King Engine Bearings MB5540AM0.75 AM-Series Main Bearing Set Oversize - 0.75mm

The King Engine Bearings MB5540AM0.75 is a bi-metal aluminum main bearing set engineered for Isuzu 4XC1/T and 4XE1W engines. This set is sized at +0.75mm oversize, making it the correct choice during engine rebuilds where the crankshaft journals have been machined undersize to restore a proper sealing surface.

This bearing set uses King's AM-Series (K-783) aluminum alloy construction, a standard bi-metal design with a steel backing and an aluminum bearing surface that meets SAE-783 material specifications. The AM-Series is well-suited for low to medium load engines, including street and marine applications.

Key Features:

• AM-Series Bi-Metal Construction: Steel-backed with an aluminum alloy bearing surface equivalent to SAE-783 specification
• +0.75mm Oversize: Designed for use with crankshafts that have been reground 0.75mm undersize
• Superior Embeddability: Aluminum alloy material absorbs and traps macro-particles to help protect crankshaft journals from scratching and wear
• 100% Lead-Free: Environmentally responsible and user-safe formulation
• Tight Tolerance Control: Wall thickness tolerances held to +/- .0001 inch for precise oil clearance
• Recommended Applications: Street and marine engine rebuilds operating under low to medium load conditions

King Engine Bearings has specialized exclusively in engine bearings since 1960, producing a comprehensive range for automotive, light and heavy-duty truck, marine, and aviation applications. Every King bearing is manufactured under one roof, allowing precise quality control from raw material to finished product.