King Engine Bearings MB5510AM1.5 AM-Series Main Bearing Set 1.5mm Undersize for Mazda E3 E5

The King Engine Bearings MB5510AM1.5 is an AM-Series crankshaft main bearing set designed as a direct OE replacement for Mazda E3 and E5 engines. This set is sized at 1.5mm undersize, making it an ideal solution for engine rebuilds where the crankshaft journals have been machined beyond standard sizing.

The AM-Series employs King's standard aluminum-based bi-metal material, equivalent to SAE-783, formulated for low to medium load passenger car engines. The aluminum alloy construction delivers excellent embeddability, allowing microscopic debris and macro-particles to embed harmlessly into the bearing surface rather than scoring the crankshaft journals.

Key Features:

• AM-Series Bi-Metal Construction: Standard aluminum-based material (SAE-783 equivalent) for reliable OE-replacement performance in low and medium load engines
• Superior Embeddability: Reduces scratching of crank journals and protects against tearing or weakening of Babbitt overlays
• Lead-Free Material: Environmentally friendly and user-safe formulation
• Bull's Eye Tolerance™ Technology: King's proprietary production process combining precision machining, overplating, and computerized wall thickness monitoring for tolerances within ±0.0001"
• 1.5mm Undersize: Designed for crankshafts that have been ground 1.5mm under standard journal diameter
• Complete Set: Includes 5 pairs of main bearing shells to service the full crankshaft

King Engine Bearings has been manufacturing precision engine bearings since 1960 and is a trusted name in automotive, marine, and aviation applications. The AM-Series is recommended for street and marine engine rebuilds requiring dependable OE-level performance.