King Engine Bearings MB 524AM1.5 AM-Series Main Bearing Set +1.5mm Oversize

The King Engine Bearings MB 524AM1.5 is an OE-replacement crankshaft main bearing set designed for the Mitsubishi 4G63 engine. This set is part of King's AM Series — a bi-metal, aluminum-based bearing line engineered for reliable, long-lasting performance in passenger car engines. The 1.5mm oversize designation makes this set suitable for engines with reground or undersize crankshaft journals requiring additional material compensation.

Key Features:

• AM Series Bi-Metal Construction: Utilizes King's standard aluminum-based material — the softest bi-metal in their lineup — providing excellent conformability and embeddability for OE-style rebuilds
• Superior Embeddability: Helps absorb macro-particles to reduce scratching of crank journals and protect bearing surfaces from premature wear
• Lead-Free Material: 100% lead-free aluminum silicon alloy construction, meeting modern environmental and safety standards
• Tight Tolerance Control: Wall thickness matched to within ±0.0001 inches for precise oil clearance and consistent performance
• +1.5mm Oversize: Designed for use with crankshaft journals ground 1.5mm undersize; ideal for engine rebuilds requiring journal correction
• Complete Set: Includes 5 pairs of main bearing shells to cover all main journal positions in the 4G63 engine
• OE Replacement Grade: Well-suited for street-driven and marine-use applications with low to medium engine loads

King Engine Bearings has been a trusted name in precision engine components since 1960, and the AM Series reflects their commitment to quality OE-equivalent replacement parts. The MB 524AM1.5 is the ideal choice for a dependable, professional-grade engine rebuild on the Mitsubishi 4G63 platform.