What does the 0.25mm undersize mean for these main bearings?

The 0.25mm undersize specification means these bearings are intended for a crankshaft that has been machined down by 0.25mm. This is common during engine rebuilds when the crankshaft has been worn or damaged and needs to be resurfaced.

What is the advantage of a bimetal aluminum base bearing?

Bimetal bearings with an aluminum base are popular because they offer good embeddability, meaning they can conform to minor imperfections. They also have good corrosion resistance and are compatible with a wide range of engine oils.

Are these bearings compatible with standard size crankshafts?

No, these bearings are specifically 0.25mm undersize. They will not fit a standard size crankshaft. You must ensure your crankshaft has been machined to the 0.25mm undersize specification for proper fitment and engine function.

King Engine Bearings Isuzu 4Xc1/T/4Xe1W (Size +0.25mm) Main Bearing Set

Specifications

Brand: King Engine Bearings
Part #: MB5540AM0.25
UPC: 611500202414

King Engine Bearings Isuzu 4Xc1/T/4Xe1W (Size +0.25mm) Main Bearing Set

Name: King Engine Bearings Isuzu 4Xc1/T/4Xe1W (Size +0.25mm) Main Bearing Set
Brand: King Engine Bearings
Price: 39.33 USD
Availability: InStock

$39.33

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Fits 1985-1989 Isuzu I-Mark. King Engine Bearings Main Bearing Set, 0.25mm undersize. Essential for engine rebuilds.

Key Features

Fits 1985-1989 Isuzu I-Mark, 1985-1988 Chevrolet Spectrum, 1989 Geo Spectrum, 1990-1991 Isuzu Impulse, and 1991 Isuzu Stylus.
This is a main bearing set, designed to support the crankshaft within the engine block.
Features a bimetal construction with an aluminum base, offering good compatibility with engine oils.
The set is sized 0.25mm undersize, intended for use with a crankshaft machined to this specific dimension.
Manufactured by King Engine Bearings, a well-known name in engine components.

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Will this fit your vehicle?

Product Details

Built with an aluminum base, these main bearings are a bimetal design, which is a solid choice for the 4XC1/T and 4XE1W engines found in vehicles like the 1985-1989 Isuzu I-Mark. When you're rebuilding an engine, the main bearings are critical because they support the crankshaft and allow it to spin smoothly within the engine block. This set is specifically sized at 0.25mm undersize, meaning it's intended for crankshafts that have been machined down to match this dimension during a rebuild.

King Engine Bearings uses a bimetal construction with an aluminum base for these main bearings. This type of material is well-known for its good compatibility with various oil types and its ability to handle the loads placed on the crankshaft. Ensuring your crankshaft has the proper support from well-made bearings is key to a long-lasting engine rebuild. This set is designed to fit right into the specified Isuzu engines, making the installation process straightforward for a mechanic.

If you're in the process of rebuilding your engine, this set of main bearings is a necessary component. Make sure to confirm your crankshaft has been machined to the 0.25mm undersize specification before ordering, as these bearings are not a direct fit for a standard-sized crankshaft.