STIHL TS 400
20
• Lever the hookless snap rings out of
the annular grooves with a drawing
pin or similar implement.
• Check and replace piston rings,
• Insert the assembly pin through
the piston bore and conrod eye
(needle cage) with the stub first
and align the piston.
• Heat piston to approx. 60 °C on a
hotplate and slide onto conrod. The
mark (1) on the piston base must
point away from the manifold (2).
• Remove cylinder gasket.
• Press piston pin (1) out of the
piston with assembly pin (2).
Note:
If the piston pin is stuck, it can
be released by
lightly
knocking
against the assembly pin with a
hammer. The pin
must be steadied
in order not to transmit the knocks to
the conrod.
- Remove piston from conrod and
draw needle cage out of the
conrod eye.
• Thoroughly clean sealing face
(1).
• Coat needle cage (2) with oil and
insert in conrod eye.
- Remove decompression valve
as described in chapter 5.8.
- Check cylinder and replace if
necessary.
Note:
The corresponding piston must
also be fitted when installing a new
cylinder. New cylinders are therefore
only available with piston.
5.6.2
Installation
