What does it mean for the bearings to be 0.25mm undersize?

This means the inner diameter of the bearings is slightly smaller than standard. This size is used when the crankshaft journals have been machined down (ground undersize) during a previous engine rebuild or repair. The undersize bearing ensures a proper fit on the prepared crankshaft.

What is the ACL Race Series?

The ACL Race Series represents a line of engine bearings designed with enhanced durability and performance in mind. They are built to withstand higher stresses and temperatures often found in performance or rebuilt engines.

Do I need to buy anything else to install these main bearings?

When rebuilding an engine, you will typically need a new oil pump, oil filter, and engine oil. It is also highly recommended to replace the main bearing cap bolts and follow the manufacturer's service manual for precise installation procedures and torque specifications.

Specifications

Brand: ACL
Part #: 7M7989H-.25
UPC: 9315726250945

ACL 93-98 Toyota 6 4477cc Standard .25mm Oversized Race Series Main Bearing Set

Name: ACL 93-98 Toyota 6 4477cc Standard .25mm Oversized Race Series Main Bearing Set
Brand: ACL
SKU: acl-acl-93-98-toyota-6-4477cc-standard-25mm-oversized-race-series-main-bearing-s-t14-4378713
Price: 286.53 USD
Availability: BackOrder

$286.53

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1993-1997 Toyota Land Cruiser main bearings by ACL. This set is 0.25mm undersize for a reliable engine rebuild.

Key Features

Fits 1993-1997 Toyota Land Cruiser and 1996-1997 Lexus LX450.
Main bearing set for the 4477cc 1FZ-FE engine.
Each bearing is 0.25mm (0.010 inches) undersize for use with reground crankshafts.
ACL Race Series construction for improved durability.
Helps maintain proper oil pressure and reduce friction in the engine.

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About this part

Product Details

When you're rebuilding the heart of your 1993-1997 Toyota Land Cruiser or 1996-1997 Lexus LX450, the main bearings are critical. This ACL Race Series set is built to handle the demands of the 4.477L 1FZ-FE engine. Each bearing in this set is precisely machined to be 0.25mm (0.010 inches) undersize, which is important for engines that have had their crankshaft journals ground down during a previous rebuild or repair. This undersize ensures a proper, snug fit on the prepared crankshaft, which is essential for maintaining oil pressure and reducing friction.

ACL has a solid reputation for making well-built engine components. These main bearings are designed for performance and durability, making them a solid choice for anyone looking to ensure their engine rebuild is done right. When installing, always refer to the manufacturer's service manual for the correct torque specifications and procedures to ensure optimal performance and longevity of your new bearings.