Fuel Air Bleed Nozzles Removal - Piper PA-24 Comanche Service Manual

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PIPER COMA~CHE SERVICE MA~l'AL
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ricrat 7A-I3. FrEL AIR BLEED NOZZLE
d. When the idling speed has been stabilized. move the cockpit mixture control with a smooth. steady
pull toward the "Idle Cut-Off" position and observe the tachometer for any change during the "leaning'
process. Caution must be exercised to return the mixture control to the "Full Rich" position bel ore the
RP~
can drop to a point where the engine cuts out. An increase of more than 50 RPM while "leaning nut"
indicates an
excessively
rich idle mixture. An immediate decrease in RPM (if not preceded by a
momentary
increase) indicates the idle mixture is too lean.
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. Each time the adjustment is changed. the engine
should be run up to
:WOO
RPM to clear the engine before proceeding with the RPM check. Make final
adjustment 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.
7:\-0).
Fuel Air Bleed !'iollies.
7A-M. Removal Of Fuel Air Bleed Nozzles. The nozzles must be carefully removed as they or the
cylinders may be damaged.
a. Lift the side access panel of the engine cowling.
b. Disconnect the fuel line from the nozzle.
c. Carefully remove the nonle using the correct size deep socket.
d. Clean and inspect the nozzle as given in paragraph 7A-65.
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ISSl'ED: 8/18/72
2D17
POWER PLA'T