48
Hangar 9 Jackal 50 ARF
4. Attach the engine mount rails to the firewall using four
8-32 x 3/4-inch socket head machine screws and four #8
washers. Use a 1/8-inch hex wrench or ball driver to tighten
the screws. Make sure to use threadlock on the screws so
they don’t vibrate loose in flight.
5. Position the engine on the rails. Measure the
distance from the firewall to the front face of the drive
washer. Adjust the engine so this measurement is 4
7
/
16
-
inch (113mm). Mark the engine mount rails for the engine
mounting screws using a pencil.
6. Use a drill and 9/64-inch (3.5mm) drill bit to drill the
four holes in the engine mount rails for mounting the engine.
hint
: It is recommended to use a drill press for drilling
the holes in the engine mount rails. This will make
them nice and straight in the rails. Make sure to use
threadlock on the screws that attach the rails to the
firewall when installing the rails back on the firewall.
7. Use four 6-32 x 1-inch socket head machine screws,
four #6 washers and four 6-32 locknuts to attach the engine
to the mounting rails. Use a 5/16-inch nut driver and 7/64-
inch hex wrench or ball driver to tighten the hardware.
8. Trim the clear cowling to fit the engine. We placed the
spinner backplate on the engine crankshaft to help locate
the clear cowling while trimming. Use low-tack tape to hold
the cowling in position on the fuselage. Use a felt-tipped
pen to mark the locations for the cowl mounting screws on
the clear template. This will help when aligning the clear
template to the painted cowl.
9. Slide a silicone clevis retainer over the small nylon
clevis. Thread the clevis on the throttle pushrod and slide
the pushrod into the tube in the firewall. Connect the clevis
to the outer hole of the carburetor arm and slide the clevis
retainer over the forks of the clevis to prevent it from
opening accidentally. Bend the pushrod slightly so it does
not bind when the carburetor is opened or closed.
