Kubota G23, Workshop Manual

Page: 129 / 343

ENGINE
G23, G26, WSM
1-S47 (EU)
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.
[G23]
[G26]
9Y1210294ENS0058US0
Valve Spring Setting Load
1. Place the valve spring on a tester and compress it to the same
length it is actually compressed in the engine.
2. Read the compression load on the gauge.
3. If the measurement is less than the allowable limit, replace it.
[G23]
[G26]
9Y1210294ENS0059US0
Tilt
(A)
Allowable limit
1.2 mm
0.047 in.
Free length
(B)
Factory specification
31.3 to 31.8 mm
1.24 to 1.25 in.
Allowable limit
28.4 mm
1.12 in.
Tilt
(A)
Allowable limit
1.0 mm
0.039 in.
Free length
(B)
Factory specification
37.0 to 37.5 mm
1.46 to 1.47 in.
Allowable limit
36.5 mm
1.44 in.
(A) Tilt (B) Free Length
Setting load /
Setting length
Factory specification
65 N / 27.0 mm
6.6 kgf / 27.0 mm
15 lbf / 1.06 in.
Allowable limit
55 N / 27.0 mm
5.6 kgf / 27.0 mm
12 lbf / 1.06 in.
Setting load /
Setting length
Factory specification
117.4 N / 31.0 mm
11.97 kgf / 31.0 mm
26.39 lbf / 1.22 in.
Allowable limit
100.0 N / 31.0 mm
10.20 kgf / 31.0 mm
22.48 lbf / 1.22 in.
KiSC issued 08, 2009 A