C3.4B Engines For Caterpillar Built Machines Caterpillar

Illustration 1	g01335203
Typical example

When the valve springs (1) are replaced the valve springs must be replaced in pairs.

The free length for the valve spring ... 44.6 mm (1.75590 inch)

Illustration 2	g01335204

(2) Valve face angle

Inlet ... 30 degrees

Exhaust ... 30 degrees

(3) Valve stem diameter

Inlet ... 7.985 to 8.000 mm (0.31437 to 0.31496 inch)

Exhaust ... 7.985 to 8.000 mm (0.31437 to 0.31496 inch)

Clearance

Clearance of the inlet valve stem ... 0.040 to 0.053 mm (0.00157 to 0.00209 inch)

Clearance

Clearance of the exhaust valve stem ... 0.040 to 0.053 mm (0.00157 to 0.00209 inch)

(4) Length of valve

Inlet valve and exhaust valve ... 132.75 to 133.15 mm (5.22637 to 5.24212 inch)

(5) Valve head

Diameter of inlet valve head ... 41.43 to 41.69 mm (1.63110 to 1.64134 inch)

Diameter of exhaust valve head ... 37.27 to 37.53 mm (1.46732 to 1.47756 inch)