Mount The Glow Engine - GREAT PLANES PT-19 Instruction Manual

12. Test-fi t the battery into place with the straps. The
fi nal location of the battery will be determined during the
C.G. procedure.
Skip to Mount the Cowl on page 16.

Mount the Glow Engine

The instructions illustrate installation of an O.S. Max .46 AX
with the O.S. muffl er. If using a different engine and/or muffl er,
slight adjustments may be required in the way your engine
is rotated on the fi rewall. As long as the four engine mount
screws are positioned over the circle inscribed on the fi rewall,
the engine will be in the correct location.
1. Drill 1/16" [1.6mm] pilot holes through the "X" marks in
the fi rewall, then enlarge the holes with a 5/32" [4mm] drill. If
using an engine or muffl er other than the O.S. .55AX/Bisson
Pitts-style muffl er, the engine mount may need to be rotated
differently around the circle embossed in the fi rewall. However
you orient your engine, be sure to keep all four engine mount
holes on the circle embossed in the fi rewall so your engine
and mount will be positioned properly.
2. Press 6-32 blind nuts into the holes in the back of
the fi rewall.
3. Cut the "spreader bar" from both halves of the included
engine mount and trim off any remaining material so they
fi t together well.
4. Temporarily mount the engine mount with four 6-32 x
1" [25 mm] screws and lock washers and fl at washers, but
don't tighten the screws all the way yet.
5. Position the engine on the mount so the drive washer
will be 4-7/8" [120mm] from the fi rewall. Tighten the engine
mount screws and hold the engine in place with a clamp.
6. Use a Great Planes Dead-Center Hole Locator or
similar tool to mark the engine mount bolt hole locations
onto the mount.
7. Remove the engine and drill #36 (.106" [2.7mm]) holes at
the marks, then tap 6-32 threads into the holes—if available,
a drill press is preferred for drilling the holes and the tap may
be chucked in a hand drill to tap the threads.
8. Mount the engine to the mount with four 6-32 x 3/4"
[19 mm] Phillips screws and #6 lock washers.
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