What does 0.25mm oversized mean for these bearings?

This means the bearings are slightly larger than standard size. They are intended for use when the crankshaft journals have been machined down by 0.25mm to clean up wear or imperfections. This ensures a proper fit and oil clearance after the crankshaft has been reconditioned.

What is the ACL high-performance overlay material?

ACL's high-performance overlay is a specialized coating designed for increased durability and better oil retention. It offers improved wear resistance while still allowing for the embedding of small contaminants, which helps protect the crankshaft surface.

Do these bearings come with installation instructions?

While specific installation instructions are not included with the bearings themselves, it is highly recommended to refer to the manufacturer's official service manual for your specific vehicle. Proper installation is critical for engine longevity.

ACL Mitsubishi 4G63/4G64 6 Bolt 1st Gen DSM 0.25mm Oversized High Performance Main Bearing Set

Specifications

Brand: ACL
Part #: 5M1144H-.25
UPC: 9315726182093

ACL Mitsubishi 4G63/4G64 6 Bolt 1st Gen DSM 0.25mm Oversized High Performance Main Bearing Set

Name: ACL Mitsubishi 4G63/4G64 6 Bolt 1st Gen DSM 0.25mm Oversized High Performance Main Bearing Set
Brand: ACL
SKU: acl-acl-mitsubishi-4g63-4g64-6-bolt-1st-gen-dsm-0-25mm-oversized-high-performanc-t14-13008
Price: 109.59 USD
Availability: InStock

$109.59

Only 3 left in stock

ACL 0.25mm oversized main bearing set for Mitsubishi 4G63/4G64 6 bolt engines. High performance bearings for engine rebuilds.

Key Features

Fits 1971-1992 Dodge Colt, 1990-1992 Dodge Ram 50, 1989-1990, 1992 Eagle Summit, 1989-1991 Hyundai Sonata, 1983-1988 Mitsubishi Cordia, 1990-1992, 1995-1999 Mitsubishi Eclipse, 1992 Mitsubishi Expo, 1985-1987 Mitsubishi Galant, 2005-2006 Mitsubishi Lancer, 1984-1992 Mitsubishi Mighty Max, 1985-1988 Mitsubishi Mirage, 1983-1988 Mitsubishi Tredia, 1987-1990 Mitsubishi Van, 1976-1980 Plymouth Arrow, 1979-1982 Plymouth Champ, 1983-1990, 1992 Plymouth Colt, 1990-1992 Plymouth Laser, 1978-1979 Plymouth Sapporo, and 1978-1979 Dodge Challenger.
Main bearing set is 0.25mm oversized for use with machined crankshafts.
Features ACL's high-performance overlay material for improved wear resistance and oil film strength.
Designed to handle increased loads and temperatures common in performance engine builds.
Helps maintain proper oil clearance and lubrication for critical engine components.

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Will this fit your vehicle?

Product Details

When you're rebuilding a Mitsubishi 4G63 or 4G64 6-bolt engine, getting the right bearings is crucial for long-term health. This set from ACL is 0.25mm oversized, meaning it's designed to be used when the crankshaft journals have been machined down by that amount to clean them up. ACL uses a special overlay material that's built tough to handle the demands of performance engines, offering a solid balance between wear resistance and the ability to embed small debris particles, which helps prevent scoring.

These main bearings are a popular choice for DSM (Diamond-Star Motors) builds, especially for the first-generation Eclipse, Laser, and Summit models. The material composition is designed to maintain oil film strength under higher loads and temperatures than stock bearings. This is important because a strong oil film is what keeps your rotating assembly from seizing under stress.

If you're already planning on machining your crankshaft, this 0.25mm oversized set is the perfect fit to ensure a snug and properly lubricated fit. Make sure to check your crankshaft's specifications after machining to confirm this is the correct size you need for your engine build.