Stihl 064 - Page 80

STIHL 064, 066 80
11.5 Servicing the
Carburetor
Top:
Top: Fuel pump end cover fastening screws
1 = Washer
2 = Sleeve Bottom:
1 = End cover
Bottom: 2 = Gasket
Elbow connector in im
p
ulse hose 3 = Pum
p
dia
p
hra
g
m Pr
y
in
g
out fuel straine
r
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.
Installation is a reversal of the - Remove the carburetor
removal sequence. - see 11.4.
Note: Check that sleeve (in mani- Note: It is advisable to check the
fold) and washer are in place be- serviceability of the fuel pump
fore fitting the carburetor in posi- whenever the carburetor is
tion. removed for repair.
After fitting the carburetor, check - Unscrew the fuel pump end
that the elbow connector is proper- cover and remove the gasket
ly seated in the impulse hose. and pump diaphragm.
Tighten down mounting nuts to
3.5 Nm (2.6 Ibf.ft).