Engine Cowling - Piper Navajo PA-31 Service Manual

1. COWL, UPPER
2. COWL, LOWER
3. COWL FLAP
4. DOOR, LOUVER
DOOR, OIL ACCESS
6. FASTENER, COWL
7. FASTENER, SCREW, COWL
8. FASTENER, COWL
9. FASTENER,COWL
10. BOLT,FASTENER
11. ROD, COWLFLAP
12 RODEND
8-7. ENGINE COWL FLAP.
PIPER NAVAJO SERVICE MANUAL
CAUTION
1. INSURE THAT THE FUEL
DRAIN VALVE IN THE
BOTTOM OF THE
CRANKCASE EXTENDS
THROUGH 1 HOLE A
AND THE INDUCTION AIR
DUCT DRAIN LINE EX-
TENDS THRU 1 HOLE B.
2. INSURE THAT THE OIL
BREATHER TUBE IS
ASSIGNED WITH 1 HOLE
C AN IS WITH 1/4 INCH
OF THE COWL SKIN, BUT
DOES NOT EXTEND
BELOW IT. THE SCARF
ON THE BREATHER TUBE
SHOULD POINT FOR-
WARD.
COWLING
FASTENER LOCKED
POSITION STRIPE
(1 PER FASTENER)
Figure 8-1 Engine Cowling
8-8. REMOVAL OF COWL FLAP TRANSMISSION. (Refer to Figure 8-2.)
a. Remove the access plate on the top and left side of the engine nacelle just aft of the firewall.
b. Disconnect the electrical leads at the transmission motor.
c. Disconnect the transmission actuating rod (9) from the torque tube arm (15).
d. Disconnect the transmission (8) from its mounting bracket (7) and remove it from the engine nacelle.
e. The torque tube (11) may be removed by disconnecting the two cowl flap control rods (12) from the
torque tube and unriveting arm extensions (2). both at the forward side of the firewall, and removing the cap
bolts (13) that secure the torque tube bearing blocks (14).
8-9. CLEANING, INSPECTION AND REPAIR OF COWL FLAP TRANSMISSION.
a. Clean the transmission assembly with a suitable solvent.
b. Inspect the transmission tube (5) for excessive end or side play on the transmission screw (6).
c. Ascertain that the transmission tube (5), screw (6), and rod (9) are not distorted or bent.
d. Check that the screw bearing is not loose on the transmission screw (6) or within the transmission hous-
ing (8). Excess wear can be determined by holding the transmission and moving the screw up and down.
e. Check for excess wear within the transmission (8) by turning the screw (6) by hand and noting the end
and side play in the transmission drive shaft. End play should not be great enough to cause end pressure on the
motor drive shaft.
Revised: 2/18/94
POWER PLANT
2H12