S-57
SM-E2B SERIES, WSM
DIESEL ENGINE
Free Length and Tilt of Valve Spring
1. Measure the free length (B) of valve spring with vernier calipers.
If the measurement is less than the allowable limit, replace it.
2. Put the valve spring on a surface plate, place a square on the
side of the valve spring.
3. Check to see if the entire side is in contact with the square.
Rotate the valve spring and measure the maximum tilt (A).
If the measurement exceeds the allowable limit, replace it.
4. Check the entire surface of the valve spring for scratches.
If there is any defect, replace it.
W11157830
Valve Spring Setting Load
1. Place the valve spring on a tester and compress it to the same
length it is actually compressed the engine.
2. Read the compression load on the gauge.
3. If the measurement is less than the allowable limit, replace it.
W11177330
Oil Clearance between Rocker Arm and Rocker Arm Shaft
1. Measure the rocker arm shaft O.D. with an outside micrometer.
2. Measure the rocker arm I.D. with an inside micrometer, and then
calculate the oil clearance.
3. If the oil clearance exceeds the allowable limit, replace the rocker
arm and measure the oil clearance again. If it still exceeds the
allowable limit, replace also the rocker arm shaft.
W11199710
Tilt (A) Allowable limit
1.2 mm
0.047 in.
Free length (B)
Factory spec.
31.3 to 31.8 mm
1.232 to 1.252 in.
Allowable limit
28.4 mm
1.118 in.
(A) Tilt (B) Free Length
Setting load /
Setting length
Factory spec.
64.7 N / 27.0 mm
6.6 kgf / 27.0 mm
14.6 lbs / 1.063 in.
Allowable limit
54.9 N / 27.0 mm
5.6 kgf / 27.0 mm
12.3 lbs / 1.063 in.
Oil clearance between
rocker arm and rocker
arm shaft
Factory spec.
0.016 to 0.045 mm
0.00063 to 0.00177 in.
Allowable limit
0.15 mm
0.0059 in.
Rocker arm shaft O.D. Factory spec.
10.473 to 10.484 mm
0.41232 to 0.41276 in.
Rocker arm I.D. Factory spec.
10.500 to 10.518 mm
0.41339 to 0.41410 in.
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