Installation Instructions

81700·82100·82400 WSM,11770
(2) Timing Gears and Camshaft
1 ENGINE
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 gear.
4. If the oil clearance is proper, replace the gear.
Factory spec.
0.032toO.115mm
Crank gear 0.00120 to 0.00453 in.
Idle gear
Allowable limit
0.15 mm
0.0059 in.
Factory spec.
0.036toO.114mm
Idle~
0.00142 to 0.00449 in.
Cam gear
Allowable limit
0.15 mm
0.0059 in.
Factory spec.
0.034toO.116 mm
Idle gear 0.00134 to 0.00457 in.
Injection
0.15mm
pump gear Allowable limit
0.0059 in.
Injection Factory spec.
0.033toO.117mm
pump gear
0.00130toO.00461 in.
Governor
Allowable limit
0.15 mm
gear 0.0059 in.
8177P054
(1) Idle Gear
8177P055
(1) Camshaft
(2) Idle Gear Collar
(2) Cam Gear
Idle Gear Side Clearance
1. Measure the clearance between the idle gear (1) and the idle
gear collar
with a dial gauge.
2. If the clearance exceeds the allowable limit, replace the idle
gear collar
(2).
Factory spec.
0.20toO.51 mm
0.0079 to 0.0201 in.
Side clearance
Allowable limit
0.9mm
0.0354 in.
Camshaft Side Clearance
1. Pull the cam gear (2) with the camshaft (1) to its end.
2. Measure the clearance between the cam gear (2) and the
camshaft stopper.
3. If the clearance exceeds the allowable limit, replace the
camshaft stopper.
Factory spec.
0.07 to 0.22 mm
0.0028 to 0.0087 in.
Side clearance
Allowable limit
0.30 mm
0.0118 in.
1-535