What does the +0.50mm sizing mean for these bearings?

The +0.50mm sizing indicates that these bearings are larger than the standard size. They are intended for use in an engine where the crankshaft and/or main housing bore has been machined (ground or bored) to be 0.50mm larger than factory specifications.

Are these bearings suitable for a daily driver or only for racing?

These are King's pmax black racing line bearings, featuring a tri-metal compound designed for higher performance and increased loads. While they can be used in a daily driver if the engine has been rebuilt to accommodate them, they are optimized for racing applications.

What other parts are typically replaced when installing main bearings?

When replacing main bearings, it's common practice to also replace the connecting rod bearings (also known as 'rod bearings') and the engine's oil pump. It's also essential to ensure the crankshaft is in good condition and properly machined to the correct size for the new bearings.

Specifications

Brand: King Engine Bearings
Part #: MB5278XP0.5
UPC: 611500577932

King Engine Bearings Ford 140Ci /2.3Liter/L4 (Size +0.50mm) Main Bearing Set

Name: King Engine Bearings Ford 140Ci /2.3Liter/L4 (Size +0.50mm) Main Bearing Set
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-ford-140ci-2-3liter-l4-size-0-50mm-mai-t14-770618
Price: 191.36 USD
Availability: BackOrder

$191.36

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Fits 1989-2001 Ford Ranger. King Engine Bearings main bearing set, size +0.50mm. High-performance racing bearings for your engine rebuild.

Key Features

Fits 1989-2001 Ford Ranger, 1991-1993 Ford Mustang, 1998-2001 Mazda B2500, and 1985-1989 Merkur XR4Ti with the 2.3L engine.
Main bearing set sized at +0.50mm, intended for engines that have been machined to this larger diameter.
Features King's pmax black tri-metal racing material for improved performance under demanding conditions.
Designed for the Ford 140 cubic inch / 2.3 Liter L4 engine.

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Will this fit your vehicle?

About this part

Product Details

If you're rebuilding the engine in your 1989-2001 Ford Ranger, especially if you're aiming for improved performance, a solid set of main bearings is crucial. This set from King Engine Bearings is designed for the Ford 140 cubic inch, 2.3-liter four-cylinder engine and comes at a +0.50mm size, meaning they're intended for an engine block that has been machined to a larger diameter. These are the pmax black racing line bearings, offering a step up in performance for those who push their engines harder.

King Engine Bearings is known for its well-built components, and this racing line set is no exception. The pmax black material is a tri-metal compound that's built for the demands of higher RPMs and increased loads often found in performance applications. Because these are a +0.50mm size, they are specifically for engines that have already been bored out to accommodate them. Make sure your machine shop has prepared the crankshaft and block to this specific size before installing these bearings.

This set is a direct fit for the Ford Ranger, Mazda B2500, Ford Mustang (1991-1993), and Merkur XR4Ti (1985-1989) with the 2.3L engine. Ensure your engine's main journals have been machined to the +0.50mm size to properly fit these bearings.