Yanmar 3TNV Series Service Manual page 62

1) Before removing a fuel pump drive gear, make ID
marks on the gearing part of the pump drive gear
and the idle gear with paint and so on.
2) Make the mark-off line to the gear case precisely
in accordance with the position of mark-off line of
the fuel pump.
3) Before removing a fuel pump, put the standard
mark of a sticker for fuel injection angle
adjustment in accordance with the mark-off line
of the fuel pump and paste it on the gear case.
4) Remove a fuel pump, and read the fuel injection
angle recorded in that fuel pump.
5) Read the injection angle recorded on a reassembled fuel pump and calculate the difference from
the injection angle of the disassembled fuel pump. (When re-installation does the same fuel
pump, the angular difference is zero.)
Fuel injection angle difference (cam angle) = (the fuel injection angle of a reassembled fuel pump)
[NOTICE]
Tell the fuel pump number to Yanmar, and inquire the injection angle of the pump when it is hard to
find out.
6) Put the fuel pump on the gear case temporarily and install the drive gear on the cam shaft with
checking the ID marks, which were put on the fuel pump drive gear and the idle gear at the time of
the disassembling.
Tighten the installation nut of a pump drive gear.
Model
3TNV82A TNV88
4TNV94L/98/106(T)
- (the fuel injection angle of a disassembled previous fuel pump)
Tightening torque
Nm(kgf･m)
78 88 (8 9)
113 123 (11.5 12.5)
Lubricating oil application
(thread portion, and seat surface)
Not applied
47
2. Inspection and Adjustment