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NSI Redrive Oil Seal Leaks

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GENTRYLL(at)aol.com
Guest

Posted: Mon Oct 30, 2006 8:45 am Post subject: NSI Redrive Oil Seal Leaks

I recently read where someone in this forum vented his NSI Redrive because  it was building pressure due to heat  expansion of  the oil.  I  have a new A-40 that is doing the same thing when the transmission oil gets to  about 150 degrees.  How did you vent it so that you didn't have a  leak?

  [quote][b]

wingsdown(at)comcast.net
Guest

Posted: Mon Oct 30, 2006 9:26 am Post subject: NSI Redrive Oil Seal Leaks

Where is it leaking? Venting should not be  required. It should not be leaking. I was told by Lance that  oil mist is  created and helps lubricate and venting diminishes that to some extent.  

  

 Rick

 [quote]   

   --

MHastedt

Joined: 27 Aug 2006
Posts: 14
Location: College Station, TX

Posted: Mon Oct 30, 2006 10:59 am Post subject: NSI Redrive Oil Seal Leaks

I have a Hirth redrive on my (mostly) NSI engine and it definitely has a vent.  Originally the vent was on the middle-front face of the unit, just below the prop flange.  However, I had to move it to the top fill port position because evidently there's a low pressure zone at the original location when the prop is spinning.  It actually vacuumed out most of the redrive oil on one of the first test hops!  No problems/leaks with the vent in the top position. (I use gear oil in my redrive - does NSI?)  



-Margaret H.



 	  Quote: 	
		  >> wingsdown(at)comcast.net 10/30/2006 11:25 AM >>>

Where is it leaking? Venting should not be required. It should not be
	


leaking. I was told by Lance that  oil mist is created and helps

lubricate and venting diminishes that to some extent. 

 

Rick



--

GENTRYLL(at)aol.com
Guest

Posted: Mon Oct 30, 2006 11:28 am Post subject: NSI Redrive Oil Seal Leaks

How is the vent made?  Is it a ported plug, a tapped plug, or  what?

  [quote][b]

Fox5flyer
Guest

Posted: Mon Oct 30, 2006 1:10 pm Post subject: NSI Redrive Oil Seal Leaks

That was probably either me or Peter Graitchen.  We both vented ours,  but in different ways and with positive results.  It eliminated the  internal pressure that was causing the oil seepage.  I vented mine over 200  hours ago and it's been fine ever since.  You can see how I did it by going  to our Sportflight.com archives uploads and checking in the NSI category. or you  can just click on 

 http://www.sportflight.com/cgi-bin/uploader.pl?action=view&epoch=1058656397

 Let me know if you have any questions.

 Deke Morisse

 S5/NSI/CAP

  

 [quote]   ---

GENTRYLL(at)aol.com
Guest

Posted: Mon Oct 30, 2006 2:06 pm Post subject: NSI Redrive Oil Seal Leaks

Thanks, that looks simple enough.  I'll be trying it  shortly.

  [quote][b]

n10pg(at)neo.rr.com
Guest

Posted: Mon Oct 30, 2006 2:21 pm Post subject: NSI Redrive Oil Seal Leaks

Thats a lot of BS. All  NSI redrives, or for that matter, all gearboxes need to be vented. With heat  buildup there is a corresponding pressure buildup. With a proper overflow  container, you would be surprised how much oil is pushed out and then sucked  back in as the gearbox cools.

  

Peter Graichen

[url=http:/home.neo.rr.com/n10pg/kitfox.htm]http:/home.neo.rr.com/n10pg/kitfox.htm[/url]  



   From: owner-kitfox-list-server(at)matronics.com  [mailto:owner-kitfox-list-server(at)matronics.com] On Behalf Of  wingsdown

Sent: Monday, 30 October, 2006 12:25

To:  kitfox-list(at)matronics.com

Subject: RE: NSI Redrive Oil  Seal Leaks

 

 Where is it leaking? Venting should not be  required. It should not be leaking. I was told by Lance that  oil mist is  created and helps lubricate and venting diminishes that to some extent.  

  

 Rick

 [quote]   

    

[b]

wingsdown(at)comcast.net
Guest

Posted: Mon Oct 30, 2006 3:00 pm Post subject: NSI Redrive Oil Seal Leaks

Nice response. So where is the vent and  recovery system on standard transmission in vehicles. I will admit you did a  very nice job on the vent. I had 600 hours without a problem.

  

 Rick

 [quote]   

   --

Lynn Matteson

Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan

Posted: Mon Oct 30, 2006 4:02 pm Post subject: NSI Redrive Oil Seal Leaks

Sometimes the vent is located right on the top of the standard 

transmission casting, and sometimes the pressure goes through the front 

bearing, and is released through a shielded hole in the front bearing 

retainer (which also serves as the sleeve upon which slides the clutch 

release bearing, also known as the throw-out bearing.) If located on 

top of the casting, it is usually covered with a squeeze-on metal cap, 

to keep water and road gunk out.



Lynn

On Monday, October 30, 2006, at 06:00  PM, wingsdown wrote:



[quote] Nice response. So where is the vent and recovery system on standard 

 transmission in vehicles. I will admit you did a very nice job on the 

 vent. I had 600 hours without a problem.

  

 Rick

 --

_________________
Lynn
Kitfox IV-Jabiru 2200
N369LM

lcfitt(at)sbcglobal.net
Guest

Posted: Mon Oct 30, 2006 4:45 pm Post subject: NSI Redrive Oil Seal Leaks

I guess I shouldn't be responding here as I don't own a Sub of any variety, 

but there has been occasional talk of oil seals being pushed out by internal 

pressures.  There was talk of an oil seal retainer and talk of venting.  Has 

this from memory been a gear box issue?



Lowell

---

wingsdown(at)comcast.net
Guest

Posted: Mon Oct 30, 2006 4:56 pm Post subject: NSI Redrive Oil Seal Leaks

Lowell,



I never experienced that problem, but I believe that was the front main

engine seal. There were a few with undersize seals and some with just

too much crankcase pressure.



Rick



--

dave

Joined: 22 Sep 2006
Posts: 1382

Posted: Mon Oct 30, 2006 5:20 pm Post subject: NSI Redrive Oil Seal Leaks

Most Cars and trucks have vents on  the tranny --auto or standard as  well as transaxles and front and rear axles. 

  

 Dave 

  

  

 [quote]   ---

_________________
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GENTRYLL(at)aol.com
Guest

Posted: Mon Oct 30, 2006 5:47 pm Post subject: NSI Redrive Oil Seal Leaks

It is leaking around the front propshaft seal, but only after flying an  hour or so and the temp gets up to around 150  degrees.

  [quote][b]

smokey_bear_40220(at)yaho
Guest

Posted: Mon Oct 30, 2006 7:32 pm Post subject: NSI Redrive Oil Seal Leaks

I agree with Rick Lowell,



It was the engine front crank seal, not the GB.  Mine

drops maybe 10 drips of oil for a long flying day, but

nothing I would worry about.  Can´t even find the

source for sure, but it is somewhere at the plane´s

back of the engine (auto front).  I can´t find a wet

spot, just some oil below.



Peter G is the source for the GB vent, I believe???  I

remember it as a threaded AL extension from the fill

hole with a small plastic fuel filter on top to vent

thru.  Very nice.  Wasn´t he the one who made the dip

stick for the GB too????



I am not home again to check my memory on this, so

sorry if I got it wrong.



Kurt S.



--- wingsdown <wingsdown(at)comcast.net> wrote:

 	  Quote: 	
		   Lowell,

 

 I never experienced that problem, but I believe that

 was the front main

 engine seal. There were a few with undersize seals

 and some with just

 too much crankcase pressure.

 

 Rick


	




 

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