Piper Navajo PA-31 Service Manual page 940

PIPER NAVAJO SERVICE MANUAL
10. Loosen the four fasteners (20) and rotate the blower and motor housing (12) to disengage
the notched end from the four screws in the end of the heater jacket.
11. Remove grommet from fuel shroud and carefully pull solenoid wires through the hole in the
shroud. Remove fuel solenoid (22) with open end wrench.
12. Reach inside the inlet end of the jacket assembly (5) with a 3/4 inch open-end wrench and,
while holding the fuel-tube fitting at the jacket, remove the elbow fitting (34), nut (38), washer (41), gasket
(29) and fuel shroud.
13. Remove the two screws and carefully withdraw the nozzle holder assembly (8) from the
combustion head assembly (6). Remove the six screws that attach combustion head assembly to
combustion-tube. Remove combustion head assembly and gasket (30).
14. Remove the screws and remaining cable straps, if not previously removed, from the seam of
the jacket assembly (5). Note positions of cable straps as they are removed. Spread the jacket (5) at the
seam and remove it from the combustion tube assembly (7). This will free the rope gasket (31) which can
be removed from the particular part which it remains attached.
15. Carefully unscrew and remove the spray nozzle (21) from the nozzle holder assembly.
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
mal-ignition or improper combustion.
16. Remove the three screws and rubber grommet from the blower motor housing (12).
17. Slide the ventilating air blower motor out of the blower housing (12) with the motor
bracket assembly (19) and blower fan (17) attached. Loosen the set screw in the blower fan (17) and slide
it off the end of the motor shaft. The ground bracket (44) and rubber fasteners (43) may fall out when
bracket is removed. Then remove the motor bracket assembly (19).
18. Remove the screw to free the capacitor assembly (18) with attached leads.
13-41. DISASSEMBLY OF COMBUSTION AIR BLOWER ASSEMBLY. (Refer to Figure 13-30, 13-31 or
13-32.)
a. Refer to the following steps and Figure 13-30 or 13-31 for disassembly of 41 D07 combustion air
blower and motor.
1. Remove the combustion air blower inlet adapter (2) by removing three screws, lock washers,
cover plate and gasket.
2. Remove the outlet adapter (5) by removing the two screws (18) and lock washers (17).
3. Remove the inlet flange (6) by removing the three screws (18) and lock washers (17).
4.
Remove screws (18) and lock washers (17), then separate the back plate (11), with motor
(13) attached, from the blower housing (8) and free the motor leads and capacitor (7) from the back plate
(11).
5. Loosen the set screw in the blower wheel (10) and slide if off the motor shaft.
6. Remove the two hex nuts (23), lock washers (24) and flat washers (25), and slide the back
plate (11) off the motor through bolts. The spacer (12) will drop out.
7. Install new motor brushes as described in Paragraph 13-26, Step b. If the motor commutator
is badly worn, or if the motor is defective in any respect, it must be replaced.
b.
Refer to the following steps and Figure 13-32 for disassembly of 89D26-1 combustion air blower
and motor.
1.
Remove the combustion air blower inlet adapter (2) by removing attaching screw (25).
2. Remove the housing outer half by removing the four screws.
3. Loosen the set screw (19) in the blower wheel (6) and slide it off the motor shaft.
Reissued: 10/12/79 HEATING AND VENTILATING SYSTEM
5C10