Kubota B1830, Workshop Manual, Page: 157 / 548

ENGINE B1830,B2230,B2530,B3030, WSM
1-S56
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.
9Y1210003ENS0087US0
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.
9Y1210003ENS0088US0
(2) Idle Gear and 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.
9Y1210003ENS0089US0
Push rod alignment Allowable limit
0.25 mm
0.0098 in.
Oil Clearance between
tappet and tappet guide
bore
Factory specification
0.020 to 0.062 mm
0.0008 to 0.0024 in.
Allowable limit
0.07 mm
0.0028 in.
Tappet O.D. Factory specification
19.959 to 19.980 mm
0.7858 to 0.7866 in.
Tappet guide bore I.D. Factory specification
20.000 to 20.021 mm
0.7874 to 0.7882 in.
Backlash between idle
gear 1 and crank gear
Factory specification
0.032 to 0.115 mm
0.0013 to 0.0045 in.
Allowable limit
0.15 mm
0.0059 in.
Backlash between idle
gear 1 and cam gear
Factory specification
0.036 to 0.114 mm
0.0014 to 0.0045 in.
Allowable limit
0.15 mm
0.0059 in.
Backlash between idle
gear 1 and injection
pump gear
Factory specification
0.034 to 0.116 mm
0.0013 to 0.0046 in.
Allowable limit
0.15 mm
0.0059 in.
Idle gear 1 and idle gear
2
Factory specification
0.033 to 0.117 mm
0.0013 to 0.0046 in.
Allowable limit
0.15 mm
0.0059 in.
KiSC issued 05, 2012 A