Kubota M5640SU Workshop Manual page 137

M5640SU, M5640DT-SU, 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).
Check the entire surface of the valve spring for scratches.
If there is any defect, replace it.
Factory spec.
Free length (B)
Allowable limit
Tilt (A) 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 in 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.
Push Rod Alignment
1. Place the push rod on V blocks.
2. Measure the push rod alignment.
3. If the measurement exceeds the allowable limit, replace the
push rod.
Push rod alignment Allowable limit
1-S49
ENGINE
41.7 to 42.2 mm
1.65 to 1.66 in.
41.2 mm
1.62 in.
1.0 mm
0.039 in.
(B) Free Length
9Y1210365ENS0048US0
118 N / 35 mm
12.0 kgf / 35 mm
26.5 lbf / 1.4 in.
100.0 N / 35 mm
10.2 kgf / 35 mm
22.5 lbf / 1.4 in.
9Y1210365ENS0049US0
0.016 to 0.045 mm
0.00063 to 0.0017 in.
0.10 mm
0.0039 in.
13.973 to 13.984 mm
0.55012 to 0.55055 in.
14.000 to 14.018 mm
0.55119 to 0.55188 in.
9Y1210365ENS0050US0
0.25 mm
0.0098 in.
9Y1210365ENS0051US0
KiSC issued 07, 2009 A