8-4
Chapter 8 PERIODIC INSPECTION AND MAINTENANCE PROCEDURES
Fuel system (in-line type fuel injection pump) - Bleed air
Bleed air at fuel filters and then at the fuel injection
pump. Bleeding from upstream to downstream is
effective for this job.
Fig. 8-5 Priming pump - Handle
Fuel filter - Bleed air
1. Loosen the air vent plug on the fuel filter about 1.5
turns.
2. Turn the priming pump counterclockwise to unlock,
and prime the fuel filter.
3. When the fuel from the air vent plug becomes free
from air bubbles, stop priming and tighten the air
vent plug to the specified torque.
Fig. 8-6 Fuel filter - Bleed air
Fuel injection pump - Bleed air
1. Loosen the air vent plug on the fuel injection pump
by rotating about 1.5 turns.
2. Move the priming pump up and down. When the
fuel flow from the air vent plug becomes free of
bubbles, push and turn the priming pump clockwise
to lock.
3. Tighten the air vent plug on the fuel injection pump.
Fig. 8-7 Fuel injection pump - Bleed air
When fuel overflow from the air vent plug, wipe thor-
oughly with a cloth. Spilled fuel causes fire hazard
After bleeding, lock the priming pump securely.If the
cap is not locked tightly, the priming pump can be
damaged, causing a fuel leakage that could lead to a
fire.
Tighten the priming pump before closing the air vent
plug.
Do not close all air vent plugs and cocks before lock-
ing the priming pump, as the priming pump will not
return to the original position due to internal pres-
sure.
[Lock release] [Priming] [Lock]
Turn counter-
clockwise
Move cap up
and down
While depressing,
turn coockwise
If air vent plugs, the thread portion of the bracket, or
sealing washers are damaged, replace them with
new ones.
Air vent
plug
Priming pump
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