ACL Bearings 5M1143-.75 Main Bearing Set Undersize - 0.75mm

ACL Bearings has manufactured precision engine bearings in Tasmania, Australia for over 70 years, serving as a major OEM supplier to the Australian and international automotive industry. The 5M1143-.75 main bearing set is engineered for Mitsubishi engines requiring 0.75mm undersize crankshaft journals, making it ideal for engines with reground crankshafts or specific rebuild applications.

Key Features:

• Bimetal aluminum construction using lead-free bearing material for environmental considerations, replacing older lead-content bearings while maintaining OEM performance standards
• High-strength steel backing with increased tensile strength to improve bearing retention and strength, with increased crush for better retention from higher radial contact pressures and improved heat dissipation
• No flash plating applied to further improve bearing retention and maximize heat transfer
• Increased eccentricity with gradual reduction in wall thickness between crown and parting line, allowing compensation for bore distortion and assisting in hydrodynamic oil film formation
• 0.75mm undersize for reground crankshafts
• Manufactured to exacting tolerances with micron tolerance machining and precision measurement systems for consistent accuracy in wall thickness and crush

ACL produces one of the largest aftermarket ranges of engine bearings with a global reputation for robust metallurgy, quality, precision, innovation and performance, offering both standard duty and heavy-duty Race Series for performance applications. This main bearing set provides reliable OE-replacement quality for Mitsubishi engine rebuilds requiring undersize bearings.