King Engine Bearings MB5442MC High-Performance Main Bearing Set

The King Engine Bearings MB5442MC is a high-performance main bearing set featuring advanced nano-composite polymer coating technology. Designed for Ford Duratec and Mazda MZR engines including the L3 and L3-VDT variants, this standard-size bearing set delivers enhanced wear resistance and durability in demanding applications.

MC Series Technology:

The MC series bearings feature King's innovative K-340 nano-composite polymer coating applied over a strengthened bi-metal structure consisting of a steel backing and aluminum alloy substrate. This advanced coating provides exceptional protection against metal-to-metal contact, making these bearings especially suitable for modern engines with start-stop technology, higher cylinder pressures, and reduced oil film thickness conditions.

Key Features:

• Nano-composite polymer coating (K-340) for superior wear resistance
• Bi-metal construction with steel back and strengthened aluminum alloy
• 5-10 micron polymer coating applied during manufacturing
• Bull's Eye tolerance with shells matched to 0.0001 inch
• Enlarged, chamfered oil holes for improved lubrication
• Medium eccentricity for optimum load distribution
• Narrowed design for large-radius crankshafts
• Standard size (STD) for OE replacement applications

What's Included:

Complete main bearing set with 5 pairs of precision-matched bearings.

These bearings provide excellent protection for hybrid and start-stop engines that frequently operate under mixed lubrication conditions. The polymer coating does not add additional thickness to the bearing, maintaining original precision wall specifications while significantly extending service life in modern high-performance applications.