Hook Up The Throttle - GREAT PLANES Waco YMF-5 Instruction Manual

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2. Install the four 8-32 blind nuts on the firewall from the
back side. Use four 8-32 x 1" [25.4mm] SHCS with four #8
flat washers to help draw the blind nuts into the holes.
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3. Break the tangs out of the two engine mount halves.
File or trim away any portion that remains.
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4. Identify the six
glow engine spacers by
matching the bolt holes
on the spacers to the
bolt holes on the back
of the engine mount.
For this installation,
you will need three of
these spacers.
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5. Fit the two engine mount halves together. Using three
glow engine spacers behind the mount, loosely fit the mount
to the firewall using four 8-32 x 1-1/2" [38mm] SHCS, four #8
lock washers, and four #8 flat washers. Adjust the width of the
mount as you fit the engine. Slide the engine forward or back
on the mount until the drive washer is 6-11/16" [170mm] from
the face of the firewall. Hold the engine in place with two 1"
[25.4mm] adjustable clamps. With the engine in position, use
a Great Planes Dead Center
(GPMR8130) to drill four pilot holes or mark the position of
the holes onto the engine mount legs with a felt-tipped silver
marker.
™
Engine Mount Hole Locator
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6. Remove the engine from the mount. Remove the
mounts from the model. Drill and tap the holes for 8-32 bolts
using a tap and drill set (GPMR8103).
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7. Mix up some 30-minute epoxy and thin it down with a
little denatured alcohol. Glue the ply spacers together and
coat them with epoxy to fuelproof them.
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8. Install the engine mount with the ply spacers using four
8-32 x 1-1/2" [38mm] SHCS, four #8 lock washers, and four
#8 flat washers. For added security, use a drop of thread
locking compound on the screw threads. Then, install the
engine to the mount using four 8-32 x 1" [25.4mm] SHCS,
four #8 lock washers, and four #8 flat washers. Center the
engine mount marks with the cross-hairs on the firewall.
Tighten all screws.

Hook Up the Throttle

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1. Using a long drill bit, drill a 3/16" [4.8mm] hole through
the firewall in line with the engine's throttle arm. If you don't
have a long drill bit, mark the position of the throttle arm and
remove the engine before you drill the hole.
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2. Dry fit the 24" [610mm] gray outer pushrod tube in
the hole you just drilled. Slide the pushrod tube though the
access holes in the formers and back to the servo tray.
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