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prop still leaking after hub seals changed?

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skidmk

Joined: 19 Nov 2007
Posts: 171
Location: Ottawa, Ontario

Posted: Mon Apr 05, 2010 8:19 am Post subject: prop still leaking after hub seals changed?

first couple of hours it was fine, then a little weeping... now quite a bit of oil on the vanes.



any ideas?



M

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_________________
Mike "Skidmk" Bourget
Ottawa, Ontario

mark.bitterlich(at)navy.m
Guest

Posted: Mon Apr 05, 2010 8:37 am Post subject: prop still leaking after hub seals changed?

I think you have an M-14 with a two blade V-530 hub correct?  If so... 



Depends on exactly what you mean by hub seals.  The ones on the prop

blades are there to keep the grease in.  If there is OIL coming out of

THOSE prop blade flanges, it is not a bad Hub Blade seal that is the

problem.  It's one of the OTHER ones.  



If we are talking OIL, there are usually three areas of concern. 



1.  The large and small o'ring seals for the hub piston (you take the

front hub cover off to get at these)

2.  The oil control tube crush washer.  This is the PIPE that screws

into the front of the engine that the oil goes through to get to the hub

and control the prop.  This has a crush washer on the front that leaks

and ends up coming out the prop area. 

3.  The shaft seal on the reduction gearbox...that is NOT easy to

change, but does not usually go bad unless you're doing serious acro. 



You're going to have to determine exactly where the oil is coming from.

That has been my experience... Others better versed probably have more

accurate advice.  I am by no means a prop expert.  



Mark Bitterlich 

 



 



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dsavarese0812(at)bellsout
Guest

Posted: Mon Apr 05, 2010 9:32 am Post subject: prop still leaking after hub seals changed?

Remove the prop dome and piston assembly.  If there is  oil inside the hub, the inner seal on the piston is bad (possibly incorrectly  installed too) OR the seal behind the oil tube is bad or the tube is not  fully tightened.  Most likely it's the inner seal on the piston if  there is oil pooling inside the hub.  If the piston outer seal is  leaking, there will be oil on the inside of the "skull cap" dome.  As Mark  says, check the front seal on the nose case to see if there is evidence of oil  around the prop hub/flange shaft.

 Dennis

  

 [quote]   ---

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William Halverson

Joined: 27 Feb 2010
Posts: 88

Posted: Mon Apr 05, 2010 10:41 am Post subject: prop still leaking after hub seals changed?

When you day 'fully tightened' do you use a torque wrench?



Thanks!





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yakplt(at)yahoo.com
Guest

Posted: Mon Apr 05, 2010 2:22 pm Post subject: prop still leaking after hub seals changed?

Thanks for saying it better than I could Dennis.  I am a half-ass mech.  

  

 Mark

 



--- On Mon, 4/5/10, A. Dennis Savarese <dsavarese0812(at)bellsouth.net> wrote:



 [quote]

From: A. Dennis Savarese <dsavarese0812(at)bellsouth.net>

Subject: Re: prop still leaking after hub seals changed?

To: yak-list(at)matronics.com

Date: Monday, April 5, 2010, 1:27 PM



    Remove the prop dome and piston assembly.  If there is oil inside the hub, the inner seal on the piston is bad (possibly incorrectly installed too) OR the seal behind the oil tube is bad or the tube is not fully tightened.  Most likely it's the inner seal on the piston if there is oil pooling inside the hub.  If the piston outer seal is leaking, there will be oil on the inside of the "skull cap" dome.  As Mark says, check the front seal on the nose case to see if there is evidence of oil around the prop hub/flange shaft.

 Dennis

  

 [quote] ---

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dsavarese0812(at)bellsout
Guest

Posted: Mon Apr 05, 2010 3:52 pm Post subject: prop still leaking after hub seals changed?

I seriously doubt that Mark.  -

 Dennis

 [quote]   ---

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viperdoc(at)mindspring.co
Guest

Posted: Mon Apr 05, 2010 5:19 pm Post subject: prop still leaking after hub seals changed?

But one hell of a sparkvark!  

Doc  

     

From: owner-yak-list-server(at)matronics.com [mailto:owner-yak-list-server(at)matronics.com] On Behalf Of Yak Pilot

 Sent: Monday, April 05, 2010 5:19 PM

 To: yak-list(at)matronics.com

 Subject: Re: prop still leaking after hub seals changed?  

  

              

Thanks for saying it better than I could Dennis.  I   am a half-ass mech.     

      

    

      

Mark   

      



   

   --- On Mon, 4/5/10, A. Dennis Savarese <dsavarese0812(at)bellsouth.net>   wrote:   

   [quote]   



   From: A. Dennis Savarese <dsavarese0812(at)bellsouth.net>

   Subject: Re: prop still leaking after hub seals changed?

   To: yak-list(at)matronics.com

   Date: Monday, April 5, 2010, 1:27 PM         

Remove the prop dome and   piston assembly.  If there is oil inside the hub, the inner seal on the   piston is bad (possibly incorrectly installed too) OR the seal behind   the oil tube is bad or the tube is not fully tightened.  Most likely it's the   inner seal on the piston if there is oil pooling inside the hub.  If the   piston outer seal is leaking, there will be oil on the inside of the   "skull cap" dome.  As Mark says, check the front seal on the   nose case to see if there is evidence of oil around the prop hub/flange   shaft.   

      

Dennis   

      

    

   [quote]      

-----   Original Message -----    

      

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

      

To: yak-list(at)matronics.com    

      

Sent: Monday, April 05,   2010 11:36 AM   

      

Subject: RE: prop   still leaking after hub seals changed?   

      

    

   

--> Yak-List message   posted by: "Bitterlich, Mark G CIV Det Cherry Point, MALS-14 64E" <mark.bitterlich(at)navy.mil>

   

   I think you have an M-14 with a two blade V-530 hub correct?  If so... 

   

   Depends on exactly what you mean by hub seals.  The ones on the prop

   blades are there to keep the grease in.  If there is OIL coming out of

   THOSE prop blade flanges, it is not a bad Hub Blade seal that is the

   problem.  It's one of the OTHER ones.  

   

   If we are talking OIL, there are usually three areas of concern. 

   

   1.  The large and small o'ring seals for the hub piston (you take the

   front hub cover off to get at these)

   2.  The oil control tube crush washer.  This is the PIPE that   screws

   into the front of the engine that the oil goes through to get to the hub

   and control the prop.  This has a crush washer on the front that leaks

   and ends up coming out the prop area. 

   3.  The shaft seal on the reduction gearbox...that is NOT easy to

   change, but does not usually go bad unless you're doing serious acro. 

   

   You're going to have to determine exactly where the oil is coming from.

   

   

   That has been my experience... Others better versed probably have more

   accurate advice.  I am by no means a prop expert.  

   

   Mark Bitterlich 

    

   

    

   

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mark.bitterlich(at)navy.m
Guest

Posted: Tue Apr 06, 2010 3:31 pm Post subject: prop still leaking after hub seals changed?

Only thing in life that I can hold my own in. 



Thanks, 



Mark

 



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dsavarese0812(at)bellsout
Guest

Posted: Wed Apr 07, 2010 3:29 am Post subject: prop still leaking after hub seals changed?

No question about THAT!

 Dennis

 [quote]   ---

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