King Engine Bearings MB5237AM1.5 Main Bearing Set Mitsubishi Oversize - 4G12 1.5mm

The King Engine Bearings MB5237AM1.5 is a complete main bearing set engineered for Mitsubishi 4G12 inline-four engines. This set features a +1.5mm oversize specification, making it the correct choice when installing on a crankshaft that has been reground to the 1.5mm undersize journal dimension. King Engine Bearings is a globally recognized OEM and aftermarket bearing supplier known for precision manufacturing and tight tolerances.

Key Features:

• Engineered specifically for the Mitsubishi 4G12 inline-4 engine platform
• +1.5mm oversize (AM suffix) — designed for use with reground crankshaft journals
• High-quality aluminum-based bearing alloy for excellent wear resistance and conformability
• Precision-machined to OEM tolerances for proper oil clearance and reliable sealing
• Tri-metal or bi-metal construction provides superior fatigue strength and embedability
• Steel backing ensures dimensional stability and positive housing retention
• Engineered to handle the thermal and mechanical demands of the 4G12 engine
• Complete set includes all main bearing shells required for a full engine rebuild

King Engine Bearings manufactures to ISO-certified quality standards and supplies bearings to OEM assembly lines worldwide. The MB5237AM1.5 is the ideal solution for engine builders performing a professional rebuild on a Mitsubishi 4G12 with a reground crankshaft, ensuring long service life and proper oil film maintenance.