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Prop seals

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CJcanuck

Joined: 05 Jul 2006
Posts: 39

Posted: Wed Oct 17, 2007 3:50 am Post subject: Prop seals

Hi All!



Lately I've noticed an increase in the amount of oil seeping out of the prop hub and down the prop blades after each flight.  I've also started to see some splatter on the wings (mainly the left) and the windscreen.  My AME feels it's due to the prop seals 'drying out' due to insufficient flying.



We are planning on pulling the prop anyways come annual time, but I was wondering if anyone has any other ideas, or ways of keeping the prop seals in good condition during periods of inactivity.



FYI, the prop came from China with zero-time, though from the look of the paint on the blades it's not a new prop unit, just overhauled.



Thanks!

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cjpilot710(at)aol.com
Guest

Posted: Wed Oct 17, 2007 4:41 am Post subject: Prop seals

In a message dated 10/17/2007 7:52:38 A.M. Eastern Daylight Time,  m_kirk69(at)hotmail.com writes:

  

 First of all fly more often.

  

 Second, the prop seals are easily changed.  Just make sure you put  them in the correct way.  Make sure there are no scratches.  Smooth  them out with very fine emery paper.

  

 Third, I don't think the seal "dry out" really.  Because they are not  moving and stationary for a long time, they tend to take a "set" to one  side which allows oil to by pass.  Even if you don't fly, Just running the  engine and cycling the prop a number of times, several time a month, help keep  that from happening.

  

 Jim "Pappy" Goolsby

  

  

  

  

  	  Quote: 	
		  Hi    All!



Lately I've noticed an increase in the amount of oil seeping out    of the prop hub and down the prop blades after each flight.  I've also    started to see some splatter on the wings (mainly the left) and the    windscreen.  My AME feels it's due to the prop seals 'drying out' due to    insufficient flying.



We are planning on pulling the prop anyways come    annual time, but I was wondering if anyone has any other ideas, or ways of    keeping the prop seals in good condition during periods of    inactivity.



FYI, the prop came from China with zero-time, though from    the look of the paint on the blades it's not a new prop unit, just    overhauled.



Thanks!



	




  [quote][b]

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rvfltd(at)televar.com
Guest

Posted: Wed Oct 17, 2007 5:33 am Post subject: Prop seals

One thing to keep in mind, the Chinese do not "overhaul" as we here in the US do, they I.R.A.N.  If your prop seals looked good to the fellow doing the work at the "overhaul" shop he may not have thought it was necessary to replace them.  

 

 Inspect, Repair, As Necessary.  

 

 We all need to understand what "overhaul" means in the various countries.  

 

 Always Yakin,

 Doug

 

 

 cjpilot710(at)aol.com (cjpilot710(at)aol.com) wrote:

 [quote]            In a message dated 10/17/2007 7:52:38 A.M. Eastern Daylight Time, m_kirk69(at)hotmail.com (m_kirk69(at)hotmail.com) writes:

    

   First of all fly more often.

    

   Second, the prop seals are easily changed.  Just make sure you put them in the correct way.  Make sure there are no scratches.  Smooth them out with very fine emery paper.

    

   Third, I don't think the seal "dry out" really.  Because they are not moving and stationary for a long time, they tend to take a "set" to one side which allows oil to by pass.  Even if you don't fly, Just running the engine and cycling the prop a number of times, several time a month, help keep that from happening.

    

   Jim "Pappy" Goolsby

    

    

    

    

    	  Quote: 	
		  Hi All!

     

 Lately I've noticed an increase in the amount of oil seeping out of the prop hub and down the prop blades after each flight.  I've also started to see some splatter on the wings (mainly the left) and the windscreen.  My AME feels it's due to the prop seals 'drying out' due to insufficient flying.

     

 We are planning on pulling the prop anyways come annual time, but I was wondering if anyone has any other ideas, or ways of keeping the prop seals in good condition during periods of inactivity.

     

 FYI, the prop came from China with zero-time, though from the look of the paint on the blades it's not a new prop unit, just overhauled.

     

 Thanks!

     

     	
   

   

   

      

    	  Quote: 	
		  

	
 [b]

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wlannon(at)persona.ca
Guest

Posted: Wed Oct 17, 2007 8:14 am Post subject: Prop seals

The seals are the "chevron" type and tend to lose their set over time. The 

Chinese ones seem particularly poor in this regard. The Russian ones may be 

better.



The oil leakage you see coming from the hub is in fact coming through the 

hub from the pitch change unit. The hub is lubricated by grease and has 

blade seals intended to retain the grease. They do not work too well with 

oil.



You need to replace the two seals on the pitch change piston. Doug Sapp will 

have new ones.



Walt



---

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mark.bitterlich(at)navy.m
Guest

Posted: Wed Oct 17, 2007 3:08 pm Post subject: Prop seals

Let me add something to what Walt said if I may.  If you have oil

leakage coming out of the prop seals it can also come from a leaking

seal where the oil feed tube is screwed down to the front of the engine.

There is a gasket under where that tube screws down that you can

sometimes get to stop leaking simply by applying more torque to the tube

"nut" (per se). If that fails, you need to replace the gasket.  



Doug, do you have these as well?  I need one myself!  



Mark Bitterlich

N50YK



 



--

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rvfltd(at)televar.com
Guest

Posted: Wed Oct 17, 2007 4:49 pm Post subject: Prop seals

Mark,

 Yep sure do, it's part number G1-0017, item #3 on page 125 of vol 2 of the CJ IPBs.   It fits just under the oil transfer tube (on your 50 it's called a "tube nut" I guess) ;o)  Contact me off list and I get one coming your way.  

 

 A note to others, recently I have seen no less than three props which someone had substituted a rubber 0 ring in place of this alu crush seal.  This is a huge No No, on one engine "most" of the 0 ring was found, on the other only a very small piece.  You just gotta wonder............

 

 Always Yakin,

 Doug 

 

 Bitterlich, Mark G CIV Det Cherry Point, MALS-14 64E wrote:

 [quote]   [quote]--> Yak-List message posted by: "Bitterlich, Mark G CIV Det Cherry Point, MALS-14 64E" <mark.bitterlich(at)navy.mil> (mark.bitterlich(at)navy.mil)  Let me add something to what Walt said if I may.  If you have oil leakage coming out of the prop seals it can also come from a leaking seal where the oil feed tube is screwed down to the front of the engine. There is a gasket under where that tube screws down that you can sometimes get to stop leaking simply by applying more torque to the tube "nut" (per se). If that fails, you need to replace the gasket.    Doug, do you have these as well?  I need one myself!    Mark Bitterlich N50YK     --

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