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OM-4434 Page 25
6-2. Cold Weather Engine Operation
Ref. 216 170
1
Engine Control Switch
Carburetor Icing
Carburetor icing causes the unit to drop below the normal idle speed and then
stall. This condition occurs when the temperature is near freezing and the rela-
tive humidity is high. Ice forms on the throttle plate and inner bore of the carbu-
retor. The engine typically restarts without problems but soon stalls again.
Treat gasoline with a fuel de
−
icer product (isopropyl alcohol).
Place the Engine Control switch in the Run position.
Run engine only when expecting to frequently load it.
Breather Icing
Oil breather/pulse line icing occurs in severe cold (continuously below 0
F).
Moisture accumulates in the oil from piston ring blow
−
by if the engine is exten-
sively idled. This may cause vacuum line freezing, oil breather tube freezing
or ice in the carburetor. All of these cause operating problems. Due to ice in
the lines, the engine may not restart until it is warmed to above freezing.
Load engine and reduce idle times to prevent engine shutdowns.
Use an electric fuel pump to avoid pulse line freezing.
Install engine cold
−
weather kit.
Both Kohler (1-800-544-2444) and Subaru/Robin (1-800-277-6246) offer kits
for cold weather operation. The user can install these kits. Both kits pull heated
air from the muffler surface into the carburetor and shut the cold air off. This
increases engine temperature during operation in both idle and high speed.
When the ambient temperatures become warmer (above 45
_
F) the air
flow will have to be returned to normal.
1
Frequently
Loaded
Infrequently
Loaded
Notes
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