VALVE ROCKER INLET 8973064210 Suitable for NPR 700P models fitted with 4HK1 6HK1 6HH1 engines

Design Philosophy

Precision-engineered intake rocker arm designed for Isuzu 4HK1/6HK1/6HH1 engines. Made from high-strength alloy steel or cast iron, it serves as a double-arm lever with the rocker shaft as its fulcrum. The short arm features a threaded hole for the valve lash adjusting screw, while the long arm has a curved working face that pushes the intake valve. Its robust construction ensures precise valve timing and reliable power transmission under high-cycle engine loads.

How It works

Mounted on the rocker shaft and driven by the camshaft. When the cam lobe pushes the rocker arm, the arm pivots on the shaft, and its long curved face presses down on the intake valve stem to open the valve. When the cam releases, the valve spring pushes the valve closed, and the rocker arm returns to its resting position. The adjusting screw on the short arm allows precise setting of the valve clearance.

Problems It Solves

Fixes valve timing errors, engine ticking noise, power loss, and increased fuel consumption caused by a worn or bent rocker arm. Restores precise intake valve actuation and ensures reliable engine performance in NPR / 700P / FVR34 / NQR trucks.