What does the +0.25mm sizing mean for these bearings?

The +0.25mm sizing indicates that these bearings are designed for a crankshaft that has been machined undersize by 0.25mm. This is a common practice during engine rebuilding when crankshaft journals show wear and need to be reground to a standard undersize.

Why are main bearings important in an engine?

Main bearings are crucial for supporting the crankshaft, which is the rotating heart of your engine. They create a low-friction surface that allows the crankshaft to spin smoothly while handling the immense forces generated during combustion.

What happens if I use the wrong size main bearings?

Using main bearings that are not the correct size for your crankshaft can lead to improper oil clearance. This can result in excessive wear, increased friction, potential engine damage, and reduced engine life.

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Specifications

Brand: King Engine Bearings
Part #: MB5701SI0.25
UPC: 611500548970

King Engine Bearings Mitsubishi 4D56 Hp (Size +0.25mm) Main Bearing Set

Name: King Engine Bearings Mitsubishi 4D56 Hp (Size +0.25mm) Main Bearing Set
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-mitsubishi-4d56-hp-size-0-25mm-main-be-t14-770899
Price: 77.21 USD
Availability: BackOrder

$77.21

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Key Features

This is a +0.25mm undersize main bearing set.
Designed for Mitsubishi 4D56 Hp engines.
Supports the crankshaft within the engine block.
Ensures proper oil clearance for reduced friction and wear.

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About this part

Product Details

This is a set of main bearings from King Engine Bearings, specifically sized at +0.25mm for Mitsubishi 4D56 Hp engines. Main bearings are critical components that support the crankshaft within the engine block, allowing it to rotate smoothly while handling significant loads. When rebuilding or repairing an engine, especially if the crankshaft has been machined undersize, using the correct size bearings is essential for proper oil clearance and engine longevity.

King Engine Bearings is known for making well-built engine bearings. This set is made to the +0.25mm undersize specification, meaning it's intended for use when the crankshaft journals have been ground down by 0.25mm. This precise sizing ensures the correct oil film thickness is maintained between the crankshaft and the bearing, which is vital for reducing friction and wear. Using bearings that are too large or too small can lead to rapid engine damage.