STIHL 029, 039 8
2.2 Engine
Always check and, if necessary, repair the following parts before looking for faults on the engine:
- Air filter
- Fuel system
- Carburetor
- Ignition system
Condition Cause Remedy
Engine does not start easily, Oil seals between cylinder Replace oil seals
stalls at idle speed, but operates and engine pan damaged
normally at full throttle
Manifold leaking Seal or replace manifold
Engine pan leaking Seal engine pan
Engine pan damaged (cracks) Replace engine pan
Engine does not deliver full Secondary air seepage through Mount manifold correctly or
power or runs erratically poorly mounted or faulty replace
manifold
Piston rings leaking or Fit new piston rings
broken
Muffler carbonized Clean muffler (inlet
and exhaust), replace spark
arresting screen (if fitted)
Engine overheating Insufficient cylinder Thoroughly clean all cooling
cooling. Air inlets in fan air openings
housing blocked or cooling fins
on cylinder very dirty
Intake air preheating being Move shutter to
used at too high an outside summer position
temperature
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