Main Bearing 0.00 8973720760 suitable for NPR models equipped with 4HF1 4HG1 4HK1 engines

Design Philosophy

Standard-size crankshaft bearing for 4HF1/4HG1/4HK1 engines. Precision-made with layered alloy construction to provide a durable, low-friction surface that supports the crankshaft under high combustion loads.

How It Works

Installed between crankshaft main journals and engine block. The bearing maintains a thin oil film that separates metal surfaces, reducing friction and wear while carrying the crankshaft's rotating load.

Problems It Solves

Fixes crankshaft knocking, low oil pressure, and bearing seizure caused by worn or damaged bearings. Restores proper crankshaft clearance and prevents costly crankshaft damage in NPR trucks.