ENGINE
6-34
3TNV88F Service Manual
Crankshaft and Camshaft Components
9. Remove the fuel injection pump from the gear
case/front plate only if it must be sent out for
repair, or will interfere with other procedures
such as “hot tank” cleaning. If the fuel injection
pump does not need to be repaired, leaving it
mounted to the timing gear case or plate will
eliminate the need to re-time it during
reassembly.
Disassembly of Camshaft and Timing
Components
Discard all gaskets, O-rings and seals. Use new
gaskets, O-rings and seals on reassembly of the
camshaft and timing components.
■
Removal of timing gear case cover
1. Remove the bolt and washer retaining the
crankshaft pulley.
NOTICE
Use care not to damage the threads in the end of
the crankshaft when removing the crankshaft
pulley.
2. Remove the crankshaft pulley using a gear
puller.
3. Remove the bolts that retain the gear case
cover to the cylinder block and oil pan.
4. Remove the gear case cover
(Figure 6-42, (1))
.
Figure 6-42
■
Checking timing gear backlash
Prior to removing the timing gears, measure the
gear backlash and determine the gear wear.
Check the backlash between each pair of mating
gears
. If not within specification,
replace both mating gears.
Backlash on page 6-6 for service limits.
Note: Do not allow the gear being checked to move
axially as excess end play could cause a
false reading.
1 – Fuel injection pump drive gear
2 – Camshaft drive gear
3 – Auxiliary drive gear (optional)
4 – Crankshaft drive gear
5 – Direction of rotation
6 – Oil pump drive gear
7 – Idler gear
Figure 6-43
■
Measuring idler gear-to-crankshaft gear
backlash
1. Install a dial indicator as shown in
.
Figure 6-44
2. Rotate the idler gear back and forth to check
the idler gear-to-crankshaft gear backlash. The
total indicator reading is the backlash. Record
the measurement.
K0001641A
1
K0001709A
B
B
A
A
C C
1
2
3
4
5
6
7
K0002086
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