wsm Kubota L4100, Workshop Manual

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ENGINE L4100, WSM
1-S45
(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.
9Y1210278ENS0112US0
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.
9Y1210278ENS0068US0
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.
9Y1210278ENS0069US0
Valve spring tilt (A) Allowable limit
1.0 mm
0.039 in.
Valve spring free length
(B)
Factory specification
41.7 to 42.2 mm
1.65 to 1.66 in.
Allowable limit
41.2 mm
1.62 in.
(A) Tilt (B) Free Length
Setting load /
Setting length
Factory specification
117.6 N / 35.0 mm
12.0 kgf / 35.0 mm
26.4 lbf / 1.3780 in.
Allowable limit
100 N / 35.0 mm
10.2 kgf / 35.0 mm
22.5 lbf / 1.3780 in.
Oil clearance between
rocker arm and rocker
arm shaft
Factory specification
0.016 to 0.045 mm
0.00063 to 0.0017 in.
Allowable limit
0.10 mm
0.0039 in.
Rocker arm shaft O.D. Factory specification
13.973 to 13.984 mm
0.55012 to 0.55055 in.
Rocker arm I.D. Factory specification
14.000 to 14.018 mm
0.55119 to 0.55188 in.
KiSC issued 08, 2012 A