ACL Bearings 4M1747P-40 Main Bearing Set Undersize - 0.40mm

The ACL Bearings 4M1747P-40 is a precision-engineered main bearing set designed for engines requiring 0.40mm (approximately 0.016 inch) undersize bearings. This configuration is specifically manufactured for crankshafts that have been reground to remove wear, scoring, or damage, restoring proper bearing clearances and engine performance.

Key Features:

• 0.40mm undersize for reground crankshaft journals
• Duraglide (P-series) construction with high-quality trimetal metallurgy
• Precision machined to exacting tolerances for consistent wall thickness and proper crush fit
• Manufactured in Tasmania, Australia with over 70 years of bearing production expertise
• Suitable for standard-duty replacement applications
• Meets or exceeds OEM specifications for fit and performance

ACL Bearings are trusted by engine builders worldwide for their robust metallurgy, precision manufacturing, and reliability. The undersize designation allows proper fitment on crankshafts that have been machined below standard dimensions, ensuring optimal oil clearance and engine longevity. Always verify crankshaft journal dimensions before installation to confirm proper bearing size selection.