M40
6 / ENGLISH
SERVICE INSTRUCTIONS
B
A
The fuel contains aromatic substances that
form crust at the bottom of the burner. The
speed of encrustation depends on the quality
of the fuel and the output of the heater, and
consequently, the need for service may be va-
rying. During servicing, the crust will be remo-
ved from the burner and the fuel needle and
bottom carpet will be replaced by new ones, if
necessary.
Cleaning of the burner
Lift the protective grating of the heater. Open
the front wall of the heater by lifting the wall
upwards. After this, the front wall can be pulled
out. The front wall is fastened with tongues to
the screws on the sides, loose the screws, if
necessary. Arrows in fig. 7. Detach the protec-
tive plate of the plinth by undoing the screw in
the middle. See the circle in fig. 7. Pull the pro-
tective plate forwards and lift it up.
temperature sensor carefully. If the packing has
become brittle, it must be replaced with a new
one. If the glow plug is damaged, replace the
old plug with a new one. Fig. 9 shows an intact
glow plug and a typical glow plug in short cir-
cuit. A glow plug does not usually look different
if there is a cut-off.
Unscrew the fuel needle clamp and pull the fuel
needle carefully out by rotating it. See the ar-
row in fig. 8. The fuel needle is equipped with
a locking ring that defines the depth to which
the needle is installed. In model M40 the instal-
lation depth is 50 mm. If the fuel needle is
blocked, replace it with a new needle by pul-
ling the fuel hose out of the upper clamp of the
pump and install the hose for the new needle.
See the circle in fig. 8. Undo the 5 fixing sc-
rews and one distance screw on the combus-
tion chamber cover. Detach the combustion
chamber cover.
The packing inside the combustion chamber
cover must be intact as shown in fig. 10. De-
tach the burner assembly from the heater by
pulling out the spring that holds it in position.
See fig. 11.
Detach the screw and clamp of the tempera-
ture sensor and the corresponding glow plug
clamp from the combustion chamber cover.
See fig. 8. Pull the glow plug and temperature
sensor carefully out; do not pull from the wires
of the parts. Remove the white packing of the
Glow plug
Temperature sensor
Fig. 8: How to detach the temperature sensor, glow
plug and fuel needle.
Fig. 9: Intact glow plug (above) and damaged glow
plug in short circuit (below).
Fig. 7: M40 heater.
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