Stihl 064 - Page 78

STIHL 064, 066 78
11.3 Leakage Testing the
Carburetor
Top:
Top: Top: Pressure testing carburetor
Fuel line fitted on elbow connector Tester's fuel line fitted on with carburetor crankcase tester
elbow connector 1106 850 2905
Bottom:
Fuel line 1110 141 8600 fitted Bottom: Bottom:
on ni
pp
le 0000 855 9200 Ni
pp
le connected to
p
ressure hose Dama
g
ed inlet needle
Troubleshooting chart - see 2.4. - Push fuel line with nipple onto If this pressure remains constant,
the elbow connector. Connect the carburetor is airtight. However,
The carburetor can be tested for nipple to tester's pressure hose. if it drops, there are two possible
leaks with the carburetor and causes:
crankcase tester. 1. The inlet needle is not sealing
- Close the vent screw on the (foreign matter in valve seat or
- Remove the air filter - see 11.1. rubber bulb and pump air into sealing cone of inlet needle is
the carburetor until the pres- damaged or inlet control lever
- Pull fuel hose off carburetor's sure gauge shows a reading of sticking).
elbow connector. approx. 0.4 bar (5.7 psi).
2. The metering diaphragm is
damaged.
In either of these cases the car-
buretor must be removed and
serviced - see 11.5.