Kubota WSM STa-30, Workshop Manual

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1-S39
ST
α
-30 · ST
α
-35, WSM ENGINE
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.
W1031532
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 a cylinder
gauge, and calculate the oil clearance.
3. If the oil clearance exceeds the allowable limit, replace the
camshaft.
W1031662
(C) Piston and Connecting Rod
Piston Pin Bore I.D.
1. Measure the piston pin bore I.D. in both the horizontal and
vertical directions with a cylinder gauge.
2. If the measurement exceeds the allowable limit, replace the
piston.
W1031817
Cam height of intake
Factory spec.
33.90 mm
1.3346 in.
Allowable limit
33.85 mm
1.3327 in.
Cam height of exhaust
Factory spec.
33.90 mm
1.3346 in.
Allowable limit
33.85 mm
1.3327 in.
Oil clearance of
camshaft journal
Factory spec.
0.050 to 0.091 mm
0.00197 to 0.00358 in.
Allowable limit
0.15 mm
0.0059 in.
Camshaft journal O.D. Factory spec.
39.934 to 39.950 mm
1.57221 to 1.57284 in.
Cylinder block bore I.D. Factory spec.
40.000 to 40.025 mm
1.57480 to 1.57579 in.
Piston pin bore I.D.
Factory spec.
25.000 to 25.013 mm
0.98425 to 0.98476 in.
Allowable limit
25.05 mm
0.9862 in.
KiSC issued 11, 2006 A