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Subject: RE: [FlyRotary] RD1-C install
Date: Wed, 21 Jun 2006 15:39:05 -0500
Message-ID: <87DBA06C9A5CB84B80439BA09D86E69E04E8107D@MAIL01.austin.utexas.edu>
In-Reply-To: <list-1200867@logan.com>
Thread-Topic: [FlyRotary] RD1-C install
Thread-Index: AcaVa3VK7QJ4u3QiQhehgU1Q0+lLQQABdJ0Q
From: "Mark R Steitle" <mark.steitle@austin.utexas.edu>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>

Bill,
Since you did a dry assembly with no problems, I can only guess that
your assembly problem is do to the grease.  I would like to mention
something about the grease in the pilot bearing.  You can remove a
stubborn pilot bearing by filling the void with grease and driving an
old pilot shaft into the hole.  The grease will act like a hydraulic
ram, removing the bearing.  You didn't mention how much grease you put
in the bearing hole, but if you put too much grease in the pilot hole,
then the pilot shaft wouldn't have room to fit completely into the hole.
That could be the cause of your assembly problems.

Also, if the shaft is a close fit, a little grease on the pilot shaft
and/or on the pilot bearing could make an airtight seal and create a
pressurized air pocket down in the hole.  This could also cause assembly
problems. =20

This may sound overly simplistic but I think you only want a very thin
film of grease on the pilot shaft as it turns at the same speed as the
crankshaft and therefore only needs grease to keep it from rusting and
freezing in the hole. =20

Mark S.


-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of Bill Bradburry
Sent: Wednesday, June 21, 2006 2:46 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] RD1-C install

There are still a few days till Tracy returns, so perhaps some of you
who have already gone down this path can assist me.
I am in the midst of installing the RD1-C drive and have aready made one
screwup.  I assembled the drive to determine fit and everything was ok,
so I removed it and started the final reinstall with sealant, grease,
etc.  With grease on the pilot bearing, air traps behind it and when I
push it in and release, it comes back out.  So I decided to use the 12
bolts to pull it in.  With grease on the thrust bearing, it stuck to the
adapter plate and was pulled off its location on the input shaft.  It
then slid down and was trapped (pinched) by the input shaft when I tried
to pull it in with the quarter inch bolts.  Crushed one of the
bearings!!  :>(  This happened just after Tracy left for vacation, so I
have had some time to think about what I did wrong...Not much joy!  I
plan to not put grease on the adapter plate side of the bearing this
time.
What can any of you suggest to me?  I would hate to go thru this again!
BTW...This is just at the location in Tracy's instructions where he says
not to force anything...I now have total understanding about why!

Also,  Tracy suggests that we put everything together and rotate the
assembly to center it, then torque the bolts that hold the damper to the
flywheel.  I can barely get any kind of wrench on the bolts, let alone a
torque wrench!  How did you guys accomplish this task?
Thanks for the help!

Bill Bradburry


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