Cub-cadet Yanmar 3TNV72 User Manual Page 138

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ENGINE
TNV IDI Service Manual
6-39
Cylinder Block
Measuring Idler Gear-to-Crankshaft Gear
Backlash
1. Install a dial indicator as shown in Figure 6-41.
Figure 6-41
2. Rotate the idler gear back and forth to check
idler gear-to-crankshaft gear backlash. Total
indicator reading is backlash. Record the
measurement.
Measuring Idler Gear-to-Camshaft Gear
Backlash
1. Drive a small wooden wedge between the
crankshaft gear and idler gear to prevent the
idler gear from rotating.
2. Install a dial indicator to read camshaft gear
backlash. Rotate camshaft drive gear against
idler gear to measure backlash. Record the
measurement.
3. Check the idler gear-to-fuel injection pump
drive gear backlash in the same manner as the
camshaft drive gear. Record the measurement.
Removal of Timing Gears
1. Remove the bolts from the idler gear shaft
(Figure 6-42, (1)). Remove the idler gear shaft,
idler gear (Figure 6-42, (3)) and bushing
(Figure 6-42, (2)).
Figure 6-42
2. Do not remove the crankshaft gear unless it is
damaged and requires replacement. If the gear
must be removed, remove it with a gear puller.
3. Removal of the camshaft gear requires the
camshaft be removed with a press. Do not
remove the camshaft gear unless it or the
camshaft is damaged and requires
replacement. See Removal of Camshaft on
page 6-41.
0002192
CAUTION
Do not loosen or remove the four bolts
retaining the fuel injection pump drive
gear to the fuel injection pump hub. Do
not disassemble the fuel injection pump
drive gear from the hub. Correct fuel
injection timing will be very difficult or
impossible to achieve.
0000031en
00021
(3)
(2)
(1)
TNV_IDI_ServiceManual_(3TNV72 for YN only).book 39 ページ 2007年11月29日 木曜日 午後2時58分
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