MAINTENANCE SCHEDULE & CHECKLISTS
4012/16 Diesel, February 1997 5
4
EVERY 250 HOURS OR EVERY 6 MONTHS
CHANGING THE CHANGE OVER FUEL
FILTER ELEMENTS WHEN THE ENGINE
IS STOPPED
All that is necessary is to unscrew the
canisters with a strap wrench as shown in
Fig. 48, leaving the change-over lever in the
vertical position as there is no pressure in the
fuel system with the engine stationary. The
replacement canisters are screwed on by
hand, after applying a smear of clean engine
oil to the rubber seals, and tightening by firm
hand pressure only. Bleed the air from the
new filters by slackening the vent screws
and operating the priming pump. Check for
leaks when the engine is restarted.
CHANGING THE CHANGE OVER FUEL
FILTER ELEMENTS WHEN THE ENGINE
IS RUNNING
The normal position of the change-over
valve lever is vertically upwards, when both
filters are in circuit. Turning the lever to the
left, puts the right hand filter out of service,
so that the right hand canister may be
exchanged for a new one, smearing the seal
with clean engine oil and tightening by firm
hand pressure only. Bleed the air from the
new filter by means of the vent screw as the
lever is returned to the vertical position.
Turning the lever so that it points the right,
puts the left hand filter out of service so that
it can then be exchanged for a new one, as
before. Again bleed the air from the new filter
as the lever is returned to its normal vertical
position, so that both elements are back in
circuit, and check for leaks before leaving
the engine.
NOTE: Prepare for some spillage of fuel by
placing a bowl of about 5 litres or 1 gallon
capacity under the filter when changing the
capacities.
CLEANING WATER TRAP/SEDIMENTER
(WHERE FITTED)
Open drain plug (1) to remove collected
water and sediment. The plug is self
retaining, leave open until clean fuel is seen
then screw back in see page 41. Remove
t
he bowl by unscrewing three screws (2).
Clean thoroughly all components and dry
with compressed air. Replace joint washer if
damaged.
FUEL SUPPLY AND PRIMING CIRCUITS
MAINTENANCE INSTRUCTIONS
FUEL LIFT PUMP
For information on the lift pump see Section
K
K1 of the Workshop Manual
.
HAND PRIMING PUMP (OPTIONAL)
The pump requires no maintenance but
should it fail to operate a replacement unit is
required.
WARNING
DISCONNECT
BATTERIES OR ANY
OTHER MEANS OF STARTING.
ALWAYS WEAR PROTECTIVE GLOVES.
Fig. 48
1
Fig. 48.1
2
1
