13-5
Chapter 13 ADJUSTMENT AND OPERATION
1.5.2 Fuel Injection Pump - Bleed Air
(1) Loosen the air vent plugs of fuel injection pump by
approx 1.5 turns.
(2) Feed fuel by moving the priming pump up and down.
(3) When fuel flowing from vent holes no longer contains
air bubbles, tighten a air vent plug leaving one plug un-
tightened. Lock the priming pump by turning the cap
clockwise while pushing it down. Then tighten the last
air vent plug.
Note:(a) To check the function of check valve, tighten the all
air vent plugs, then lock the priming pump cap. The
priming pump cap resists the push-in, but the check
valve opening pressure is stabilized and the valve
function is verified with this procedure.
(b) Thoroughly wipe off fuel spilled out of air vent
plug.
Fuel Injection Pump - Bleed Air
1.5.3 Priming Pump Cap - Lock
(1) Gently tighten the priming pump cap by hand until the
tightening force suddenly increases.
(2) Using a wrench, further tighten the priming pump cap
by 90 ± 10°from the mark position.
(3) Check the mounting condition of head packing. If any
defects such as deformation or dent are found, replace
the priming pump with a new one.
Priming Pump Cap - Lock
Priming Pump Cap Packing
Priming pump
cap
Air vent plug
Air vent cock
15 ± 2 N·m
{1.5 ± 0.2 kgf·m}
[11 ± 1.5 lbf·ft]
If the priming pump cap is not locked sufficiently, the
screw in cap wears due to engine vibration, which can
result in the priming pump cap to pop-off and fuel to
leak.
If it is over-tightened, the head of priming pump can be
damaged. Make sure to tighten the cap to the correct
angle.
Check the head packing of priming pump for deforma-
tion and damage. If any deformation or damage is
found, replace the priming pump with a new one.
Priming pump
90 ± 10°
Gently tighten
the priming cap
by hand until
the tightening
force suddenly
increases.
Head packing
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