Great Planes Matt Chapman CAP 580 46 ARF - GPMA1280 - Manual (Page 13)

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2. Use a 3/16” [4.8mm] bit to drill through the firewall at
the marks on the engine mounting pattern.
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3. Install four 8/32 blind nuts into the backside of the firewall.
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4. Install the engine mount to the firewall using four each,
8/32 x 1" [25mm] socket head cap screws, #8 flat washers and
#8 lock washers. When installing the mount, use your engine
to determine the spacing needed for the mounting rails.
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5. Position the engine in the mount so the distance from
the front of the firewall to the front of the thrust washer
measures 5-3/16" [132mm]. Mark the location of the engine
on the mount. The Great Planes
® Dead Center ™ Hole
Locator (GPMR8130) works well for this. Drill through the
marks you have made on the engine mount with a #36 or
7/64” [2.5mm] drill bit. Tap each of the holes with a 6-32 tap.
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6. Mount the engine onto the mount with four each,
6-32 x 1” [25mm] socket head cap screws, #6 flat washers
and # 6 lock washers.
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7. Assemble the fuel tank as shown. Insert the tank into
the formers in the front of the fuselage.
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8. Locate the plywood receiver tray and Velcro. Install
the Velcro into the slots.
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9. Place the tray into the fuselage. The front tongue on
the tray extends forward to hold the fuel tank in position. Drill
a 1/16" [1.6mm] hole through the holes on each side of the
tray. Then screw a #2 x 3/8" [9.5mm] sheet metal screw and
a #2 flat washer into the mounting rails to secure it in place.
❏
10. Install the fuel line onto the tubes extending from the
fuel tank. The vent line can be attached later when the
muffler is permanently installed. If you will be using a fuel
valve (not included) for filling the tank rather than filling the
tank by removing the line from the carburetor, install it in the
fuel line following the instructions included with the valve.
❏
11. Mark the location on the firewall where the throttle
pushrod will pass through. Drill a 3/16” [4.8mm] hole on that
mark. Locate the 24” [610mm] gray plastic pushrod tube. Cut
it to a length of 12” [305mm]. Roughen one end of the tube
with 220-grit sandpaper. Install the smooth end of the
pushrod tube into the front of the firewall through the hole
you drilled in the firewall and through the hole inside the
fuselage, in the fuselage former. Apply CA to the roughened
end of the plastic tube gluing it into the firewall.
FUEL TANK
SILICONE
FUEL LINE
FUEL
PIPE
FUEL CLUNK
PRESSURE
TAP TO
MUFFLER
TO NEEDLE
VALVE
FIREWALL
13