Yanmar 3YM30, Service Manual

Page: 117 / 231

4. Disassembly and reassembly
97
(22) Mounting the fuel injection pump
1) Lightly fit the fuel injection pump on the gear case.
(After adjusting injection timing, tighten the fuel
injection pump. Before mounting the heat
exchanger to the cylinder head, adjust the injection
timing.).
NOTE:
Be careful not to scratch the O-ring between the
fuel injection pump and gear case.
2) Fit the fuel injection pump drive gear to the fuel
pump camshaft.
3) Align the "C" match marks on the fuel injection
pump drive gear and idle gear.
4) Tighten the pump drive gear nut to the specified
torque. (Do not apply lube oil to the nut.)
5) Measure the backlash of the fuel injection pump drive gear.
(23) Mounting the fuel injection nozzle
1) Replace the used fuel nozzle protector and fuel
nozzle seat with new ones. Put the seat in the
cylinder head and the protector to the nozzle tip.
Mount the fuel injection nozzle to the cylinder
head.
2) Tighten the fuel nozzle retainer bolt to the specified
torque. (Do not apply lube oil to the bolt.)
Tightening torque N•m (kgf•m
)
Pump drive gear nut 58.9-68.7 (6.0-7.0)
Backlash mm
Fuel injection pump drive gear 0.06-0.12
Tightening torque N•m (kgf•m)
Fuel nozzle retainer bolt 49.0-53.0 (5.0-5.4)
(Gear train)
C
C
A
B
B
Idle gear
Crankshaft gear
Direction of rotation
Fuel injection pump
drive gear
Camshaft gear
A
Fuel injection nozzle
Nozzle protector
Nozzle seat
Nozzle seat
Cylinder head