolla. King Engine Bearings main bearing set, 0.25mm undersize, for 2A/3A/4A engines.

Key Features

Fits 1983-1997 Toyota Corolla, 1990-1993 Toyota Celica, and 1980-1988 Toyota Tercel.
Designed for Toyota 2A, 3A, and 4A engine applications.
Main bearing set with a 0.25mm undersize specification.
Constructed with a bimetal aluminum base for reliable performance.
Supports the crankshaft in the engine block for proper rotation.

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About this part

Product Details

If you're rebuilding the bottom end of your 1983-1997 Toyota Corolla with a 2A, 3A, or 4A engine, a fresh set of main bearings is crucial. These bearings sit between your crankshaft and the engine block, supporting the rotating assembly and handling the immense forces generated during combustion. Getting this critical interface right is key to a long-lasting rebuild.

This set from King Engine Bearings uses a bimetal construction with an aluminum base, a common and effective material for handling the loads and heat in these engines. They are manufactured to a 0.25mm undersize, meaning they are intended for use when the crankshaft journals have been machined down by 0.25mm to clean up wear or damage. This ensures a proper fit and oil clearance when paired with a reconditioned crankshaft.

Proper installation is key with any bearing set. Always refer to your vehicle's service manual for the correct torque specifications and procedures when installing these main bearings.