42
TK 56433-5-MM-EN
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.
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
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.
Figure 32.
Examples of Injection Pump Index Mark
Alignment with Injection Angle Sticker
1.
Injection Pump Index Mark at –0.6 Degrees
2.
Injection Pump Index Mark at +1.8 Degrees
8. Install the injection pump gear, lock washer, and
nut. Torque the nut to 58 to 65 ft-lb (78 to 88 N•m).
N
No
otte
e:: 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.
Figure 33.
Timing Mark Alignment
1.
Fuel Injection Pump Gear
2.
Idler Gear
3.
Camshaft Gear
4.
Crankshaft Gear
N
No
otte
e:: The oil pump is located in the timing gear cover
on TK486V25/TK486V25L/TK486VHA 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.
Figure 34.
Align Flat Sides of Crankshaft Gear with
Flat Sides of Inner Rotor in Timing Gear Cover
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
