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Home >> GMC >> 1981 >> Forward Control 4.8L Eng VIN T, Standard Trans >> Repair and Diagnosis (Single Page) >> Engine Mechanical >> Mechanical >> 4.1 L & 4.8L 6-Cylinder Engines >> Valves >> Hydraulic Valve Lifter Adjustment

Hydraulic Valve Lifter Adjustment

Rotate engine until rotor is at number 1 cylinder position. With engine at this position, adjust intake valves 1, 2, and 4 and exhaust valves 1, 3 and 5. Back off rocker arm nuts until lash is felt, then tighten nut until all lash is removed and tighten 1 full additional turn. Now rotate engine until rotor is at number 6 position. Following same procedure, adjust intake valves 3, 5 and 6 and exhaust valves 2, 4 and 6.