Carburetor Heating System Troubleshooting Chart - Stihl MS 240 Instruction Manual

15.2

Carburetor Heating System Troubleshooting Chart

– Measure resistance of
temperature = +20°C (68°F)
– Check thermostatic switch on basis of
tolerance range of + 13°C (55 °F) to + 6°C
thermostatic switch close
between + 13°C (55 °F) and + 6 °C
(43 °F), but no later than
thermostatic switch open
between + 6°C (55 °F) and + 13 °C
(43 °F), but no later than
Carburetor heating system
Circuit diagram
G
MS 240, MS 260, MS 260 C
heating element at
Resistance
approx. 8 Ω?
yes
(43 °F)
Does
+ 6 °C (43 °F)?
yes
Does
+ 13 °C (55 °F)?
yes
in order
1 4
2
5
3
– Replace heating
no
element, b 15.1
– Replace thermostatic
no
switch, b 15.1.3
no – Replace thermostatic
switch, b 15.1.3
G Generator
1 Handlebar
2 Rear handle
3 Heater switch
4 Heating element (carburetor)
5 Thermostatic switch
103