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Connecting Rod Bearing +0.50mm Cummins 3901172 | 4932376, 3901232, A77467
Ensure optimal engine performance and reliable crankshaft rotation with this premium +0.50mm oversize connecting rod bearing for Cummins 4BT, 6BT, and ISB/QSB engines. Precision-engineered to meet strict dimensional standards, it is the perfect choice for engine overhauls and crankshaft regrinds.
Description
High-Performance Connecting Rod Bearing (+0.50mm Oversize) for Cummins Engines
Restore your engine’s bottom-end reliability with this premium +0.50mm (.020″) oversize connecting rod bearing. Designed specifically for Cummins B-series engines, this bearing shell is engineered to compensate for crankshaft journal regrinding during major engine overhauls. It provides a precise oil clearance, reduces friction, and ensures smooth power transfer from the piston to the crankshaft under heavy-duty operating conditions.
Key Features & Benefits
- Precision Engineering: Manufactured to exact dimensional tolerances to ensure perfect fitment and optimal oil film thickness.
- Heavy-Duty Durability: Constructed from high-strength tri-metal materials to withstand extreme combustion pressures and high RPMs.
- Crankshaft Protection: Ideal for engines undergoing a crankshaft regrind to +0.50mm, restoring factory-spec clearances.
Technical Specifications
- Oversize: +0.50 mm (.020 in)
- Standard Journal Diameter: 68.986 – 69.011 mm (2.7160″ – 2.7170″)
- Housing Bore: 72.986 – 73.012 mm
- Width: 31.10 mm
- Lock Style: Opposite side locks
Application & Fitment Notes
This connecting rod bearing is compatible with a wide range of industrial, agricultural, and automotive diesel engines, including:
- Cummins Engines: 4B 3.9, 4BT 3.9, 4BTA 3.9, 6B 5.9, 6BT 5.9, 6BTA 5.9, ISB, QSB
- Komatsu Engines: S6D102
- Case IH Equipment: Various tractors and industrial machinery utilizing Cummins B-series engines
Important Installation Note:
For engines with non-fracture split connecting rods, this bearing (3901172) is typically used for both the upper and lower shells. For engines with fracture-split connecting rods, use 3901172 as the upper shell and 4892796 as the lower shell. Please verify your connecting rod type and crankshaft journal dimensions before ordering. Unpacked bearings or those showing signs of installation are not eligible for return.
