C3.4B Engines for Caterpillar Built Machines Caterpillar

Illustration 1	g02842156
Typical example

(1) Inlet rocker arm

Diameter of the rocker arm bore ... 19.020 to 19.041 mm (0.74882 to 0.74964 inch)

(2) Exhaust rocker arm

Diameter of the rocker arm bore ... 19.020 to 19.041 mm (0.74882 to 0.74964 inch)

Clearance

Maximum clearance of both the rocker arm bores. ... 0.020 to 0.054 mm (0.00079 to 0.00213 inch)

(3) Diameter of the rocker shaft ... 18.979 to 19.000 mm (0.74720 to 0.74803 inch)

Illustration 2	g02681778
Tightening sequence

Tighten the fasteners in the sequence that is in illustration 2. Tighten the fasteners to an initial torque. ... 7 N·m (62 lb in)

Tighten the fasteners in the sequence that is in illustration 2. Tighten the fasteners to a final torque. ... 13 N·m (115 lb in)