❏
3. Place the four 1" (25 mm) x 1/4" (6 mm) x 20 engine
mounting bolts (not supplied) into the rear plate. Place a
socket that fits these bolts over the bolt heads and draw a
line around all four as shown in the above photograph.
Remove the wood from inside these four marks on the rear
plate only. Doing this will allow the socket to fit inside the
rear plate and countersink the bolt heads when the two
halves are assembled.
❏
4. The existing firewall on the model has centering marks
on the face of the firewall. Highlight and extend these lines
with a felt tipped pen as shown in the above photograph.
❏
5. Glue the two halves of the plywood mount together
using epoxy. Make sure that you assemble the two halves
with the center marks and engine outline on the front. Clamp
or add weight to the assembly and allow the epoxy to cure
completely. Saturate the 1/4" (6 mm) holes with thin CA.
Place the assembly onto the firewall and line up the
centering marks on the mount and the firewall. Mark four
locations at which you will place 8-32 x 1" (25 mm) socket
head cap screws and 8-32 blind nuts to secure the mount to
the firewall. Check the spacing between the location of the
engine and the edge of the mount. Drill 3/16" (4.8 mm) in
these four locations. Again, hold the mount in place on the
firewall and mark the locations of these holes on the firewall.
At these four marked locations drill 7/32" (5.6 mm)
clearance holes for the blind nuts.
❏
6. Install the four 8-32 blind nuts in the firewall in the
holes you just drilled. Install the mount onto the engine with
the four mounting bolts through the mount and into the back
of the engine. Next mount the engine to the firewall using
the four 8-32 x 1" (25 mm) socket head cap screws.
❏
7. Mark the location for the throttle push rod (the supplied
throttle pushrod will not be long enough for this purpose)
and drill a 1/8" (3 mm) hole through the mount, firewall and
the front former.
Note
: Be very careful to avoid the area where the gas tank
will be placed. Decide where you want to locate the throttle
servo and make a plywood mount for it at that location.
Note
: If the throttle servo mount will interfere with the
installation of the gas tank, move to the next section and
install the tank before installing your throttle servo. Be sure
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