Piper Navajo PA-31 Service Manual page 947

PIPER NAVAJO SERVICE MANUAL
13-46. REPAIR OFCOMBUSTION TUBE ASSEMBLY. No weld or braze repairs ofthecombustion tube
assembly are authorized.
13-47. REASSEMBLY. (Refer to Figure 13-27, 13-28 or 13-29.)
a. Reassemble the 39D59 heater giving special attention to the following instructions: (Refer to
Figure 13-27 or 13-28.)
1. If removed during disassembly slide the base plate (54) into position on the stem of the
nozzle holder and slide the coil (53) into position on the solenoid valve assembly. Install the "O" ring (52),
cover (49), screw (50) and lock washer (51), then tighten the screw securely. Be careful to avoid pinching
the wire leads connected to the solenoid core.
2. Insert the ventilating air motor (44) into the motor bracket assembly (32), slide the blower
fan (40) on the end of motor shaft and rotate it until the set screw is aligned with the flat side of the motor
shaft. Tighten the set screw just tight enough to hold it at this time.
3. Attach the capacitor and leads assembly (41) to the motor bracket (32) with the screw (42)
and lock washer (43). Make sure a good electrical ground connection is made at this point.
4. Insert this assembly into the blower housing (39) and position it so the long screw (33) is in
alignment with the gap on the inner ring of the motor bracket assembly (32). This is the screw used to
secure and align the motor in the bracket.
5. Slide the flat washer (36) into position between the legs of the motor bracket (32) and
blower housing (39).
6. Make sure all wires are routed and grommeted as they were prior to disassembly and install
the two screws (34), flat washers (37) and new grommets (38) at the two lower edges securing the motor
bracket assembly (32). Then install the grommet (38), flat washer (37), nut (35) and screw (33) in the
remaining (upper) corner of the motor bracket assembly (32).
7. Center the motor bracket (32) in the housing and tighten the screw (33) to secure it. The
motor (44) should be positioned in the bracket (32) to locate the blower wheel (40) properly in the blower
housing (39). The blower wheel should be positioned so it will rotate freely and just clear the contoured
spill plate in the blower housing. Tighten the allen-head set screw and spin the blower wheel by hand for a
clearance check. Then apply appropriate voltage to run the motor as a final clearance check.
Revised: 10/12/83
HEATING AND VENTILATION SYSTEM
5C17