Stihl TS 420 Manual page 41

– Examine and clean the mating
surface (arrow).
The mating surface must be in
perfect condition and without any
damage whatsoever. Parts with
damaged mating surfaces must be
replaced, b 4.6.
Always use a new cylinder gasket
after removing the cylinder.
1
– Position the cylinder gasket (1)
so that the forked tab engages
the peg (arrow).
: Fit the cylinder gasket (1).
40
1
– Examine the intake elbow (1),
replace if necessary. Engine
operation may be impaired by the
slightest damage, b 4.6.
– Remove the intake elbow (1),
b 12.6.
: Examine and clean the mating
surface (arrow), remove any
remaining gasket scraps.
– Check the mating surface on the
cylinder exhaust port and intake
fitting.
The mating surfaces must be in
perfect condition and without any
damage whatsoever. A new cylinder
must be used if the mating surfaces
are damaged.
Screws and cover on the cylinder
are due to production and must not
be removed; simply loosening the
screws can cause problems in the
form of leaks.
1
: Place wooden assembly
block (1) 1108 893 4800
between piston and crankcase.
– Coat the piston, piston rings and
inside of cylinder with oil, b 14.
– Ensure that the piston rings are
correctly positioned, b 7.8.
– Align the tightening ring – the
pegs (arrows) must point in the
opposite direction to the arrow on
the piston head.
: Slide the tightening ring (1)
4238 893 7000 over the piston
until it encloses the piston rings
completely.
The tightening ring (1) must be fitted
so that the piston rings do not
protrude beyond the piston wall.
TS 410, TS 420
1