Clevite MS-1803A-.25MM Engine Crankshaft Main Bearing Set

The Clevite MS-1803A-.25MM is a precision-engineered crankshaft main bearing set designed for -.25MM undersize applications. This complete bearing set provides reliable protection for your engine's crankshaft journals, ensuring smooth operation and long-term durability.

Key Features:

• 100% lead-free bi-metal aluminum silicon construction for environmental compliance and superior performance
• Contains 60% more silicon than comparable competitive bearings for enhanced wear characteristics
• Advanced silicon content improves journal surface conditioning, reducing break-in time and wear
• Superior seizure resistance protects against catastrophic bearing failure
• Enhanced wear resistance extends bearing and crankshaft service life
• Precision -.25MM undersize for worn or machined crankshafts
• Complete main bearing set for full crankshaft coverage

Clevite bearings are trusted by professional engine builders and mechanics for their consistent quality and dependability. The bi-metal aluminum design combines a strong steel backing with a specialized aluminum alloy bearing surface, delivering the optimal balance of strength and conformability. The increased silicon content in the bearing material creates a harder, more durable surface that better conditions mating journal surfaces during operation, resulting in improved oil film retention and reduced friction.