King Engine Bearings MB5661SI0.25 Main Bearing Set Oversized - 0.25mm

The King Engine Bearings MB5661SI0.25 is a precision-engineered main bearing set designed specifically for Audi and Volkswagen engines with ADZ, AWT, APK, BHP, BPY, and AKS engine codes. This complete crankshaft main bearing set provides reliable performance for engine rebuilding and restoration applications.

Key Features:

• Bi-metal construction with silicon aluminum base material, strengthened by 2.5-3% silicon for medium load engines and nodular cast iron crankshafts
• 0.25mm (0.010") oversized bearing dimensions for precision crankshaft grinding applications
• 100% lead-free aluminum silicon composition for environmentally friendly operation
• Advanced aluminum alloy formulation engineered for OE replacement engines operating under medium-load conditions
• Improved oil clearance design to reduce wear and increase engine life while reducing operating noise, vibration, and excess oil flow

Every King bearing utilizes the highest quality materials and the most advanced designs to ensure complete customer satisfaction. The SI Series improves on conventional bi-metal bearings by incorporating a unique aluminum alloy with tin and 3% silicone, providing enhanced durability and wear resistance. Silicon helps to prevent seizure in mixed lubrication conditions and diminishes ferrite peaks on nodular cast iron crankshaft surfaces.

This bearing set is ideal for engine rebuilders and technicians performing precision rebuilds on Audi and VW 1.6L, 1.8L, and 2.0L engines. The oversized design accommodates crankshafts that have been ground 0.25mm undersize for wear or damage repair.