ACL Bearings 5M1139A-.75 Main Bearing Set Undersize - 0.75mm

The ACL Bearings 5M1139A-.75 is a high-quality main bearing set engineered for Mitsubishi 4-cylinder engines displacing 1995cc to 2555cc, including the G52 and G54B engine families commonly found in 1978-1990 applications. This bearing set features a 0.75mm undersize dimension, designed specifically for reground crankshafts that have been machined 0.75mm below standard specifications.

Key Features:

• High-strength aluminum silicon alloy construction for superior durability
• Precision-engineered half groove design for optimal oil distribution
• 0.75mm undersize specification for professionally reground crankshafts
• Manufactured in Tasmania, Australia using advanced metallurgy techniques
• Suitable for both OEM replacement and performance engine rebuilds

ACL has maintained a global reputation for over 70 years, producing precision engine bearings for both OEM and aftermarket applications. The "A" designation in this part number indicates the use of high-strength aluminum silicon material, providing excellent wear resistance and load-carrying capacity. This complete main bearing set includes all necessary bearings for a full crankshaft installation and is compatible with engines using flanged thrust main bearings.