Jabiru J450 Constructors Manual
Post-Paint>Fuselage>Firewall forward>Fit propeller and spinner
Tuesday, April 6, 2010
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Pre-fit the spinner
Test fit the spinner – it can be fitted in 2 positions, so try it each way and use the position
where the holes all line up the best while giving an even gap around the base of the propeller.
When the mounting position has been decided, mark each component with a permanent
marker as shown above so that if there is any need to remove the spinner or propeller all the
parts can be refitted in the same position relative to each other.
Fit the spinner in place and line it up with the back of the rear mounting plate and then push a
5/32” pop rivet though all of the holes that line up. Working on one remaining hole at a time,
drill a 5/32” hole through the spinner and the rear mounting plate and temporarily place a
5/32” pop rivet in each hole to keep the spinner and the mounting plate in alignment.
Work your way around all 6 holes in this manner. Repeat the process for the 6 holes in the
front mounting plate. The spinner should resemble a porcupine at this stage, with pop rivets
protruding from the 12 mounting holes. Remove the pop rivets and the spinner and drill all the
holes in the spinner out to 3/16” to provide clearance for the screw threads.
Countersink each hole so that the Tinneman washers will sit flush against the spinner.
Fit the captive nuts to the inside of the spinner mounting plates - use the captive nut itself
(a complete captive nut assembly is shown below left) as a jig (below right) to drill the rivet
holes– thread the screw part way through the captive nut from the back and fit the exposed
end of the thread into the hole, then drill the 2 x 3/32” rivet holes.
Countersink the rivet holes just enough to make a countersunk 3/32” rivet sit flush and fix the
captive nuts in place and then enlarge the 5/32” holes in the mounting plates to 3/16” to
provide clearance for the screw threads.