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Figure #11
Whenever the fuel system has been opened up for
service (lines disconnected or filters removed), it will
be necessary to bleed air from the system.
ZF6H Engine Series:
1) Loosen the air bleed valve (A) by hand on fuel
filter head.
Ref. Figure #12A.
2) Operate supply pump primer lever (B) until
fuel flow is free from air bubbles. Ref.
Figure
#13A.
3) Tighten bleeding valve securely; continue
operating hand primer until pump action is not
felt.
4) Start engine and check for leaks.
Figure #12A – ZF6H models
Figure #13A – ZE4H / ZF6H models
3.1.3
Changing the Fuel Filter Cartridges
Changing the cartridges and bleed any air from the
fuel system as per instructions given in section 3.1.1.
Fuel filter changes should take place as per
recommendations and only use approved filters. It
may also be necessary to change filters out with the
recommendations in the event of:
1)
The engine has had an overhaul.
2)
The quality of the fuel is questionable.
3)
The engine has been subjected to temporary
adverse conditions outwith it normal
operating parameters.
4)
The fuel tank condensation trap has not been
drained in line with manufacturer’s
recommendations.
3.1.3.1
Fuel Filters
Loosen the fuel filter by turning it
counterclockwise with the filter wrench.
Discard the used filter in a designated place.
Wipe the filter fitting face clean.
Apply a light coat of engine oil to the O-ring
and supply fuel to the new filters.
Turn the new filter until the filter O-ring is
fitted against the sealing face.
And the turn the filter cartridge about ¾ ~ 1
turn more with hands or filter wrench.
3.1.4
Fuel Tanks
Keep the fuel tank filled to reduce condensation to a
minimum. Open drain at the bottom of the fuel tank
once a week to drain off any possible water and/or
sediment. Fill tank after each test run.
B
D
C
B
A
