Yanmar 4TNV98, Service Manual

Page: 156 / 246

4TNV98 & 4TNE98 Diesel Engine Section 4. Fuel System 154
4. Align the key on the fuel injection pump shaft with
the keyway in the fuel injection pump drive gear
hub. Reinstall the fuel injection pump into the fuel
injection pump drive gear and gear housing.
Reinstall the pump retaining nuts finger tight.
5. Reinstall the fuel injection pump drive gear lock
washer (Figure 7-23, (2)) and nut (Figure 7-23,
(1)) . Do not lubricate the threads of the nut or
shaft. Hold the crankshaft pulley bolt with a
socket wrench and tighten the drive gear nut to
the specified torque. See Special Torque Chart
on page 143.
Figure 7-23
If reinstalling the original fuel injection pump:
• Align the reference marks
(Figure 7-24, (1))
previously made on both the fuel injection pump
mounting flange and gear case or front plate.
Figure 7-24
• Tighten the fuel injection pump retaining nuts to
specification. See Special Torque Chart on page
143.
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 7-25) . Align the
“standard mark” (Figure 7-25, (1)) with the
reference mark (Figure 7-25, (2)) made on the
gear case during disassembly.
Figure 7-25