(temporarily mounting the spinner backplate to the engine and
using 1/16” scrap balsa “spacers” makes this accurate). Slide the
aluminum motor mount rails against each side of the engine case,
making sure the engine is centered at the front. With the engine
and aluminum mounts in this position, lightly tighten the four motor
mount bolts to hold the aluminum rails in place.
Remove the
engine.
❑
3) Use alcohol or acetone to clean the bottom surfaces of the
engine mounting lugs, removing any oil or grease. Do the same
thing to the tops of the aluminum motor mount rails, (still bolted in
place in the nose). Apply 3 or 4 small drops of thin CA glue to the
bottom of each mounting lug on the engine. Carefully place the
engine back into the nose of the airplane, positioning it with the
proper 1/16” - 3/32” clearance for the spinner backplate. Hold the
engine in place to the aluminum rails and use a little accelerator to
set the CA glue.
❑
4) Loosen and remove the four bolts holding the aluminum
rails in place and carefully remove the engine and aluminum rails
from the nose of the model.
❑
5) Use a shortened pencil with a sharp point to mark the
locations of the engines mounting holes onto the aluminum motor
mounts. Tap the aluminum mounting rails to remove them from the
engine. Use the pencil marks to drill clearance holes through both
motor mounts for the engine mounting bolts (not supplied). When
using typical 6-32 socket head bolts for mounting the engine, these
holes should be made with a 9/64” dia. drill bit.
❑
6) Use your mounting hardware to now secure the engine in
place to the aluminum rails. We used and recommend 6-32 socket
head bolts and lock nuts for this purpose. Note that in order to fit
without interference, the threaded length of the mounting bolts
must be trimmed to no longer than 9/16”. Re-install the engine -
mounted on the aluminum rails - back into the nose of the model
and temporarily secure the rails with the four M3 x 20mm bolts.
The engine is now basically in place, ready for final mounting.
What remains is to accurately locate and open the required
clearance holes for the engine’s manifold/muffler pipe, needle
valve and any other required openings for your particular engine.
❑
7) Use a non-permanent marker pen to mark the approximate
position of the muffler manifold pipe onto the bottom surface of the
fuselage, where it will exit. Likewise, use a pencil to mark the
approximately centered location of the engines’ needle valve onto
the inside surface of the engine compartment. Remove the engine
and aluminum motor mounts.
Use a Dremel
®
Tool and drum sanding bit to open a small, half-
round opening in the side of the fuselage to allow clearance for the
engine’s manifold pipe. Leave about 3/32” clearance around the
surface of the pipe. Sand the edges of this opening smooth.
To make the needle valve exit hole, begin by using a pair of pliers
and a sharp pin. Grip the pin tightly with the pliers and push the
pin through the fuselage, at the needle valve mark made earlier.
This discloses the location of the mark on the outside of the
fuselage. Drill a 1/8” dia. hole through the pin hole. Put the engine
in back in place and check the position of the hole with the needle
valve opening in the carburetor. Adjust the hole to center it exactly
10
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