STIHL 020 T
22
• Apply the installing tool to the
piston boss, hold the piston steady,
center the tool shank exactly and
press home until the snap ring slips
into the groove.
• Position the piston rings so that
the radii at the ring gap meet at the
fixing pin in the piston groove when
the rings are compressed.
Note:
Fit the snap ring so that its
gap is on the piston's vertical axis (it
must point either up or down).
• Push the manifold onto the
intake port. Make sure that the
straight faces (see arrows) on
the manifold and port line up.
• Lubricate the inside of the
cylinder with oil and line it up
so that it is positioned as it will
be in the installed condition. It is
essential to observe this point as
the piston rings might otherwise
break.
• Slide the cylinder over the piston
- the clamping strap is pushed
downward as the piston rings slip
into the cylinder.
• Remove clamping strap and
wooden assembly block.
• Carefully line up the cylinder
gasket.
• Fit cylinder base screws and
tighten them alternately to
11.5 Nm (8.5 Ibf.ft) in a diagonal
pattern.
• Fit the fuel tank - see 10.6.
• Use the clamping strap (1) to
compress the piston rings
around the piston.
• Check that piston rings are
correctly positioned.
• Fit new cylinder gasket.
• Lubricate piston and piston rings
with oil. Rest the piston (1) on the
wooden assembly block (2).
