Piper Navajo PA-31 Service Manual page 543

PIPER NAVAJO SERVICE MANUAL
TABLE VIIIB-I. PROPELLER SPECIFICATIONS
Blade Angle
Low Pitch (High RPM)
13.2° ± 0. 1°(1)
High Pitch (Low RPM)
82
°
± 1.0 (1)
(Feathered)
(1) MEASUREMENT
TAKEN AT 30 INCH STATION.
Propeller RPM
Engine Static High RPM
2575 RPM Max.
Setting
Engine Static Low RPM
1900 ± 50 RPM
Min.
8B-8. ENGINE.
8B-9. REMOVAL OF ENGINE. (Refer to Figure 8B-1.) The removal of either engine is
basically the same procedure, though the routing of some wires, cables, lines, etc., does 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.
g. Disconnect the starter cable at the starter; remove the cable clamps at the left side of
the engine and engine mount, and draw the cable aft through the engine baffle to the fire
wall.
h. Disconnect the alternator primary cable that leads from the fire wall at the filter box
located on the left lower side of the engine mount. Disconnect the field wire.
i. Disconnect the electrical leads to the oil temperature sender at the accessory
housing; the cylinder heat temperature probe at the aft outboard cylinder and the exhaust
temperature at the aft side of the exhaust manifold.
j. Disconnect the magneto ground leads and the retard spark lead at the magneto.
k. Disconnect the propeller deicer electrical wires (optional equipment).
1. Disconnect the pressure pump hose at the upper left side of the fire wall.
m. Disconnect the tachometer drive cable at the engine accessory housing.
n. Disconnect the throttle and mixture control cables at the injector; the governor
control cable at the governor and the alternate air door control cable at the left side of the
air filter plenum. Disconnect the cables from their attachment clamps.
Revised: 1/29/82
POWER PLANT
2K21