Service and maintenance
Fuel system
46
© 2007
6
Clean/purge or change the fuel pre-filter
1
Fuel supply flow to the pump
2
Fuel return flow from the control block FCU (Fuel
Control Unit)
3
Fuel manual pump with bayonet lock for locking
and unlocking
4
Thermostat valve with stop lever (optional)
5
Filter insert
6
Connection option for electrical water level sen-
sor
7
Water drain tap
8
Water collecting vessel (bowl)
9
Fuel inlet from the fuel tank
10 Fuel return to fuel tank
11 Connection for electrical warning lamp/horn
Filter replacement
z
Close fuel shutoff tap (with high-level tank).
z
Place fuel collection vessel underneath the fuel
pre-filter.
z
Release the water drain tap (7), drain the water
and the fuel completely.
z
Unscrew the filter insert (5) with water collection
vessel (8) in anticlockwise direction and remove.
Close fuel shutoff tap (with high-level tank).
z
Loosen water collecting vessel (8) anticlockwise
from the old filer cartridge (5) and remove.
–
The special tool can be ordered under part
number
8192
(
74
).
z
Drain remaining fuel into the fuel collecting ves-
sel and clean water collecting vessel (8).
z
Screw water collecting vessel (8) clockwise onto
the new filter cartridge (5).
z
Clean any dirt from the sealing area of the new
filter cartridge (5) and opposite side of the filter
head.
z
Lightly moisten sealing areas of the filter car-
tridge (5) with fuel and screw onto the filter head
again clockwise (17-18 Nm).
z
Open the fuel shutoff tap and vent the system,
see venting the fuel system.
z
Properly dispose of the collected fuel and old fil-
ter cartridge (5).
Vent the fuel system
z
Unlock bayonet lock of the fuel manual pump (3)
by pressing and turning anticlockwise at the
same time. The pump piston is now pressed out
by the spring.
z
Keep pumping until a very strong resistance can
be felt and the pumping only progresses very
slowly.
z
Now continue pumping several times. (The re-
turn line must be filled).
z
Lock bayonet lock of the fuel manual pump (3) by
pressing and turning clockwise at the same time.
z
Start the engine and operate approx. 5 minutes
in idling mode or at low load. Check the pre-filter
for leaks while doing this.
OBJ_DOKU-12638-001.fm Seite 46 Mittwoch, 22. August 2007 9:25 09
