What does the 0.25mm undersize mean for my engine?

An undersize bearing, like this 0.25mm set, is used when the crankshaft journals have been machined down to correct for wear or damage. This bearing size compensates for that removed material, restoring the correct oil clearance.

What type of engine is this bearing set designed for?

This bearing set is made with a lead-free composite and bi-metal aluminum material, making it ideal for engines that operate under low to medium load conditions.

Does this bearing set come with installation hardware?

This listing is for the main bearing set only. Installation hardware and other related engine components are sold separately.

Specifications

Brand: King Engine Bearings
Part #: MB5278AM0.25
UPC: 611500381072

King Engine Bearings Ford 140Ci /2.3Liter/L4 (Size +0.25mm) Main Bearing Set

Name: King Engine Bearings Ford 140Ci /2.3Liter/L4 (Size +0.25mm) Main Bearing Set
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-ford-140ci-2-3liter-l4-size-0-25mm-mai-t14-770614
Price: 49.48 USD
Availability: BackOrder

$49.48

On Backorder

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Fits 1989-2001 Ford Ranger. King Engine Bearings main bearing set, 0.25mm undersize. Features lead-free composite for low to medium-load engines.

Key Features

Fits 1989-2001 Ford Ranger, 1991-1993 Ford Mustang, 1998-2001 Mazda B2500, and 1985-1989 Merkur XR4Ti.
This is a 0.25mm undersize main bearing set.
Constructed with a lead-free, environmentally safe composite material.
Features a bi-metal aluminum construction.
Ideal 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

Built with a lead-free, environmentally safe composite material, this main bearing set from King Engine Bearings is specifically made for engines that don't see extreme loads. The bi-metal aluminum construction is a solid choice for the 2.3 Liter (140ci) four-cylinder found in your Ford Ranger, Mazda B2500, or other compatible vehicles.

King has been focused on making engine bearings since 1960, aiming to provide the best possible quality. This set is sized at 0.25mm undersize, which is important if you're re-machining your crankshaft to correct for wear. Using the correct bearing size is crucial for maintaining proper oil clearance, which directly impacts oil pressure and engine longevity.