ENGINE
B2650HSDC, B3350HSDC, WSM
1-S49
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.
9Y1210822ENS0089US0
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.
9Y1210822ENS0090US0
(2) Timing Gears, Camshaft and Governor Gear
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.
9Y1210822ENS0091US0
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
0.00079 to 0.0024 in.
Allowable limit
0.07 mm
0.003 in.
Tappet O.D. Factory specification
19.959 to 19.980 mm
0.78579 to 0.78661 in.
Tappet guide bore I.D. Factory specification
20.000 to 20.021 mm
0.78740 to 0.78822 in.
Backlash between idle
gear 1 and crank gear
Factory specification
0.0320 to 0.115 mm
0.00126 to 0.00452 in.
Allowable limit
0.15 mm
0.0059 in.
Backlash between idle
gear 1 and cam gear
Factory specification
0.0360 to 0.114 mm
0.00142 to 0.00448 in.
Allowable limit
0.15 mm
0.0059 in.
Backlash between idle
gear 1 and injection
pump gear
Factory specification
0.0340 to 0.116 mm
0.00134 to 0.00456 in.
Allowable limit
0.15 mm
0.0059 in.
(equipped with idle gear
2) Backlash between idle
gear 1 and idle gear 2
Factory specification
0.0330 to 0.117 mm
0.00130 to 0.00460 in.
Allowable limit
0.15 mm
0.0059 in.
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