Piper Cherokee Six Service Manual page 416

PIPER CHEROKEE SIX SERVICE MANUAL
A959
5
and apply SLIPMARK
with Torque
Paint.
(Refer to Piper Service
Bulletin No. 53-7)
2
1. THROTTLE ARM
2. IDLE SPEED ADJUSTMENT
3. IDLE MIXTURE ADJUSTMENT
4. FUEL SCREEN
5. MIXTURE
ARM
6. THROTTLE CONTROL
CABLE
7. NUT M520365-1032C
Figure 7A-6.
Fuel Injector
7A-20. ADJUSTMENT OF IDLE SPEED AND MIXTURE.
a. Start the engine and warm up in the usual manner until oil and cylinder head
temperatures are normal. The electric fuel pump must be "ON" for b, c, d and e below.
b. Check magnetos. If the "mag-drop" is normal, proceed with idle adjustment.
c. Set throttle stop screw so that the engine idles at 550-600 RPM. If the RPM changes
appreciably after making the mixture adjustment during the succeeding steps, readjust the
idle speed to the desired RPM.
d. When the idling speed has been stabilized, move the cockpit mixture control
lever 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 ex-
ercised to return the mixture control to the "Full Rich" position before the RPM
can drop to a point where the engine cuts out. An increase of more than 50 RPM
while "leaning out" 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.
Revised: 7/29/77
POWER PLANT
2G20