King Engine Bearings MB5428SI Main Bearing Set Honda Bimetal - R18A1

The King Engine Bearings MB5428SI is a complete main bearing set designed for the Honda R18A1 engine. Engineered to OEM specifications, these bearings provide reliable crankshaft support and precise oil film control to maintain proper engine operation and longevity.

King Engine Bearings is a globally recognized manufacturer of precision engine bearings, known for producing high-quality replacements that meet or exceed original equipment standards. The MB5428SI features a bimetal construction with an aluminum-silicon base layer, offering excellent load capacity, corrosion resistance, and wear characteristics suited for both daily drivers and performance applications.

Key Features:

• Complete main bearing set for the Honda R18A1 engine
• Bimetal construction — aluminum-silicon base for superior strength and durability
• Precision-machined to exacting tolerances for optimal oil clearance
• Excellent resistance to fatigue, corrosion, and wear
• Designed to meet or exceed OEM specifications
• Direct replacement for worn or damaged factory main bearings

The aluminum-silicon alloy overlay provides strong conformability and embeddability, helping the bearing adapt to minor surface irregularities and absorb small contaminant particles — key factors in extending crankshaft and engine life. This set is a trusted choice for engine rebuilders and professional mechanics working on Honda R18A1-equipped vehicles.