Service Manual

Table Of Contents
6
6.2 Fuel system
Care and maintenance work
33
Cleaning / purging and possibly
changing the fuel prefilter
Cleaning (purging) – draining water:
z
Shut off the engine or switch over to the
other filter if a lubricating oil filter is fitted.
z
Close the fuel stopcock or supply (if availab-
le).
z
Open the vent screw 1 on the cover 2.
Connection of a warning system (lamp/
siren) to contacts 7 is prescribed. Im-
mediate maintenance is necessary if
the warning system is triggered.
No naked lights when working on the
fuel system!
Do not smoke!
Dispose of used fuel in an environmen-
tally friendly way!
z
Position fuel collecting receptacle beneath
fuel prefilter.
z
Empty water and dirt from the bowl 6 by ope-
ning the drain cock (press in lightly without
using force and turn) and close the drain
cock again afterwards.
z
Close the vent screw 1 on the cover 2.
z
Vent the fuel system see
(
32
)
.
Changing the filter element 5:
Change at least once a year or when necessa-
ry (drop in performance even after purging).
z
Shut off the engine or switch over to the
other filter if a lubricating oil filter is fitted.
z
Close the fuel stopcock or supply (if availab-
le).
z
Loosen the cover screws 3 diagonally.
z
Remove cover 2.
z
Remove spring cassette 4.
z
Remove filter insert 5 on the clip.
z
Insert new filter insert 5.
z
Place the spring cassette 4 on the element.
z
Check the cover gasket for correct fit in the
cover 2 and for damage (change if necessa-
ry).
z
Tighten the cover 2 with the screws 3 diago-
nally (tightening torque 6 Nm).
z
Check the cover 2 for correct fit and tight-
ness.
z
Vent the fuel system see
(
32
)
.