STIHL 009, 010, 011
11
3. ENGINE
3.1 Construction
Series 010 chain saws are powered The crankcase is a two-part pressure The connecting rod is supported by
by an air-cooled, single cylinder two- die casting made of a magnesium cylindrical rollers, i. e. without a
stroke engine. alloy. The drop-forged crankshaft is bearing cage, on the crankpin and
supported in two needle sleeves. Two a needle sleeve on the piston pin.
oil seals, one for each half of the
crankcase, hermetically seal the The cylinder and piston are made of
crank chamber. an aluminium alloy. The cylinder bore
is coated in a special process.
3.2 Troubleshooting Chart
Check fuel system, carburetor, air filter and ignition system before looking for faults in the engine.
Condition Cause Remedy
Engine does not start easily, Oil seals in crankcase leaking Replace oil seals
stalls at idle speed, but runs
normally at full throttle
Carburetor flange leaking, Fit new carburetor flange
cracked
Crankcase damaged (cracks) Replace crankcase
Engine does not deliver full Secondary air seepage into Fit new carburetor flange
power or runs erratically engine because of faulty
carburetor flange
Piston ring leaking or broken Replace piston ring
Engine overheats Insufficient cylinder cooling. Thoroughly clean all cooling
Air inlets in fan housing blocked air openings
or cylinder cooling fins clogged with dirt
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