King Engine Bearings MB 798AM1.0 Main Bearing Set 1.0mm Undersize BMW M20 M50 M52

The King Engine Bearings MB 798AM1.0 is a complete crankshaft main bearing set designed for BMW M20, M50, and M52 inline-six engines. This set is supplied at a 1.0mm undersize, making it ideal for engine rebuilds where the crankshaft has been reground to restore proper journal geometry and oil clearances.

AM-Series Bi-Metal Construction:

• Material: 100% lead-free bi-metal aluminum alloy, equivalent to SAE-783 (K-783 spec) — King's standard aluminum-based material and the softest bi-metal in their lineup
• Application: Engineered for passenger car engines operating under low to medium load conditions, making it the ideal OE replacement choice
• Embeddability: Superior embeddability allows the bearing surface to absorb micro-contaminants, reducing scratching of crank journals and protecting bearing integrity
• Tolerance Control: Precision manufactured to tight tolerances of ±0.0001 in. for an accurate, consistent fit
• Lead-Free: Environmentally safe, lead-free composite construction
• Quantity: Set includes 7 pairs of main bearings

King Engine Bearings AM-Series main bearings are a trusted OE replacement solution for street and marine engine rebuilding applications. The aluminum-based bi-metal construction provides excellent compatibility with factory crankshafts while delivering the precise fit and long service life expected from a quality engine rebuild component.