What does '0.25mm undersize' mean for these bearings?

This means the bearings are manufactured to be 0.25mm smaller in diameter than a standard size bearing. They are used when the engine's crankshaft journals have been machined down by 0.25mm to correct wear or imperfections.

What is the construction of these main bearings?

These bearings feature a bimetal construction, which uses an aluminum base. This type of construction is common for main bearings and is designed to provide good wear resistance and load-carrying capacity.

Are these bearings suitable for a stock engine rebuild?

These bearings are suitable for engine rebuilds, especially when the crankshaft has been machined to a 0.25mm undersize. Always consult your engine's service manual for specific bearing size recommendations during a rebuild.

Specifications

Brand: King Engine Bearings
Part #: MB7008AM0.25
UPC: 611500321016

King Nissan 122CI 2.0L RB24 / 152CI 2.5L RB25DE/RB25DET/RB25DETT (Size 0.25mm) Main Bearing Set

Name: King Nissan 122CI 2.0L RB24 / 152CI 2.5L RB25DE/RB25DET/RB25DETT (Size 0.25mm) Main Bearing Set
Brand: King Engine Bearings
SKU: king-engine-bearings-king-nissan-122ci-2-0l-rb24-152ci-2-5l-rb25de-rb25det-rb25d-t14-4382707
Price: 77.00 USD
Availability: BackOrder

$77.00

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

King Nissan 122CI 2.0L RB24 / 152CI 2.5L RB25DE/RB25DET/RB25DETT (Size 0.25mm) Main Bearing Set. For engine rebuilds needing a 0.25mm undersize.

Key Features

Main bearing set for Nissan RB20 and RB30 engines.
Features a bimetal construction with an aluminum base.
This set is 0.25mm undersize for use with machined crankshaft journals.
Designed for engine rebuilding applications.

Secure CheckoutFast Shipping631-982-0042

About this part

Product Details

When you're rebuilding the bottom end of your Nissan RB20 or RB30 engine, getting the main bearings right is crucial for proper crankshaft support and oil pressure. This set from King Engine Bearings is built with a bimetal construction, featuring an aluminum base, which is a common and effective material for these applications. They are designed to handle the demands of these well-known Nissan inline-six engines.

This specific set is sized 0.25mm undersize, meaning it's intended for use when the crankshaft journals have been machined down by that amount to clean them up or correct wear. King is a popular choice for engine builders because they offer a solid option for reliable engine performance. Installing these bearings correctly, with proper lubrication and torque specifications, is key to ensuring your engine runs smoothly and lasts.