Repair Of Combustion Tube Assembly - Piper Navajo Chieftain PA-31-350 Service Manual

NAVAJO CHIEFTAIN SERVICE MANUAL
WARNING
Be sure to keep the atomized spray away from fire.
4.
Energize and de-energize the solenoid several times. The spray should shut off permanently
each time the solenoid is de-energized. There should be no sign of dribbling at the nozzle tip in excess of
one or two drops.
5. If the spray pattern is distorted, check for an obstruction and clean the nozzle as described
in Paragraph 13-42, i. If this fails to provide a normal spray pattern, replace the nozzle.
6. If the nozzle continues to dribble, the solenoid valve is not closing properly and the solenoid
valve must be replaced.
13-44. REPAIR OF COMBUSTION TUBE ASSEMBLY. No weld or braze repairs of the combustion tube
assembly are authorized.
13-45. REASSEMBLY. (Refer to Figure 13-17.)
a. Insert the ventilating air motor (32) into the motor bracket assembly (33): slide the blower fan
(34) 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.
b. Attach the capacitor and leads assembly (31) to the motor bracket (33) with the screw and
lock washer. Make sure a good electrical ground connection is made at this point. Install ground bracket
and three new fasteners (40).
c. Insert this assembly into the blower housing (41).
d. Make sure all wires are routed and grommeted as they were prior to disassembly and then secure
the assembly in housing with three screws (39).
e. The motor (32) should be positioned in the bracket (33) to locate the blower fan (34) properly
in the blower housing (41). The blower fan 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 fan by
hand for a clearance check; then apply appropriate voltage to run the motor as a final clearance check.
Revised: 3/5/84
4C15
HEATING AND VENTILATING SYSTEM