Leakage Test - Stihl 088 Owner's Manual

10.2.2

Leakage Test

The carburetor can be tested for
leaks with the carburetor and
crankcase tester 1106 850 2905.
- Remove filter base - see 10.1.
• Push the fuel line (1)
1110 141 8600 onto the nipple
(2) 0000 855 9200.
• Pull off the fuel hose.
STIHL 088
• Push the fuel line with nipple
onto the carburetor's elbow
connector.
• Push the nipple into the tester's
pressure hose.
• Close the vent screw (1) on the
rubber bulb (2) and pump air into
the carburetor until the pressure
gauge (3) shows a reading of
approx. 0.4 bar (5.8 psi).
If this pressure remains constant, the
carburetor is airtight. However, if it
drops, there are two possible causes:
1. The inlet needle is not sealing
(foreign matter in valve seat or
sealing cone of inlet needle is
damaged or inlet control lever
sticking).
2. The metering diaphragm is
damaged.
In either of these cases the carburetor
must be removed and serviced.
• After completing the test, open the
vent screw and pull the fuel line off
the elbow connector.
• Install the filter base - see 10.1.
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