Kubota SM-E3B Series Workshop Manual page 118

SM-E3B SERIES WSM
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.
Tilt (A) Allowable limit
Factory spec.
Free length (B)
Allowable limit
(A) Tilt
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.
Factory spec.
Setting load /
Setting length
Allowable limit
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.
Factory spec.
Oil clearance between
rocker arm and rocker
arm shaft
Allowable limit
Rocker arm shaft O.D. Factory spec.
Rocker arm I.D. Factory spec.
S-57
DIESEL ENGINE
1.2 mm
0.047 in.
31.3 to 31.8 mm
1.24 to 1.25 in.
28.4 mm
1.12 in.
(B) Free Length
W11157830
65 N / 27.0 mm
6.6 kgf / 27.0 mm
15 lbf / 1.06 in.
55 N / 27.0 mm
5.6 kgf / 27.0 mm
12 lbf / 1.06 in.
W11177330
0.016 to 0.045 mm
0.00063 to 0.0017 in.
0.15 mm
0.0059 in.
10.473 to 10.484 mm
0.41233 to 0.41275 in.
10.500 to 10.518 mm
0.41339 to 0.41409 in.
W11199710
KiSC issued 03, 2011 A