Install The Engine; Mount The Cowl - GREAT PLANES Tiger Moth ARF Instruction Manual

Install the Engine

Tick marks for alignment
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1. Note: The proper thrust angle for the engine has been
built-in. Find the location markings on the firewall and use a
straight edge to draw lines between the horizontal and
vertical marks. Center the Great Planes engine mount
using the tick marks on the mount to match the lines on the
firewall. When satisfied with the location use a small punch or
sharpened wire on one end to mark the four engine mount
bolt holes to the firewall by making dimples in the wood.
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2. Drill four 7/32" [5.6mm] holes through the firewall at the
marks. Apply epoxy to the four 8-32 blind nuts, being careful
not to get the glue into the threads, and place them into the
holes on the back of the firewall. Attach the engine mount to
the firewall with four 8-32 x 1" socket head cap screws and
#8 flat washers. This will draw the blind nuts into the back of
the firewall. Allow the epoxy to cure.
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3. Place the back plate of the spinner on the engine.
Adjust the width of the mount to fit the engine. Center the
molded-in "tick" marks on the engine mount over the lines on
the firewall. Tighten the mounting bolts.
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4. Temporarily secure the engine to the mount with the
back plate of the spinner 5-3/4" [146mm] from the firewall.
A Great Planes Dead Center Engine Mount Hole Locator
(GPMR8130) works well to mark the location for the engine
mount holes onto the engine mount.
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5. Remove the engine from the mount. Drill four #29
[9/64" or 3.6mm] holes through the mount at the marks you
made. Tap 8-32 threads into the mount. Attach the engine to
the mount with four 8-32 x 3/4" socket head cap screws and
#8 flat washers.

Mount the Cowl

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1. Locate the cowl and as shown in the photo, remove
the formed portions of the cowl designed for engine cooling
with a sharp hobby knife or Dremel tool.
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2. With the engine mounted on the fuselage, place the
cowling on the fuselage and attach the spinner back plate.
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3. Position the cowl on the fuse so it is in alignment with the
spinner. Be certain there is at least a 3/32" [2.4mm] gap
between the front of the cowl and the back plate of the spinner.
❏
4. Drill a 3/32" [2.4mm] hole through the cowl and
mounting blocks in the positions shown. Apply thin CA to the
holes to reinforce the area. Enlarge the hole in the cowl
only with a 1/8" [3mm] drill bit. Mount the cowl to the
fuselage with four 2.5 x 8mm wood screws.
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