Piper COMANCHE PA-24-180 Service Manual page 307

PIPER COMANCHE SERVICE MANUAL
2.
SPRING RETAINER FRONT sCReW
3.STOP RING CLAMP SCREW
4.
SPEED
CONTROL LEVER CLAMP
SCREW
5. SPEED CONTROL LEVER
6.
STOP RING
FIGURE 7-4. WOODWARD PROPELLER GOVERNOR ADJUSTMENT POINTS
7-19. Adjustment Of Propeller Governor. (Woodward) (Refer to Figure 7-4.)
a.
Start the engine in accordance with the directions given in Owner's Operating Manual and allow to
warm up.
b. Push the "PROPELLER" cockpit control
far forward as it will go. At this position the governor
speed adjusting control lever will be against the hi-rpm fine adjusting screw.
c.
Observe engine speed. Adjust the governor speed by mean of the fine adjustment screw for 2700
rpm. To do this, release the fasteners and lift the left side engine cowling. Release the speed control lever
clamp screw (4) and move the lever relative to the cover serrations. One serration movement in a clockwise
direction produces a decrease in speed of 100 rpm; one serration counter-clockwise increases the speed 100
rpm. One revolution of the hi-rpm fine adjustment screw in a clockwise direction decreases engine speed 25
rpm. couner-clockwise rotation increases engine speed 25 rpm. for each revolution of the screw.
d.
After setting the engine rpm at 2700, tighten the control lever clamping screw, and run the
self-locking nut on the fine adjustment screw against the stop ring projection. Then safety-wire the head of
the screw to the projection.
e. With the high RPM adjustment complete, the control system should be adjusted so that the
governor control arm will contact the high RPM stop when the cockpit control is 062 of an inch from its
full forward stop. To adjust the control travel, disconnect the control cable end from the governor control
arm, loosen the cable end jam nut and rotate the end to obtain the desired control clearance. Reconnect the
cable end and tighten jam nut.
f.
It is usually only necessary to adjust the high RPM setting of the governor control system. as the
action automatically takes care of the positive high pitch setting.
g. Fasten the cowling on both sides.
POWER PLANT
ISSUED: 8/18/72
2 A21