Engine Maintenance
110
5. Record the injection angle marked on the side
of the new injection pump.
6. Calculate the injection angle difference by
subtracting the injection angle of the old
injection pump from the injection angle of the
new injection pump.
7. Install the new injection pump on the gear
case and position it so the index mark on the
injection pump is aligned with the mark equal
to the injection angle difference on the
injection angle sticker (see the following
examples). Tighten the injection pump
mounting nuts when the index mark is aligned
as necessary with the injection angle sticker.
8. Install the injection pump gear, lock washer,
and nut. Torque the nut to 58 to 65 ft-lb (78 to
88 N•m).
NOTE: If the timing gear cover was removed to
remove the injection pump gear, make sure the
timing marks on the timing gears are aligned as
shown below. It helps to install the idler gear last
when aligning the timing marks.
NOTE: The oil pump is located in the timing
gear cover on TK486V25 engines. The inner
rotor of the oil pump fits around the crankshaft
gear. Make sure that the flat sides of the inner
rotor are aligned with the flat sides on the
crankshaft gear when installing the timing gear
cover.
Examples
Injection Angle of New
Injection Pump (Degrees)
8.5
6.1
– Injection Angle of Old
Injection Pump (Degrees)
– 6.7
– 6.7
= Injection Angle Difference
(Degrees)
= +1.8
= –0.6
1.
Injection Pump Index Mark at –0.6 Degrees
2.
Injection Pump Index Mark at +1.8 Degrees
Figure 180: Examples of Injection Pump Index
Mark Alignment with Injection Angle Sticker
1
2
1.
Fuel Injection Pump Gear
2.
Idler Gear
3.
Camshaft Gear
4.
Crankshaft Gear
Figure 181: Timing Mark Alignment
1.
Crankshaft Gear
2.
Oil Pump Cover
3.
Outer Rotor
4.
Inner Rotor
5.
Timing Gear Cover
6.
Flat Sides on Inner Rotor
7.
Flat Side on Crankshaft Gear
Figure 182: Align Flat Sides of Crankshaft Gear
with Flat Sides of Inner Rotor in Timing Gear Cover
1
3
2
4
1
5
2
7
3
4
6
