Hangar 9 Alpha 40 ARF Assembly Manual page 7


Step 4
Place a #4 washer on each of the four 4-40 x 1-inch socket
head bolts. Slide the screws through the holes in the engine
mount flange.
Hangar 9 Alpha 40 ARF Assembly Manual

Step 5
Place the engine on the mounting rails. The screws will go
through the holes in the rails. Thread a 4-40 locknut on each
screw. The nuts are only finger-tight at this time.

Step 6
Use a 9/64-inch hex wrench or ball driver to tighten the
screws that attach the mount to the firewall. Make sure the
blind nuts are drawn into the back of the firewall. Also make
sure you have placed a small amount of threadlock on each
of the screws so they don't vibrate loose in flight.

Step 7
Use a 3/32-inch hex wrench or ball driver and a 1/4-inch
nut driver to tighten the hardware securing the engine to the
engine mounting rails.
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