FUEL SYSTEM
7-18
3TNV88F Service Manual
Fuel Injection Pump
• Calculate the difference between the timing
index numbers
(Figure 7-24, (1))
of the fuel
injection pump that you removed and the
replacement fuel injection pump.
See
Calculation example below
.
Figure 7-24
Adjusting the fuel injection timing to
compensate for the difference in pump timing
index numbers:
Calculation example
• If the difference between the timing index
numbers is a positive number, the fuel injection
pump mounting position must be advanced
(Figure 7-25, (2))
(rotated away from the
engine) as compared to the “standard mark”
(Figure 7-25, (1))
by the calculated positive
amount, adjust the fuel injection pump to the
calculated value.
• If the difference between the timing index
numbers is a negative number, the
replacement injection pump must be retarded
(Figure 7-25, (3))
(rotated toward the engine)
by the calculated negative amount.
• Each mark on the timing sticker represents
0.5° timing change.
The above calculated difference indicates that
the replacement fuel injection pump is to be
installed at +0.5° (advanced) from the “Standard
Mark”
(Figure 7-25, (1))
on the timing sticker.
Figure 7-25
In this case, rotate the top of the fuel injection
pump away from the cylinder block until the mark
on the outside upper mounting boss
(Figure 7-26, (1))
of the fuel injection pump
aligns with the +0.5° mark on the timing sticker.
Figure 7-26
Timing index number
Original injection pump = 6.8
Replacement injection pump = 7.3
Difference = +0.5
K0002047
1
K0002124A
1
2
3
+0.5°
+1.0°
1
K0002125A
3TNV88F_SVM_A4.book 18 ページ 2012年7月26日 木曜日 午後6時4分