Isuzu 8941523440 Rocker Arm Assembly

The rocker arm assembly transmits camshaft motion to the intake and exhaust valves on Isuzu 4JG2, 4JG1, and 4JB1 series diesel engines. The assembly comprises a forged steel rocker arm body, hardened alloy steel shaft, and precision bushings designed for high-cycle fatigue resistance in heavy-duty applications. Technical specifications include a rocker shaft run-out limit of 0.2 mm (0.008 in) and eight-valve configuration (two valves per cylinder) for the 3.1L four-cylinder engine. The shaft features precision surface grinding for wear resistance and stable valve train operation. OEM cross-references include rocker arm 8941523440 and rocker shaft 8941523460. Primary applications cover Hitachi DX40 and DX45 series mini excavators, JCB and Doosan construction machinery, plus Isuzu NKR, NPR, TFR light trucks and Bighorn/Trooper SUVs equipped with the 4JG2 powerplant.