Yanmar 4LHA-HTP Operation Manual page 360

Chapter 3 Fuel Injection Equipment
2. Bleeding and Checking Injection Timing
2. Check the fuel injection timing as follows:
(1) R e m o v e the high pressure pipe from the fuel injection
pump.
(2) Pull the engine warm up knob out and place the control
lever in the "half speed" position.
(3) Insert a turning bar into the hole on the crank
pulley on the front side. Crank the engine lightly
to check the fuel injection timing.
(4) Timing marks on the flywheel can be seen through the
hole on the flywheel housing
NOTE
E M
VE pump
I
Make sure that the match marks are aligned.
(With alignment of these marks, injection timing
is automatically adjusted)
Fuel injection pump stand
- Gear case
3-i-3
3. Removal and installation of injection pump
(1) Remove the fuel injection pump gear cover from the tim-
ing gear housing cover.
(2) Make mating marks on the idle gear and the injection
pump gear using white paint for reinstallation.
(3) Remove the pump drive shaft end nut, the washer,
the pump gear from the shaft, three pump retaining
bolts, and two pump support bolts.
Remove the injection pump.
NOTE: When removing the pump;
1) Do not drop keys from the drive shaft into the gear
housing.
2) Avoid damage to O-rings on the pump.
3) Do not hit the shaft end with a hammer.
(4) When installing the pump, match the mating marks on the
bracket and the pump flange.
(5) While aligning the mating marks on the idle gear and
the pump gear, install the pump to the pump gear.
(6) Tighten the drive shaft end nut to 69N-m(7kgf-m).
4LHA Serie