Operation Manual

152 MS 241 C
14. Heating
14.1 Carburetor heating
The heating element is installed
between the switchgear halter and
the carburetor. Power is provided to
the heating element via leads.
The heating element is regulated by
the thermostatic switch on the
underside of the carburetor.
The heating element and the
thermostatic switch must also be
checked if running problems occur
when the cold engine is idling or
running at part load, particularly at
sub-zero temperatures.
Idling problems with a hot engine
may also indicate a fault in the
heating element of the thermostatic
switch.
14.1.1 Check overall system
In the function check of the overall
system, the generator and heating
elements are checked. Precondition
is an ambient temperature of at
least +20°C (68°F).
If the temperature is below + 13 °C
(55 °F), the thermostatic switch may
be closed and produce false
readings.
– Check the carburetor heating in
accordance with the
troubleshooting chart carburetor
heating, b 14.2
– Remove the air filter, b 13.1
– Set ohmmeter to measuring
range "Ω"
: Clip one of the two test leads onto
a nut of the baffle and the other
onto a cylinder fin
If the system is OK, the ohmmeter
will show a reading of approx. 10 Ω
in the measuring range "Ω".
If the reading obtained is outside
this tolerance, each component
must be tested separately.
14.1.2 Check heating element
– Remove filter base, b 13.1
– Pull of switchgear and set it
aside, pull out the carburetor
somewhat in the direction of the
handle, b 13.5
: Remove blade receptacle (1)
: Remove heating element (2)
from the studs
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: Clip one test lead to the heating
element, the second test lead to
the blade receptacle
If the heating element is OK, the
ohmmeter will show a reading
of approx. 12 Ω in the measuring
range "Ω".
Installation
: Slide the heating element (1)
over the studs so that the hole
engages the pin (2)
: Orient the crimped side of the
blade receptacle (3) so that it
faces the carburetor
: Push the blade receptacle (3)
completely onto the connector
tab (arrow)
– Reassemble remaining parts in
reverse order
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