Yanmar 3TNV82A-B, Service Manual, Page: 267 / 394

FUEL SYSTEM
TNV DI Service Manual 7-27
Fuel Injection Pump
If installing a new fuel injection pump:
• Reinstall the timing grid sticker, provided with
the new fuel injection pump, onto the back of
the gear case / front plate (Figure 7-28). Align
the “standard mark” (Figure 7-28, (1)) with the
reference mark (Figure 7-28, (2)) made on the
gear case during disassembly.
Figure 7-28
• Calculate the difference between the timing
index numbers (Figure 7-29, (1)) of the fuel
injection pump that you removed and the
replacement fuel injection pump. See
Calculation Example below.
Figure 7-29
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 7-30, (2)) (rotated away from the
engine) as compared to the “standard mark”
(Figure 7-30, (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 7-30, (3)) (rotated toward the engine)
by the calculated negative amount.
• Each mark on the timing sticker represents
0.5° timing change.
(1)
(2)
0002139
Timing Index Number
Original injection pump= 6.8
Replacement injection pump= 7.3
Difference= +0.5
0002047
(1)
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