STIHL 020 T
20
4.4
Cylinder and Piston
4.4.1
Removal
Always check and, if necessary, repair
the fuel system, carburetor, air filter
and ignition system before looking for
faults on the engine.
• Remove the tank housing -
see 10.6.
• Remove the spark plug.
• Now use the assembly drift (2) to
push the piston pin (1) out of the
piston.
Note:
If the piston pin is stuck, tap the
end of the drift
lightly
with a hammer
if necessary.
Important:
Hold the piston steady
during this process to ensure that no
jolts are transmitted to the connecting
rod.
• Remove piston and take the
needle cage out of the connecting
rod.
• Release and unscrew the four
cylinder base screws through the
holes in the cylinder fins.
• Pull the cylinder off the piston.
• Remove the cylinder gasket.
• Use a scriber or similar tool to
ease the hookless snap rings out
of the grooves in the piston
bosses.
• Inspect piston rings and replace if
necessary - see 4.5.
• Pull the manifold (1) off the
intake port.
• Inspect the cylinder and replace
it if necessary.
Note:
If a new cylinder has to be
installed, always fit the matching
piston. Replacement cylinders are
only supplied complete with piston
for this reason.
Important:
Before removing the
piston, decide whether or not the
crankshaft has to be removed as well.
To remove the flywheel, block the
crankshaft by sliding the wooden
assembly block between the piston
and crankcase.
