Years ago, I used to pull every third pin, then tap the hole with a
1/4-28
> thread all the way down. Insert a grade 8 long set screw with red
> locktite,
> and stake the top to prevent it from backing out. This is how we
locked
> the
> rotor gear from walking out of the rotor without having it snap
ringed. I
> was just too cheap to give my money to racing beat back then, and
didn't
> have my own machine shop to cut snap ring grooves!
> We don't turn enough rpm to need this on the aircraft engines,
but fun to
> look in the rotors at the meat available for mods.
> Larry
I for another would like to know how this roll pin is pulled. I seriously
doubt that the spring steel pin could be tapped. It's probably as hard as the tap.
Robert
You pull the gear or press it out from the other side. It is just held in with
friction. Some of the roll pins may come out with the gear.
That leaves a part of the roll pin sticking out. Grab them with vise grips. If that
does not work you now have room to tack weld on a short pcs. of welding rod and use that
to pull them out.
--
Paul Lamar ...No rotor no motor. >
If the engine has overheated the oil at full power, it is common for the
gear to walk out of the rotor and touch the iron. This rotor may
continue to function normally for years. The springs behind the side
seals and corner seals tend to keep the rotor centered with no faces
touching any irons. It is common to reduce these faces
a few thousandths when very high RPMs are used.
So, if you plan to machine on the rotors or before assembly, put the
rotor in a press between aluminum plates and give the gear a good push
into the rotor. Then you know its as deep as it can go, and no machining
swarf can get under the gear. If you keep the oil temps and RPM under
control, the gear walking out will never be a problem.
I was never able to get the roll pins out. Pushing the gear all the way
out never occurred to me.....DUH.
But there is room for a couple of 10-32 screws intersecting the gear and
rotor. Use a real short drill and go slow.
Lynn E. Hanover
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