Reassembly Of Combustion Air Blower Assembly; Test Procedure (Heating And Ventilation) - Piper Navajo Chieftain PA-31-350 Service Manual

NAVAJO CHIEFTAIN SERVICE MANUAL
q.
Rotate the combustion air pressure switch (17) onto the threaded fitting on the combustion air
tube and tighten it firmly.
r. Slide the grommet over the combustion air tube and connect the tube to the fitting on the
combustion air pressure switch ( 17).
s. Install the wiring harness and connect all wire leads to their respective terminals. (Refer to the wiring
diagram, Figure 13-6.) Place the grommet (38)(Figure 13-17) in position in thejacket(l);
locate the ventilating
air blower at the end of the jacket. Thread the quick-disconnect on the motor leads through the grommet (38)
and connect it to the mating connector on the wiring harness.
t. Place the blower housing in position on the jacket assembly (1) and secure it by installing the
four screws, if removed at disassembly. This operation is easier if the screws are started into their threads
and the blower housing rotated into place, allowing the screws to enter the notched openings in edge of
blower housing. Tighten all screws securely.
u. Install the adapter (16) with the screw.
13-46. REASSEMBLY OF COMBUSTION AIR BLOWER ASSEMBLY. (Refer to Figure 13-18.)
a. Place the spacer (9) over the end of the motor shaft and attach the motor assembly to the inner
housing half (10) with the two self-locking nuts (14), flat washers (13) and lock washers (1 2).
b. Slide the blower wheel (15) on the motor shaft and tighten the set screw lightly against the flat
portion of the motor shaft.
c. Place the outer half blower housing (16) in position on the inner housing half (10) and install
screws ( 1).
d.
Attach the capacitor (7) at the point shown with screws. The motor ground lead terminal can be
grounded to the motor support bracket (1).
e. Loosen the Alien set screw in the blower wheel (15) and shift the wheel on the motor shaft until
it is near the inlet in the blower housing. Tighten the set screw securely. The blower wheel should just clear
the inlet flange when rotated at full RPM. Spin the blower wheel by hand for clearance check: then apply
proper voltage to run motor and recheck for proper clearance.
f. Attach the blower inlet adapter (18) to blower housing (16) with three screws (17) and lock
washers.
13-47. TEST PROCEDURE.
13-48. GENERAL INFORMATION. A test of all components should have been made after overhaul to
insure proper operation. Some shops may not have complete testing facilities for measuring air flows.
pressure drops, and other factors which would be accomplished in a laboratory-type test. If such a test
cannot be made, install the heater and check operation on the ground and in the air to determine if
operation is normal. In shops where complete test equipment is available and a complete functional test can
be performed, the test routine described in subsequent paragraphs should be made.
Reissued: 9/23/80
HEATING AND VENTILATING SYSTEM
4 C19