Great Planes Spirit of St. Louis ARF - GPMA1151 - Manual (Page 14)

❏
1. Use denatured alcohol or other solvent to clean the
motor shaft on the motor that you will use. Roughen the
shaft with 320-grit sandpaper so glue will adhere.
❏
2. Without using tools, use your fingers to press the motor
all the way into the gearbox. Spin the shaft on the gearbox.
If there is resistance and the shaft does not spin freely, back
the motor out of the gearbox just enough to allow the shaft
to spin freely. Use a fine-point felt-tip pen to mark the motor.
This is how far the motor is to be installed after the pinion
gear is mounted.
❏
3. Remove the motor from the gearbox.
❏
4. The pinion gear fits onto the motor shaft easier one
way than it does the other. Using only your fingers (no
tools), determine which way is the easiest by test-fitting the
gear onto the shaft. The “easy way” is the way the gear goes
on and is to be permanently installed.
❏
5. Remove the pinion gear from the motor. Add a small
drop of the cement included with this kit to the hole in the
end of the gear that fits onto the shaft. Install the gear onto
the shaft. The end of the gear should be even with the end
of the motor shaft.
❏
6. Use a toothpick to apply a small dab of lubricating oil
to both ends of the motor shaft where it exits the motor. Do
not apply oil directly from the container because you may
apply too much.
❏
7. Reinstall the motor into the gearbox up to the line you
marked. If the motor does not fit tightly in the gearbox, use
a drop of CA to hold it in position. Fit the prop adapter to the
gearbox. Insert the appropriate nylon spacer ring into the
prop, then test fit the prop to the gearbox (be certain to use
the prop washer). If necessary, use a hobby knife to enlarge
the hole in the nylon spacer ring so it will fit onto the prop
adapter.
❏
8. Tighten the prop nut with an 8mm wrench. If
necessary, use a pliers to hold the drive washer while
tightening the prop nut. Wrap the drive washer with a cloth
to keep the pliers from marring it.
❏
9. Spin the propeller by hand. It should spin somewhat
freely, but due to the resistance of the motor and gear drive,
the propeller should not “coast” or freewheel indefinitely. If
there is much resistance, back the motor out of the gearbox
until the propeller spins as it should.
❏
10. Remove the propeller from the gearbox. Position the
motor and gearbox on the firewall. Using the holes in the
mounting tabs on the gearbox as a guide, drill three 1/16”
holes through the firewall for the mounting screws. Mount
the gearbox to the firewall with three wood screws.
Mount the Motor
14