Stihl 064

STIHL 064, 066 31
4.4 Piston Rings
Top:
Pressing the manifold downward Top:
Piston ring grooves
Bottom:
Pulling manifold through intake opening Tightening the cylinder base screws Bottom:
in tank housing with torque wrench 5910 890 0310 Fitting piston ring
- Carefully line up the cylinder and gasket.
- Fit new cylinder base screws of property
class 12.9 and tighten them down
alternately in a diagonal pattern.
Note: Tighten M5 x 20 screws to 12 Nm
(8.8 Ibf.ft) and M6 x 20 screws to 15 Nm
(11.0 Ibf.ft)
Important: It is essential to observe the
above tightening torques as the screws
might otherwise work loose.
- Fit the manifold in the tank hous- Assembly is now a reversal of the - Remove the piston - see 4.3.1.
ing intake opening as follows: disassembly sequence. Always fit
Wind a piece of string (about new gaskets as a matter of routine. - Remove rings from piston.
15 cm / 6" long) around the back
of the manifold flange, then press - Use a piece of an old piston ring
the manifold downward and pass to scrape the grooves clean.
the ends of the string through the
intake opening. - Install the new piston rings in the
grooves so that the radii face up-
- Pull the ends of the string out- ward.
ward. The manifold flange is thus
pulled through the tank housing - Install the piston - see 4.3.2.
intake opening without damaging
the manifold.