Kubota WSM STa-30, Workshop Manual

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1-S37
ST
α
-30 · ST
α
-35, WSM ENGINE
Oil Clearance between Tappet and Tappet Guide Bore
1. Measure the tappet O.D. with an outside micrometer.
2. Measure the I.D. of the tappet guide bore with a cylinder gauge,
and calculate the oil clearance.
3. If the oil clearance exceeds the allowable limit or the tappet is
damaged, replace the tappet.
W1029366
(B) Timing Gears, Camshaft and Fuel Camshaft
Timing Gear Backlash
1. Set a dial indicator (lever type) with its tip on the gear tooth.
2. Move the gear to measure the backlash, holding its mating gear.
3. If the backlash exceeds the allowable limit, check the oil
clearance of the shafts and the gear.
4. If the oil clearance is proper, replace the gear.
W1029564
Idle Gear Side Clearance
1. Set a dial indicator with its tip on the idle gear.
2. Measure the side clearance by moving the idle gear to the front
and rear.
3. If the measurement exceeds the allowable limit, replace the idle
gear collar.
W1029843
Oil Clearance between
tappet and tappet guide
bore
Factory spec.
0.020 to 0.062 mm
0.00079 to 0.00244 in.
Allowable limit
0.07 mm
0.0028 in.
Tappet O.D. Factory spec.
23.959 to 23.980 mm
0.94327 to 0.94410 in.
Tappet guide bore I.D. Factory spec.
24.000 to 24.021 mm
0.94488 to 0.94571 in.
Backlash between idle
gear and crank gear
Factory spec.
0.0415 to 0.1122 mm
0.00163 to 0.00442 in.
Allowable limit
0.15 mm
0.0059 in.
Backlash between idle
gear and cam gear
Factory spec.
0.0415 to 0.1154 mm
0.00163 to 0.00454 in.
Allowable limit
0.15 mm
0.0059 in.
Backlash between idle
gear and injection pump
gear
Factory spec.
0.0415 to 0.1154 mm
0.00163 to 0.00454 in.
Allowable limit
0.15 mm
0.0059 in.
Backlash between crank
gear and oil pump gear
Factory spec.
0.0415 to 0.1090 mm
0.00163 to 0.00429 in.
Allowable limit
0.15 mm
0.0059 in.
Idle gear side clearance
Factory spec.
0.12 to 0.48 mm
0.0047 to 0.0189 in.
Allowable limit
0.9 mm
0.0354 in.
KiSC issued 11, 2006 A