Install The Engine & Throttle Servo - GREAT PLANES PT-17 Stearman Instruction Manual

Install the Engine & Throttle Servo
1. Cut the tabs from the engine mount. Install the engine
mount (inverted) to the firewall with four 8-32 x 1-1/4"
[32mm] socket head cap screws, #8 flat washers and #8
lock washers.
2. Position the engine on the mount so the distance from
the firewall to the front of the thrust washer measures 6-1/4"
[159mm]. Mark the location of the engine on the mount. The
Great Planes Dead Center
works well for this. Drill through the marks you have made
on the engine mount with a #29 or 9/64" [3.6mm] drill bit.
Tap each of the holes with an 8-32 tap.
3. Install the engine onto the mount with four each, 8-32
x 1" [25mm] socket head cap screws, #8 flat washers and
#8 lock washers.
™ Hole Locator (GPMR8130)
4. Drill a 3/16" [4.8mm] hole through the firewall in line
with the throttle arm on the carburetor.
5. Locate the 24" [610mm] gray plastic pushrod tube and
cut it 12-3/4" [324mm] in length. Sand one end of the tube with
220-grit sandpaper. Insert the tube into the firewall. Glue the
roughened end of the tube flush to the firewall.
6. Place your throttle servo into the servo tray as
shown. Drill a 1/16" [1.6mm] hole through each of the
mounting holes. Remove the servo. Then install and remove
a servo mounting screw into each hole. Apply a couple
drops of thin CA into the holes to harden the threads. When
the glue has cured permanently, mount the servo to the
servo tray.
7. Cut the 1" [25mm] threaded end from the .074" x 17-1/2"
[445mm] throttle pushrod wire. Install the wire into the tube
and attach it to the servo horn arm with a FasLink. Use the
same technique used for the ailerons.
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