Rigging And Adjustment Of Propeller Governor; Propeller Governor View - Piper Navajo Chieftain PA-31-350 Service Manual

NAVAJ CHIEFTAIN SERVICE MANUAL
220
1. CONTROL ARM
2. RPM ADJUSTING SCREW
3. CONTROL WHEEL
4. LOCKNUT
5. BOLT ASSEMBLY
Figure 8-5. Propeller Governor
8-26. RIGGING AND ADJUSTMENT OF PROPELLER GOVERNOR. (Refer to Figure 8-5.)
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
2575 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 2575 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 8-5.
Reissued: 9/23/80
POWER PLANT
2H16