PIPER CHEROKEE SIX SERVICE MANUAL
e. If the above indicates
that the idle adjustment is too
rich or too lean, turn
the idle mixture
adjustment in the direction required
for correction, and check
this new position
by repeating the above procedure.
Make additional adjustments
as necessary until a check results in a momentary pick-up of approximately 50
RPM. Each time
the adjustment is changed, the engine
should be run up to 2000
RPM to clear
the engine before proceeding
with the RPM check. Make final
ad-
justment of the idle speed
adjustment to obtain the desired
idling RPM with closed
throttle.
The above method aims at a
setting that will obtain maximum
RPM with
minimum manifold pressure.
In case the setting does not remain
stable, check
the idle linkage;
any looseness in this linkage
would cause erratic idling. In
all
cases, allowance should be made for the effect of weather conditions and field
altitude upon idling adjustment.
7A-21.
FUEL AIR BLEED
NOZZLE.
7A-22. REMOVAL OF FUEL-AIR BLEED NOZZLE. Thenozzles must becare-
fully removed as they or the cylinders may be damaged.
a. Remove the lower engine cowl.
b. Disconnect the fuel line from the nozzle.
c. Carefully remove the nozzle, using the correct size deep socket.
d.
Clean and inspect the nozzle
as given in paragraph
7A-23.
7A-23. CLEANING AND INSPECTION OF FUEL-AIR BLEED NOZZLE.
a. Clean the nozzle
with acetone or equivalent and
blow out all foreign parti-
cles with compressed air in the direction opposite that of fuel flow. Do not use
wire or other
hard objects to
clean orifices.
b. Inspect the nozzle and cylinder threads for nicks, stripping or cross-
threading.
c. Inspect for battered or rounded hexagons.
POWER
PLANT
Revised:
7/28/75
2G21
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