Mailing List flyrotary@lancaironline.net Message #42369
From: David Staten <Dastaten@earthlink.net>
Subject: Re: [FlyRotary] Re: Uh oh, this can't be good - RD-1B PSRU woes
Date: Tue, 15 Apr 2008 11:48:17 -0500
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Tracy..
  when you say endplay, are you talking about ENGINE endplay or endplay in the PRSU assembly? On the initial assembly we never felt anything during hand rotation of prop that we didnt attribute to normal compression forces of a newly rebuilt engine. Gear lash appeared within limits and not excessively limited (at the time of assembly a long while back)

Dave

Tracy Crook wrote:
Noticed a couple more clues in the pictures.
 
 The input shaft pilot bearing appears to be stuck on the prop shaft pilot.  The overheated snubber (see instructions for part names and locations) and bearing seizure on prop shaft could be due to improper endplay (too little).  Normally not necessary but did you happen to check it during assembly?  Also, did you check the resistance of prop movement in the system lash range after assembly?   There should be very little, almost none.  If the endplay was tight enough to cause this, the resistance should be enought to feel.
 
Tracy

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