King Engine Bearings MB 524AM0.75 Main Bearing Set for Mitsubishi 4G63 - 0.75mm Undersize

The King Engine Bearings MB 524AM0.75 is an OE-replacement crankshaft main bearing set designed for the Mitsubishi 4G63 engine. This set is sized at 0.75mm undersize, making it the correct choice for engines with crankshafts that have been reground to the 0.75mm undersize specification. The set includes 5 pairs of main bearing shells to complete a full engine rebuild.

Part of King's AM Series, these bearings use a lead-free, aluminum-based bi-metal construction — the softest material in King's lineup and an ideal match for passenger car engines operating under low to medium loads. The lead-free composite is both environmentally responsible and safe to handle during installation.

Key Features:

• OE Replacement Grade — designed as a direct, drop-in replacement for factory crankshaft main bearings
• AM Series Bi-Metal Construction — aluminum-based material, the softest bi-metal in King's bearing range
• Lead-Free Formula — environmentally safe composite material suitable for modern engine rebuilds
• 0.75mm Undersize — engineered for crankshafts reground to 0.75mm undersize specification
• 5 Pairs Included — complete set covering all main journals for the Mitsubishi 4G63
• Superior Embeddability — helps protect crank journals by absorbing macro-particle contaminants rather than allowing them to score bearing surfaces
• Tight Tolerance Control — shells matched to within ±0.0001 inch for precise oil clearance

King Engine Bearings has been a trusted name in precision engine bearings since 1960, supplying high-quality components to the OEM, performance, and engine rebuilding markets. The MB 524AM0.75 is the correct oversize replacement for any 4G63 rebuild requiring 0.75mm undersized main bearings.