Kubota M108S, Workshop Manual

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1-S57
M108S, WSM ENGINE
Camshaft Alignment
1. Support the camshaft with V block on the surface plate and set a
dial indicator with its tip on the intermediate journal at right angle.
2. Rotate the camshaft on the V blocks and get the misalignment
(half of the measurement).
3. If the misalignment exceeds the allowable limit, replace the
camshaft.
W1064422
Cam Height
1. Measure the height of the cam at its highest point with an outside
micrometer.
2. If the measurement is less than the allowable limit, replace the
camshaft.
W1064551
Oil Clearance of Camshaft Journal
1. Measure the camshaft journal O.D. with an outside micrometer.
2. Measure the cylinder block bore I.D. for camshaft with an inside
micrometer.
3. If the clearance exceeds the allowable limit, replace the
camshaft.
W1064798
Camshaft alignment Allowable limit
0.01 mm
0.0004 in.
Intake and exhaust cam
height
Factory
spec.
Intake
valve 37.63 mm
1.481 in.
Exhaust
valve 38.96 mm
1.534 in.
Allowable
limit
Intake
valve 37.13 mm
1.462 in.
Exhaust
valve 38.46 mm
1.514 in.
Oil clearance of
camshaft journal
Factory spec.
0.050 to 0.091 mm
0.0020 to 0.0035 in.
Allowable limit
0.15 mm
0.0059 in.
Camshaft journal O.D. Factory spec.
45.934 to 45.950 mm
1.8085 to 1.8090 in.
Camshaft bearing I.D. Factory spec.
46.000 to 46.025 mm
1.8111 to 1.8120 in.
KiSC issued 06, 2007 A