Kubota WSM J Series Workshop Manual page 126

J SERIES, WSM
Free Length and Tilt of Valve Spring
1. Measure the free length (A) of valve spring with venire 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 (B).
Check the entire surface of the valve spring for scratches.
If there is any defect, replace it.
[Z482, D722]
Factory spec.
Free length (A)
Allowable limit
Tilt (B) Allowable limit
[D1005, V1305]
Factory spec.
Free length (A)
Allowable limit
Tilt (B) Allowable limit
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.
[Z482, D722]
Factory spec.
Setting load /
Setting length
Allowable limit
[D1005, V1305]
Factory spec.
Setting load /
Setting length
Allowable limit
S-80
ENGINE
31.3 to 31.8 mm
1.23 to 1.25 in.
28.4 mm
1.12 in.
1.2 mm
0.047 in.
37.0 to 37.5 mm
1.46 to 1.48 in.
36.5 mm
1.44 in.
1.0 mm
0.039 in.
W11157830
64.7 N / 27.0 mm
6.6 kgf / 27.0 mm
14.6 lbs / 1.063 in.
54.9 N / 27.0 mm
5.6 kgf / 27.0 mm
12.3 lbs / 1.063 in.
118 N / 31.0 mm
12.0 kgf / 31.0 mm
26.4 lbs / 1.22 in.
100 N / 31.0 mm
10.2 kgf / 31.0 mm
22.5 lbs / 1.22 in.
W11177330
KiSC issued 10, 2016 A