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❑
Slide the cowling over the engine and onto the fuselage.
❑
With the cowling temporarily in place, secure the spinner
backplate onto the engine's crankshaft.
❑
Line up the front of the cowling using the backplate as
your guide. When aligned properly, the cowl ring should be
centered with the spinner backplate and there should be about
a 1/16" - 3/32" gap between the two.
❑
When satisfied with the alignment, use pieces of masking tape to hold the cowling securely in place and aligned.
IMPORTANT
The sides and top of the cowling will overlap the fuselage. The bottom of the cowling should be flush with
the front of the firewall.
Step 2: Installing the Cowling
❑
With the cowling held firmly in alignment, drill 5/64"
diameter pilot holes into the cowling and through the fuselage
for the four wood screws. Locate two holes on each side of
the cowling, 1/4" in front of the back edge of the cowling. One
hole should be 1/2" up from the bottom, and the other hole
should be 1/2" down from the top.
❑
Remove the cowling and enlarge
only
the holes in the cowling using a 1/8" drill bit.
☞
Enlarging the holes will prevent the fiberglass from being cracked when you install the wood screws.
❑
To strengthen the holes in the fuselage that the wood screws will thread into, carefully apply a couple of drops of thin
C/A into the holes and let it dry completely before installing the cowling.
❑
At this time you should make the rest of the cutouts in the cowling for your engine. These include cutouts for the high
and low speed needle valves and the muffler assembly.
❑
When you're satisfied with the fit and alignment, slide the cowling back into place. Install the cowling using four
3mm x 10mm wood screws and four 3mm flat washers. Tighten the screws firmly to secure the cowling into place.
❑
Install the needle valve and muffler assembly onto your engine, then cut to length and install the fuel lines to the
muffler pressure nipple and the carburetor (or remote needle valve).
❑
Install the spinner backplate and the propeller onto your engine and tighten the propeller nut firmly.
Step 3: Installing the Spinner Assembly & Engine Accessories
