What does the +0.25mm sizing mean for my engine build?

The +0.25mm sizing indicates that these bearings are intended for a crankshaft that has been machined down by 0.25mm. This is typically done to account for wear on the original crankshaft or to achieve specific, tighter oil clearances during an engine rebuild. Using these bearings on a standard-sized crankshaft will result in incorrect oil clearances.

What material are these main bearings made from?

These main bearings are constructed from a tri-metal material. This type of bearing material is known for its durability and ability to withstand the high loads and operating temperatures found in internal combustion engines.

Do these bearings come with installation hardware?

This set includes the main bearings themselves. It is recommended to consult the manufacturer's installation guide or a service manual for any additional hardware or specific installation procedures required for your Subaru engine.

Specifications

Brand: King Engine Bearings
Part #: MB5234SI0.25
UPC: 611500623493

King Engine Bearings Subaru Ej20/Ej22/Ej25 (Incl. Turbo) (Size +0.25mm) Main Bearing Set

Name: King Engine Bearings Subaru Ej20/Ej22/Ej25 (Incl. Turbo) (Size +0.25mm) Main Bearing Set
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-subaru-ej20-ej22-ej25-incl-turbo-size--t14-770578
Price: 54.71 USD
Availability: BackOrder

$54.71

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King Engine Bearings Subaru EJ20/EJ22/EJ25 Main Bearing Set. Size +0.25mm. Direct fit.

Key Features

Main bearing set for Subaru EJ20, EJ22, and EJ25 engines, including turbocharged models.
Bearings are sized +0.25mm, intended for use with a crankshaft machined to a 0.25mm undersize.
Constructed with a tri-metal material for improved strength and wear resistance.
Helps maintain proper oil clearances for smooth crankshaft operation.

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About this part

Product Details

If you're rebuilding the bottom end of your Subaru EJ20, EJ22, or EJ25 engine, whether it's naturally aspirated or turbocharged, a solid set of main bearings is crucial for long-term reliability. These main bearings from King Engine Bearings are designed to be a direct replacement for your stock bearings, but with an important difference: they are sized at +0.25mm, meaning they are intended for use with a crankshaft that has been machined down by 0.25mm to account for wear or to achieve specific clearances.

King Engine Bearings uses a tri-metal material construction, which is well-known for its strength and ability to handle the high loads and temperatures found in performance engines. This material helps to reduce friction and wear, ensuring that your crankshaft spins smoothly within the engine block. The +0.25mm sizing is critical; using these bearings on an unmachined crankshaft will result in incorrect oil clearances, potentially leading to premature engine failure. Always ensure your crankshaft has been properly measured and machined to the correct undersize before installing these bearings.