TARAL 850, Instruction Manual

Page: 74 / 102

SETTING INJECTION PUMP TIMING
Adjustment of injection pump requires expertise
and special equipment; the inspection must be
performed only at authorized service centers.
Operator instructions provided in this section are
only for information purpose.
A certain amount of variation can apply to the
injection pump timing due to mechanical wear.
This problem is indicated by the loss of engine
power, the exhaust gas becoming extremely black
and the engine making greater noise.
In some cases white exhaust gas can be observed
in high altitude geographical regions; ignition
advance may need to be adjusted for proper
engine performance.
Factory setting for engine ignition advance is 12°.
For adjustment, perform the following in the same
order:
1. Remove the engine shut-off solenoid or place
the key to ignition-1.
2. Remove the safety frame and check the lines
on the flywheel looking through the peep hole
on the right side of the flywheel housing or
track top dead centers or ignition timings by
checking the lines on the crank pulley.
3. To find the "1,4 AZ' sign on the flywheel, twist
the flywheel (see “Figure 67”). You can twist
the flywheel by placing a ring spanner to the
hub (see “Figure 66”)
Definitions for the abbreviations on the flywheel
are as follows:
“1,4 AZ”: Injection timing for 1
st
or 4
th
cylinder.
“1,4 UN”: Top dead center timing for 1
st
or 4
th
cylinder.
“2,3 AZ”: Injection timing for 2
nd
or 3
rd
cylinder.
“2,3 UN”: Top dead center timing for 2
nd
or 3
rd
cylinder.
There is a 360° (one crankshaft cycle) phase
difference between the first cylinder and fourth
cylinder.
There is a 360° (one crankshaft cycle) phase
difference between the second cylinder and third
cylinder.
4. When the sign is found, turn the crankshaft
about 30° counterclockwise (when viewed
from the front of the engine).
5. "1,4 AZ', means injection timing for cylinders 1
or 4.
6. To turn the crankshaft by holding with a ring
spanner, use a special service tool (ring
spanner). Remove the high pressure pipe.
7. Slightly loosen the nozzle holder, the part (1)
shown in “Figure 68” and tighten after filled
with fuel as seen in “Figure 68”.
8. Wipe the fuel on the nozzle holder with a clean
cloth and leave only a small amount of fuel.
9. Observe the fuel on the nozzle holder by slowly
turning the crankshaft clockwise (when viewed
from the front side of the engine).
10. The moment when the fuel on the nozzle
holder increases abruptly is injection timing.
11. If the fuel increases too much, it means the
injection time have passed. To identify the
time when the fuel amount increases, repeat
the procedure above.
62
Figure 67
CAUTION
Figure 66