ACL Bearings 4M1701P-30 Main Bearing Set Undersize - 0.030

The ACL Bearings 4M1701P-30 is a precision-engineered main bearing set designed for diesel engine rebuilds requiring 0.030 inch undersize bearings. This complete set provides the essential crankshaft support needed for a professional engine overhaul.

Key Features:

• Tri-metal construction with hardened steel backing for superior strength and durability
• Precision-manufactured to exacting tolerances for proper oil clearances
• Aluminum-tin bearing material optimized for diesel engine applications
• 0.030" undersize for reground crankshafts
• OEM-quality replacement metallurgy and specifications
• Enhanced load capacity and wear resistance

ACL has manufactured precision engine bearings in Tasmania, Australia for over 70 years, earning a global reputation for quality and innovation. Each bearing set replicates original equipment specifications while incorporating modern metallurgy advances. The tri-metal design features a steel back bonded to an aluminum-tin bearing surface, providing excellent conformability, embedability, and seizure resistance critical for diesel engine reliability.

When replacing main bearings, always verify crankshaft journal dimensions and ensure proper oil clearances are achieved during installation. Consult your engine manual for torque specifications and assembly procedures.