C6.6 Industrial Engine Caterpillar

Illustration 1	g01927355
Typical example (1) Exhaust valve spring (2) Inlet valve spring

When the valve springs are replaced the valve springs must be replaced in pairs.

Refer to table 1 and table 2 for information on the length of the valve spring and the load of the valve spring.

Note: The free length for the inlet valve spring is 40.65 mm (1.60039 inch).

Note: The free length for the exhaust valve spring is 52.73 mm (2.07598 inch).

Illustration 2	g01927357
Typical example

(3) Valve face angle

Inlet ... 30 degrees

Exhaust ... 45 degrees

(4) Valve stem diameter

Inlet ... 6.970 to 6.985 mm (0.2744 to 0.2750 inch)

Exhaust ... 6.945 to 6.960 mm (0.2734 to 0.2740 inch)

Clearance

Maximum clearance of the inlet valve stem ... 0.05 mm (0.0020 inch)

The service limit for the inlet valve stem ... 0.08 mm (0.0031 inch)

Clearance

Maximum clearance of the exhaust valve stem ... 0.075 mm (0.00295 inch)

The service limit for the exhaust valve stem ... 0.10 mm (0.00394 inch)

(5) Length of valve

Inlet valve ... 109.82 to 110.27 mm (4.32361 to 4.34133 inch)

Exhaust valve ... 109.853 to 110.303 mm (4.32491 to 4.34263 inch)

(6) Valve head

Diameter of inlet valve head ... 35 mm (1.37795 inch)

Diameter of exhaust valve head ... 33 mm (1.2992 inch)