Isuzu 8982889401 Camshaft Assembly

This camshaft assembly is engineered for the Isuzu 4JJ1 3.0L four-cylinder turbocharged diesel engine. It features a dual overhead camshaft (DOHC) configuration with separate intake and exhaust camshafts driven by gear/chain mechanism. The component is manufactured from chilled cast iron or alloy steel with induction-hardened lobes and journals to withstand high contact stresses and ensure precise valve lift profiles. Primary applications include hydraulic excavators such as the Case CX130B, Hitachi ZX120 and ZX135US, JCB JS130LC, and Sumitomo SH130-5. It also fits Isuzu NPR series trucks and D-Max pickups equipped with the 4JJ1 engine. The camshaft controls intake and exhaust valve timing events critical for combustion efficiency, emissions compliance, and low-end torque delivery in heavy-duty cycles. Cross-references include Isuzu OEM numbers 8982889401, 8980031293, 8982050371, 8-97328-644-6, 8-97328-642-6, 8982889460, 8-98288940-0, and 8-98003129-3. Installation requires verification of timing marks and valve lash adjustment per Isuzu 4JJ1 service manual specifications (0.15 mm feeler gauge standard).