OEM-quality Part No. 4999939 Standard Main Bearing Set, interchangeable with 4999940 and 2873959, is designed for Cummins ISZ, QSZ, Z13, ISX12 and QSX11.9 heavy-duty engines. Precision-machined from high-grade leaded bronze alloy with a wear-resistant overlay, it delivers exceptional load capacity, friction reduction and long service life, maintaining precise crankshaft clearance for optimal engine performance.

PN NAME QTY
4999939 MAIN BEARING 7
4999940  MAIN BEARING 7
2873959  CRANKSHAFT THRUST BEARING 4

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