Idle Speed And Mixture Adjustment - Piper PA-24 Comanche Service Manual

PIPER COMANCHE SERVICE MANUAL
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FIGURE 7·7. CARBURETOR
d. Adjust mixture and carburetor heat control by loosening the cutelled nut at the control anns and
sliding control cable throulh the stud until the
.062
of
an
inch spril'll back of the cock!,it control is
obtained when the mixture is in the full rich position and the carburetor heat is in the full ram air position.
e
Tighten casteUed nut and safety.
f. Pull the throttle. mixture and carbureror heat controls in the cockpit full aft to as<el"tain that the
thrcrtle um contactS the idle screw and the mixture control arm contaet1 its idle CUt off StOP and the
carburetor neat flap valve is in the full carburetor hut position.
7-37. Adjusanent Of Idle Speed And Mixture.
a. Start the engine and wann up in the usual
manner
until oil and cylindcr head temperaturcs
are
normal.
b. Check lrl.lJftCtos. If the "mq-drop" is normal. proceed with idle adjusanent.
c. Close the throttle to idlc. If the RPM chanps 'Jlpreciably aiter makinl the idle mixture
adjustment durina the succeeding steps. l'ftdJusc the idle speed to the desired RPM.
NOTE
The idle mixture must be adjusted with the fuel boost pump "ON".
POWER PLANT
ISSUED: 8/18/72
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