Timing Gear, Camshaft - Kubota WG972-E2 Workshop Manual

WG972-E2, DF972-E2, WSM

(2) Timing Gear, Camshaft

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
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.
Factory spec.
Oil clearance between
tappet and tappet guide
bore
Allowable limit
Tappet O.D. Factory spec.
Tappet guide bore I.D. Factory spec.
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.
Factory spec.
Backlash between idle
gear and crank gear
Allowable limit
Factory spec.
Backlash between idle
gear and cam gear
Allowable limit
Factory spec.
Backlash between idle
gear and injection pump
gear
Allowable limit
Factory spec.
Backlash between oil
pump drive gear and
crank gear
Allowable limit
S-55
GASOLINE / LPG ENGINE
0.25 mm
0.0098 in.
W10292900
0.016 to 0.052 mm
0.00063 to 0.00205 in.
0.10 mm
0.0039 in.
17.966 to 17.984 mm
0.70732 to 0.70803 in.
18.000 to 18.018 mm
0.70866 to 0.70937 in.
W1063847
0.043 to 0.124 mm
0.00169 to 0.00488 in.
0.15 mm
0.0059 in.
0.047 to 0.123 mm
0.00185 to 0.00484 in.
0.15 mm
0.0059 in.
0.046 to 0.124 mm
0.00181 to 0.00488 in.
0.15 mm
0.0059 in.
0.041 to 0.123 mm
0.00161 to 0.00484 in.
0.15 mm
0.0059 in.
W1064048
KiSC issued 01, 2006 A