Piper Navajo PA-31 Service Manual page 534

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1 CONTROL ARM
2. RPM ADJUSTMENT SCREW
3. CONTROL WHEEL
4. LOCKNUT
5. BOLT ASSEMBLY
Figure 8A-1. Propeller Governor
d. 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 lever is .062
to .125 inch from its full forward stop, which is located in the control pedestal. To adjust
the control lever travel, disconnect the control cable end from the control arm, loosen the
cable end jam nut and rotate the end to obtain the desired lever clearance. Reconnect the
cable end and tighten jam nut.
e. 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.
8A-9. ENGINE.
8A-10. REMOVAL OF ENGINE. (Refer to Figure 8A-2.) The removal of either engine is
basically the same procedure, though the routing of some wires, cables, lines, etc., do vary
between engines. Each line should be identified to facilitate reinstallation and covered,
where disconnected, to prevent contamination.
a. Turn off all cockpit switches and then disconnect the battery ground wire at the
battery.
b. Move the fuel valve control lever located on the outboard side of the fuel selector
panel, labeled "Emergency Fuel Shut-off" to the OFF position.
c. Remove the engine cowling per Removal of Engine Cowling, Section VIII.
d. Remove the access panels on the top, sides and inboard bottom of the nacelle, just
aft of the fire wall.
e. Drain the engine oil, if desired, and reinstall drain plug.
f. Remove the propeller per Removal of Propeller, Section VIII.
Reissued: 10/12/79
POWERPLANT
PIPER NAVAJO SERVICE MANUAL
2K12