3406E and 3456 Industrial Engines Caterpillar

Illustration 1	g00859782

(1) Valve rocker arm assembly

(2) Valve lash

Inlet valves ... 0.38 ± 0.08 mm (0.015 ± 0.003 inch)

Exhaust valves ... 0.76 ± 0.08 mm (0.030 ± 0.003 inch)

Note: After the valve lash is set, tighten the adjusting screw locknut to a torque of 30 ± 7 N·m (22 ± 5 lb ft). Then recheck the valve lash.

(3) Rocker arm shaft

Diameter of a new rocker arm shaft ... 40.000 ± 0.010 mm (1.5748 ± 0.0004 inch)

Diameter of a new rocker arm ... 40.065 ± 0.015 mm (1.5774 ± 0.0006 inch)

Bearing clearance between rocker arm and shaft ... 0.040 to 0.090 mm (0.0016 to 0.0035 inch)

(4) Valve bridge assembly

(5) Camshaft

(6) Tighten bolts to 109 ± 15 N·m (80 ± 11 lb ft).