Piper COMANCHE PA-24-180 Service Manual page 316

FIGURE 7-7. CARBURETOR
d. Adiust mixture and carburetor heat control by loosening the cutelled nut at the control arms and
sliding control cable through the stud until the 062 of an inch spnng back of the cockpit control is
obtained when the mixture is in the full rich position and the carburetor hea is in the fuU ram Lir posiion.
e
Tighten castelled nut and safen.
f.
Pull the throttle, mixture and carburetor heat controls in the cockpit full aft to ascertain that the
throttle arm contacts the idle screw and the mxture control arm contacts its idle cut off stop and the
carburetor heat flap valve is in the full carburetor heat position.
7-37. Adjusamnt Of Idle Speed And Mixure.
a. Start the engine and warm up in the usual manner until oil and cylinder head temperatures are
normal.
b. Check magnetos. If the "mag-drop" is normal, proceed with idle adjustment.
c. Close the throttle to idle. If the RPM changes appreciably after making the idle mixture
adjustment during the succeeding steps. readjust 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
2 B6
PIPER COMANCHE SERVICE MANUAL