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Adjustments and Benchtesting
Bleeding the fuel injection pump
1. Loosen the air vent cock on the fuel injection
pump about 1.5 turns.
2. Pump the priming pump to start the flow of fuel
through the system.
3. When fuel without visible bubbles comes out of
the air vent cock, lock the priming pump cap
while holding it down. Tighten the air vent cock.
NOTE! Be sure to lock the priming pump cap before
tightening the air vent plugs and cock. If not, the cap
will not return to the original position due to pressure
in the priming pump.
4. Tighten the priming pump cap by hand until the
tightening force increases, normally this occurs
after approximately 70 to 90 degrees. Mark this
position on the priming pum.
5. Tighten the priming pump cap an additional 120
to150 degrees using a wrench.
IMPORTANT! If the priming pump cap is tight-
ened too much (more than 240 degrees in to-
tal), the top of the pump might be damaged.
IMPORTANT! If the pump cap is not tightened
properly, engine vibration may cause excessive
wear to the internal threads of the pump. This
may cause the priming pump cap to eject and
oil to flow out leading to engine failure and dam-
age to the installation.
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