hitachi — Valve Clearance Adjustment

OPERATIONAL PERFORMANCE TEST / Engine Test Adjustment: If the measurement results are out of specification, adjust the valve clearance in the same order of measurement. IMPORTANT: Touch the bridge to the end of valve heads (2 used) horizontally and ad- just the valve clearance carefully. 1. Loosen the lock nuts (12 used) and adjusting screws (12 used), which secure the bridge and rocker arm. 2. Insert a thickness gauge into the clearance be- tween rocker arm and bridge cap. 3. Tighten the adjusting screw of rocker arm until condition for the thickness gauge is proper. 4. Tighten the lock nut of rocker arm. Adjusting Screw Rocker Arm T1V1-04-03-002 : 22 N m (2.2 kgf m, 16.2 lbf ft) 5.

Tighten the adjusting screw of bridge until the bridge comes in contact with the valve head. 6. Tighten the lock nut of bridge. Lock Nut Bridge Bridge Cap : 22 N m (2.2 kgf m, 16.2 lbf ft) 7. Check the valve clearance after the lock nuts are tightened. T1V1-04-03-003 Valve Head Bridge T4-3-6