Stihl 064 Service Manual page 80

STIHL 064, 066
Top:
1 = Washer
2 = Sleeve
Bottom:
Elbow connector in impulse hose
Installation is a reversal of the
removal sequence.
Note: Check that sleeve (in mani-
fold) and washer are in place be-
fore fitting the carburetor in posi-
tion.
After fitting the carburetor, check
that the elbow connector is proper-
ly seated in the impulse hose.
Tighten down mounting nuts to
3.5 Nm (2.6 Ibf.ft).
11.5 Servicing the
Carburetor
Top:
Fuel pump end cover fastening screws
Bottom:
1 = End cover
2 = Gasket
3 = Pump diaphragm
- Remove the carburetor
- see 11.4.
Note: It is advisable to check the
serviceability of the fuel pump
whenever the carburetor is
removed for repair.
- Unscrew the fuel pump end
cover and remove the gasket
and pump diaphragm.
Prying out fuel strainer
Note: The diaphragm and gasket often
stick to the cover or carburetor body. If this
is the case, take particular care when
separating them.
The diaphragms are the most delicate parts
of the carburetor. They are subjected to
continuous alternating stresses and the
material eventually shows signs of fatigue,
i.e. the diaphragms distort and swell.
Correct operation of the carburetor is no
longer possible. Check the gaskets and
replace them if they are damaged.
- If the fuel strainer is dirty, use a scriber
to pry it out of the carburetor body and
then clean it.
Important: If the fuel strainer is damaged,
fit a new one.
In such a case the fuel pickup body should
also be inspected and replaced if
necessary - see 11.9.
80