Engine Maintenance
109
5. The engine should be close to the top dead
center position with the plunger port in the
pump closed. No fuel should flow from the
drip tube.
6. Turn the engine backwards past the injection
timing mark until fuel flows from the drip
tube.
7. Slowly rotate the engine in the direction of
rotation while watching the drip tube. When
the fuel flow slows to approximately one drip
every 10 to 15 seconds, check the timing
marks. They should be lined up.
8. If the timing marks did not line up, a shim or
shims will have to be added or subtracted
from the injection pump. Adding shims will
retard the injection timing, subtracting shims
will advance the timing. Increasing or
decreasing shim thickness by 0.004 in.
(0.1 mm) will change the timing by 1 degree.
9. After shims have been added or subtracted,
recheck the timing.
10. When the injection pump has been correctly
timed to the engine, remove the pump and put
a light coat of silicone gasket sealer on the
shim pack and the pump, or dip the new shims
in lacquer thinner to activate the sealer.
11. Reinstall the pump, and torque the nuts to
18 to 20 ft-lb (24 to 27 N•m).
12. Reinstall the delivery valve and spring.
Torque the delivery valve holder to 30 ft-lb
(41 N•m).
13. Reinstall the injector lines, bleed the air from
the nozzles, and test run the engine.
Timing Individual Cylinder Injection
TK 3.95 Engine
This procedure should be used when a poor
running engine has had all possible problems
checked but continues to run badly. If the
injection pump has been repaired or replaced, the
chance of individual cylinder timing problems has
a greater possibility of occurring.
To check individual cylinder timing, follow the
pump timing procedure but instead of changing
shims to adjust pump timing, check the timing of
number 2 and number 3 injector to the engine
after checking number 1. The cylinders should
time on their respective flywheel timing marks.
If the injection pump plungers are not correctly
timed to each other, the pump must be removed
and sent to a diesel injection equipment repair
shop for calibration.
NOTE: The order of the flywheel timing marks
is 1, 2, 3, but the firing order is 1, 3, 2. This is
because the engine fires every 240 degrees of
crankshaft rotation. Therefore, when checking
individual cylinder timing check number 1 first
then rotate the engine past number 2 to number
3 and check number 3. Then rotate the engine
past number 1 to number 2 and check number 2.
Figure 135: Individual Cylinder Timing
and Firing Order
CAUTION: The 8S wire on the starter
motor should be disconnected.
CAUTION: Loosen the injection lines on
the injection nozzles of the number 2 and
3 cylinders to prevent any possibility of the
engine firing.
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