Piper Navajo PA-31 Service Manual page 533

PIPER NAVAJO SERVICE MANUAL
TABLE VIIIA-I. PROPELLER SPECIFICATIONS (PA-31-300)
Blade Angle (1)
Low Pitch (High RPM)
High Pitch (Low RPM)
12.5
°
± 0.1
°
81
°
1
°
(Feathered)
(1) MEASUREMENT TAKEN
AT 30 INCH STATION.
Propeller RPM
Setting
Engine Static High RPM
Engine Static Low RPM
2700 RPM Max.
1900 ± 50 RPM
Min.
8A-7. PROPELLER GOVERNOR. Refer to Propeller Governor, Section VIII for removal
and installation instructions.
8A-8. RIGGING AND ADJUSTMENT OF PROPELLER GOVERNOR. (Refer to Figure
8A-1.)
a. Start the engine and warm in the normal manner.
b. To check high RPM, low pitch setting, move the propeller control all the way
forward to the INCREASE PROPELLER position. At this position the governor speed
control arm (1) should be against the high RPM fine adjusting screw (2). With the throttle
full forward, observe engine RPM, which should be 2700 RPM with high RPM properly
adjusted.
c. Should engine RPM not be as required, the high RPM setting should be adjusted as
follows:
1. Shut down the engine and remove the upper engine cowl.
2. Adjust the governor by means of the fine adjustment screw (2) for 2700 RPM.
To do this, loosen the high RPM fine adjustment screw locknut and turn the screw in a
clockwise direction to decrease engine speed or in a counterclockwise direction to increase
engine speed.
NOTE
One revolution of the fine adjustment screw will increase or
decrease the engine speed approximately 20 RPM.
3. Reinstall upper engine cowl and repeat step b to ascertain proper RPM setting.
4. After setting the proper high RPM adjustment, run the self-locking nut on the
fine adjustment screw against the base projection to lock.
5. Ascertain that the governor control arm (1) is adjusted to the proper angle on
the control wheel (3) as shown in Figure 8A-1.
Revised: 1/29/82
POWER PLANT
2K11