COVER AS 4Z6473 - 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.
Table 1
The load for the inlet valve spring The length of the inlet valve spring
161.5 to 178.5 N (36.30682 to 40.12859 lb) 31.5 mm (1.2402 inch)
337.9 to 373.5 N (75.96330 to 83.96654 lb) 21.5 mm (0.84646 inch) Note: The free length for the inlet valve spring is 40.65 mm (1.60039 inch).
Table 2
The load for the exhaust valve spring The length of the exhaust valve spring
285 to 315 N (64.07085 to 70.81515 lb) 31.5 mm (1.2402 inch)
408.5 to 451.5 N (91.83488 to 101.50172 lb) 22.3 mm (0.87795 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 degreesExhaust ... 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)