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Prop seals

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threein60(at)yahoo.com
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Posted: Fri Jun 16, 2006 9:43 am Post subject: Prop seals

The prop seals in my prop were replaced approx 10 hrs ago.  I assume they were installed properly and really how can you screw it up!  But I still have evidence that oil is leaking from the front hub of the prop.  has anyone had experience with the oil tube gasket leaking and causing oil thru the skull cap or does this type of leak only show at the rear of the prop.  Question 2...  Can these oil tube seals be had easily or are they made in such a way that I can fabricate one?

   

  Thanks

  Larry

   

Larry Pine



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dsavarese(at)elmore.rr.co
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Posted: Fri Jun 16, 2006 9:55 am Post subject: Prop seals

Did you check for scoring on the hub piston sleeve?  Even  a new outer seal will not seal perfectly if there is scoring on the piston  sleeve which the rubber gasket presses against.  Carefully examine the  outer seal edge for nicks etc.  An oil tube gasket leak will typically show  up around the prop flange sawtooth.  Look inside the hub for  oil.  It can come from the oil tube gasket or from the inner seal on the  hub piston.  The oil tube gasket should be available from either Doug Sapp,  Carl Hays or Gesoco/Cliff or George Coy.  Not worth trying to  fabricate.

 Dennis

  

 [quote]   ---

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rvfltd(at)televar.com
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Posted: Fri Jun 16, 2006 10:12 am Post subject: Prop seals

Larry,

 Check  the dome for out of round or scoring.  I cannot repeat the tolerances but  it is listed in the Airframe Accessory Overhaul Manual.  Check the oil  transfer tube for pitting or rust.  They are hard to find but I have heard  of guys having them hard chromed and polished if they are found to be pitted or  scratched.

  

 Hope  this helps

  

 

Always Yakin,

Doug Sapp   [quote]   --

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cpayne(at)joimail.com
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Posted: Fri Jun 16, 2006 11:31 am Post subject: Prop seals

Sounds like the gasket(s) under the oil tube, where it screws into the crankshaft end. Make sure the tube isn't loose to start with. An O-ring will work and you could make a couple of flat ones from good gasket material if you have a sharp die cutter of the right size. Oil hole cannot be blocked though. Worked for me.

  

  

 Craig Payne

 cpayne(at)joimail.com (cpayne(at)joimail.com)

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HawkerPilot2015

Joined: 10 Jan 2006
Posts: 503

Posted: Fri Jun 16, 2006 9:26 pm Post subject: Re: Prop seals

I had the same problem and there were two issues:



1.) The prop shaft was loose. 



2.) The seals were old.



I bought new ones from Doug Sapp and they did the trick.

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