Mount The Engine & Install The Fuel Tank - GREAT PLANES Extra 300S Instruction Manual

Insert short dowels or a couple of screwdrivers into the
wing bolt holes and wrap the dowels with rubber bands for
additional clamping power at the rear of the wing. Be
certain the trailing edges align. Use a tissue dampened with
alcohol to wipe away any more epoxy that oozes out of the
wing, then set the wing on one of its tips leaning against a
wall. Do not disturb the wing until the epoxy has fully cured.
Mount the Engine & Install the Fuel Tank
1. Cut the spreader bar from both engine mount halves
and trim any remaining plastic so the halves slide together.
Temporarily mount your engine mount to the firewall as
shown in the sketch with four 6-32 x 1" SHCS (socket head
cap screws), #6 lock washers and #6 flat washers but don't
tighten the screws all the way yet.
2. Adjust the engine mount so it will fit your engine.
Tighten the engine mount screws. Temporarily place the
back plate of the spinner included with this kit on your
engine. Refer to the following photo. Position your engine
on the mount so the spinner back plate is 5-1/8" from the
firewall. Hold your engine to the mount with small clamps or
something similar.
3. Mark the location of the engine mounting holes on the
engine mount. We use the Great Planes Dead Center Engine
Mount Hole Locator (GPMR8130) shown in the photo.
4. Remove your engine from the mount and drill 7/64"
holes at the marks you made. Add a drop of household oil
to the holes in the mount (so it will be easier for you to
install the screws), then mount your engine to the mount
with four #6 x 1" screws and #6 flat washers. Hint: If you
have a drill press (or if you can borrow your friend's),
remove the engine mount from the firewall and drill the
holes using the drill press.
Note: Some modelers prefer to mount their engines with
machine screws (not included) rather then the sheet metal
screws supplied with this kit. The Great Planes Adjustable
Engine Mounts accept threads well, so if this is your choice
use the appropriate drill and tap for the screws you intend
to use. 4-40 Screws are acceptable but use 6-32 screws if
they will fit into your engine. Tap the threads into the holes
and mount your engine.
5. Remove the spinner back plate from your engine,
then slip the cowl over the front of the fuse. If the head of
your engine interferes with the cowl, you can temporarily
remove the head, or cut a hole in the cowl just large
enough to accommodate the engine. After the cowl is
mounted, you can enlarge the hole to allow some
clearance for a more finished appearance.
6. Reinstall the spinner. Align the front of the cowl with
the spinner and tape it to the fuselage. Use the stripes on
the cowl and the fuselage as a cue for alignment.
7. Position one of the 1/2" x 1/2" x 3/4" hardwood cowl
mounting blocks at the aft edge of the left side of the cowl
near the top. Use a ballpoint pen to mark the aft edge of the
cowl on the cowl mounting block. Mark the remaining three
cowl mounting blocks the same way for the left side of the
cowl near the bottom and the right side of the cowl near the
bottom and the top.
8. Trim the cowl mounting blocks along the lines you
marked in step 7.
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