Piper Navajo PA-31 Service Manual page 959

PIPER NAVAJO SERVICE MANUAL
13-48. REASSEMBLY 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 reassembly of 41D07 combustion air
blower and motor:
1.
Place the spacer (12) over the end of the motor shaft and attach the motor assembly (13) to
the back plate (11) with the two self-locking nuts (23), flat washers (25) and lock washers (24).
2.
Slide the blower wheel (10) on the motor shaft and tighten the set screw lightly against the
flat portion of the motor shaft.
3. Place the blower housing (8) in position on the back plate (11) and install screws (18) and
lock washers (17).
4.
Attach the capacitor (7) at the point shown with the screw (18) and lock washer (17). The
motor ground lead terminal (16) can be grounded to the motor support bracket (3).
5.
Attach the inlet flange (6) and blower inlet adapter (2) to blower housing (8) with three
screws (18) and lock washers (17).
6. Loosen the allen set screw in the blower wheel (10) 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.
7. Slide the blower outlet adapter (5) on the blower housing outlet (8) and install the two
screws (18) and lock washers (17).
b. Refer to the following steps and Figure 13-32 for reassembly of 89D26-1 combustion air blower
and motor:
1.
Place the spacer (7) over the end of the motor shaft and attach the motor assembly (8) to
the inner housing half (21) with the two self-locking nuts (23) and washers (24).
2. Slide the blower fan (6) on the motor shaft and tighten the set screw lightly against the flat
portion of the motor shaft.
3. Place the outer half of blower housing (20) in position on the inner housing half (21) and
install attaching screws
4. Attach the capacitor (5) at the point shown with the screw (13). The motor ground lead
terminal (11) can be grounded to the motor support bracket (3).
5.
Attach the blower inlet adapter (2) to blower housing (20) with attaching screw (25).
6. Loosen the allen set screw (19) in the blower fan (6) and shift the fan on the motor shaft
until it is near the inlet in the blower housing. Tighten the set screw securely. The blower fan should just
clear the inlet flange when rotated at full RPM. Spin the blower fan by hand for clearance check; then
apply proper voltage to run motor and recheck for proper clearance.
Reissued: 10/12/79
HEATING AND VENTILATING SYSTEM
5D5