King Engine Bearings MB 547AM1.25 Main Bearing Set Toyota 18R 1.25mm Oversize

The King Engine Bearings MB 547AM1.25 is an OE-replacement bi-metal main bearing set designed for the Toyota 18R engine, supplied in a 1.25mm oversize to accommodate reground or worn crankshafts during engine rebuilds.

This set includes 5 pairs of main bearings constructed using King's aluminum-based bi-metal material — the softest and most conformable alloy in King's bearing lineup. The lead-free aluminum composite is engineered for passenger car engines operating under low to medium load conditions, offering an environmentally responsible alternative to traditional lead-based bearing materials without sacrificing performance or durability.

Key Features:

• OE Replacement Grade: Direct drop-in fitment for Toyota 18R engine applications
• 1.25mm Oversize: Engineered for use with reground crankshafts at the 1.25mm undersize specification
• Bi-Metal Aluminum Construction: Lead-free aluminum-based material optimized for low-to-medium load passenger car engines
• 5-Pair Set: Complete main bearing set included — upper and lower shells for all main journals
• Environmentally Safe: Lead-free composite meets modern environmental standards while maintaining optimal bearing performance
• OEM-Quality Tolerances: Precision manufactured to ensure correct oil clearance, press fit, and hydrodynamic lubrication

King Engine Bearings has been a trusted name in engine bearing manufacturing since 1960, supplying precision bearings for automotive, marine, aviation, and motorsport applications worldwide. The MB 547AM series is available in multiple sizes from standard through 1.5mm oversize to cover a full range of engine rebuild specifications.