Piper Navajo PA-31 Service Manual page 939

PIPER NAVAJO SERVICE MANUAL
CAUTION
Handle the nozzle with care to avoid damage to the tip. The
material around the orifice is very thin and any sharp blow on the
face of the nozzle can distort the spray pattern and cause
malignition or improper combustion.
16. Remove the screw (50), lock washer (51), cover (49) and "O" ring (52). Then carefully slide
the solenoid coil (53) off the valve assembly. It is not necessary to remove the base plate (54) unless it is
warped.
17. Loosen the nut (35) and remove the screw (33), flat washer (37) and rubber grommet (38)
from the blower housing.
18. Remove the two screws (34), flat washers (37) and rubber grommets (38) at the other two
locations around the blower motor housing (39).
19. Slide the ventilating air blower motor out of the blower housing (39) with the motor
bracket assembly (32) and blower wheel (40) attached. Loosen the set screw in the blower wheel (40) and
slide it off the end of the motor shaft. The flat washers (36) and rubber washers (37) will fall out when the
bracket is removed. Then remove the motor bracket assembly (32). If these parts are in good condition,
they need not be disassembled further.
20. Remove the screw (42) and lock washer (43) to free the capacitor assembly (41) with
attached leads.
b. Disassemble the B39D59 heater giving special attention to the following instructions: (Refer to
Figure 13-29.)
1. Remove the screw and slide the elbow adapter (23) off the combustion air inlet tube.
2. Disconnect and remove electrical wiring and individual wires from the various components
on the heater. If wires appear to be in good condition, it may be desirable to remove wire harness assembly
intact. First, disconnect wires at terminal strip and components.
NOTE
It is advisable to label all wires, prior to removal, to insure correct
connections during reassembly. Cable straps and clips must be
replaced if removed, as they cannot be reused.
3. Carefully disconnect the high-voltage ignition lead at the spark plug. Handle the spring
connector on the end of this lead with care to prevent fouling or damage.
4. Remove the four screws to free the ignition assembly (2) from the heater jacket and remove
the ignition assembly. The vibrator (3) and coil (4) may be removed by loosening the clamp and pulling
units straight away from the ignition assembly case.
5. Remove the grommet (39) from the jacket (5) and remove the spark plug (32) with a 7/8
inch deep socket. Make sure the spark plug gasket is removed.
6. Remove the two screws and lift out the overheat (limit) switch (25) and spacer gasket (27).
7. Remove the two screws and lift out the cycling switch (24).
8. Remove the two screws to release the terminal strip (35) and insulator (36) from the
ignition.
9. Disconnect the tube fittings at the combustion air pressure switch (26). (Refer to Paragraph
13-36, Step a, No. 1, for precaution on tube bending.) Unscrew and remove the combustion air pressure
switch (26) from the combustion air inlet tube.
Reissued: 10/12/79
HEATING AND VENTILATING SYSTEM
5C9