MENTAL CRANK 8973569390 suitable for NPR 700P FVR models equipped with 4HF1 4HE1 4HK1 engines

Design Philosophy

Standard-size crankshaft thrust washer for 4HF1/4HE1 engines. Precision-made with layered alloy construction to control crankshaft end-play and provide a durable, low-friction surface under continuous axial loads.

How It Works

Installed between the crankshaft thrust face and the engine block. The washer maintains a thin oil film that separates metal surfaces, limiting forward-and-backward crankshaft movement while reducing friction and wear.

Problems It Solves

Fixes excessive crankshaft end-play, clutch vibration, and thrust surface wear caused by worn washers. Restores proper crankshaft positioning and prevents costly crankshaft and block damage in NPR/700P/FVR trucks.