WASHER 4855506 - Caterpillar

Valve Spring
Free Length and Tilt of Valve Spring
Illustration 7 g02914376
Measure the free length (B) of valve spring with calipers. If the measurement is less than the allowable limit, replace it.
Put the valve spring on a surface plate, and put a square on the side of the valve spring. Turn the valve spring to measure the maximum tilt (A). If the measurement is more than the allowable limit, replace it.
Table 5
Tilt (A) Allowable limit 1.0 mm (0.039 inch)
Table 6
Free length (B) Factory specification Intake valve 35.1 to 35.6 mm (1.39 to 1.40 inch)
Exhaust valve 35.1 to 35.6 mm (1.39 to 1.40 inch)
Allowable limit Intake valve 34.6 mm (1.36 inch)
Exhaust valve 34.6 mm (1.36 inch) Setting Load of Valve Spring
Illustration 8 g02914377
Put the valve spring on a tester and compress the valve spring to the specified setting length.
Read the compression load on the gauge.
Table 7
Setting load / Setting length Factory specification Intake valve 63.5 N / 31.5 mm (14.3 lbf / 1.24 inch)
Exhaust valve 63.5 N / 31.5 mm (14.3 lbf / 1.24 inch)
Allowable limit Intake valve 45.9 N / 31.5 mm (10.3lbf / 1.24 inch)
Exhaust valve 45.9 N / 31.5 mm (10.3lbf / 1.24 inch)
If the measurement is less than the allowable limit, replace the valve spring. Oil Clearance Between Tappet and Tappet Guide Bore
Illustration 9 g02914378
Measure the tappet O.D. with an external micrometer.
Measure the tappet guide bore I.D. with a cylinder gauge.
Calculate the oil clearance.
Table 8
Oil Clearance between tappet and guide bore Factory specification 0.020 to 0.062 mm (0.00079 to 0.0024 inch)
Allowable limit 0.07 mm (0.003 inch)
Table 9
Tappet outside diameter Factory specification 23.959 to 23.980 mm (0.94327 to 0.94409 inch)
Tappet guide bore inside diameter Factory specification 24.000 to 24.021 mm (0.94489 to 0.94570 inch)
If the oil clearance is more than the allowable limit or the tappet has a damage, replace the tappet. Valve Face Angle
Illustration 10 g02807476
(A) Valve Face Angle
Table 10
Valve face angle Intake 0.60 to 0.80 mm (0.024 to 0.031 inch)
Exhaust 0.85 to 1.05 mm (0.0335 to 0.0413 inch)
Table 11
Allowable limit Intake 1.2 mm (0.047 inch)
Exhaust 1.2 mm (0.047 inch)