King Engine Bearings MB5429SI0.25 Main Bearing Set Undersize Nissan - 0.25mm YD22 YD25

The King Engine Bearings MB5429SI0.25 is a precision-engineered main bearing set designed specifically for Nissan YD22 and YD25 diesel engines. This set features King's SI-Series bi-metal construction with aluminum-silicon alloy, providing the ideal balance of strength and reliability for OE replacement applications.

Key Features:

• 0.25mm undersize bearing specification for reground crankshafts
• Bi-metal construction with 2.5-3% silicon-aluminum alloy for enhanced strength
• 100% lead-free design for environmental safety and user protection
• Complete main bearing set includes 5 pairs for full engine rebuild
• Optimized for medium-load engines with nodular cast iron crankshafts
• Precision tolerance control up to ±0.0001 inch for proper fitment
• Improved crankshaft finish compatibility reduces microscopic wear

King's SI-Series bearings are specifically engineered for aftermarket gasoline and diesel engine rebuilding, making them the perfect choice for performance engines using factory crankshafts. The silicon-strengthened aluminum alloy provides superior durability and wear resistance compared to standard aluminum bearings, while maintaining excellent embeddability to protect crankshaft journals. These bearings are ideal for engines that have had their crankshafts turned down 0.25mm during rebuilding.