Hangar 9 P-51D Mustang 20cc Instruction Manual page 26

147. The prongs of the blind nuts will secure them in the back of
the fi rewall. Install all four M4 blind nuts at the time. Once
installed, remove the screws from the blind nuts.
148. Prepare the four M4 x 15 machine screws by sliding an M4
lock washer on the screw, then an M4 fl at washer.
149. Attach the motor box to the fi rewall using the four M4 x 15
machine screws prepared in the previous step. Place a drop
of threadlock on each screw before their installation, then use
a #2 Phillips screwdriver to tighten each screw.
150. The motor shaft must be repositioned to allow the installation
of the propeller adapter. Use a 1.5mm hex wrench to remove
the setscrew from the collar. Remove the collar and shim
from the motor shaft.
151. Use a 1.5mm hex wrench to remove the two setscrews that
secure the motor shaft to the motor bell housing.
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152. Use a press to carefully reposition the motor shaft so it
is fl ush with the face of the bell housing. Apply a drop of
threadlock on each of the setscrews. Replace the setscrews
and tighten them using a 1.5mm hex wrench.
 Make sure not to damage the motor
when repositioning the shaft.
153. Slide the shim on the motor shaft. Apply a drop of threadlock
on the setscrew. Slide the collar on the shaft and secure it to
the motor shaft using the setscrew and a 1.5mm hex wrench.
154. Attach the X-mount to the motor. Place a drop of threadlock
on each of the screws provided with the motor, then use a #2
Phillips screwdriver to tighten the screws attaching the mount
to the motor.
155. Attach the propeller adapter to the motor. Apply a drop of
threadlock on each of the screws. Use a 2.5mm hex wrench
to tighten the screws attaching the adapter to the motor.
156. Attach the motor to the motor box using four M3 x 15 socket
head cap screws, four M3 washers and four M3 blind nuts.
Place a drop of threadlock on each screw before their
installation. Tighten each screw using a 2.5mm hex wrench.
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