![background image](http://html1.mh-extra.com/html/stihl/029-039/029-039_service-manual_1378802008.webp)
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