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Oil leakage.

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crobin(at)skyvantage.com
Guest

Posted: Mon Jul 01, 2013 8:42 am Post subject: Oil leakage.

I have a difficult to locate oil leak somewhere that is giving the belly of the beast a nice lube job.

Anyone have any tips or 'easy button' I can press to help me locate this spitter?Â Â  Top ten locations of leaks? 

  



Cory Robin



'WilgaBeast'[url=http://www.facebook.com/skyvantage][/url]

 

  [quote][b]

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mark.bitterlich(at)navy.m
Guest

Posted: Mon Jul 01, 2013 9:29 am Post subject: Oil leakage.

What I normally do is to remove top and lower cowls, get ALL the oil off the engine and firewall, start it up and have a guy with a ladder behind the prop to very carefully inspect the engine when it is running.  Yes, it is dangerous.. but..... 



I recently had an oil leak that for all the world looked like it was the rear supercharger seal.  I was crushed.  That seal can only be replaced by yanking the engine and taking a lot of stuff apart.  



Guess what?  Turns out it was the freaking lower GENERATOR adapter plate that was leaking.  Why?  Because even with the standard "bend up and lock" Russian nut locks, all four nuts had come loose on the generator studs, allowing the oil to leak out of the lower generator adapter plate.  I replaced the seals, and put the nuts back on the studs with split ring lock wasters and also thread sealer and am keeping a close eye on them.  Thinking about drilling some nuts so I can safety wire those suckers.  



Otherwise normal oil leaks are from the valve rocker covers, the valve rocker shaft crush washers, etc.  



Bottom line, the only way I've ever found to find the leaks is to have the engine totally clean and then run it on the desk with a guy that has good eyes looking at it.  Oil leaks can be insidious.    



Mark

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jimmy(at)pfmengineering.c
Guest

Posted: Mon Jul 01, 2013 9:52 am Post subject: Oil leakage.

I have a leaky oil tank drain valve that initially only leaked when the oil 

was hot.  It took a while to find the source of all the oil on the aircraft 

belly.  I have a replace valve, but have not found a way to remove the old 

valve without removing the tank.



Jim



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mark.bitterlich(at)navy.m
Guest

Posted: Mon Jul 01, 2013 10:02 am Post subject: Oil leakage.

Good one!  I forgot about that source!  Another one is the sump drain on the nose of the engine.  That can leak too.  



Mark

p.s.  Actually, it's hard to name all the possible sources ... 

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crobin(at)skyvantage.com
Guest

Posted: Mon Jul 01, 2013 11:56 am Post subject: Oil leakage.

Thank you everyone!Â  This is very helpful as tomorrow it's looking to be sporty hot in Salt Lake City tomorrow as I troubleshoot this.Â  And hope to nail things down!Â Â  Any other suggestions are welcome!

  

  [quote][b]

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keithmckinley

Joined: 11 Aug 2008
Posts: 434

Posted: Mon Jul 01, 2013 2:44 pm Post subject: Re: Oil leakage.

I don't know what aircraft you are speaking of but if it has a vent line in the oil tank like the CJ, any time the aircraft is less than 1G a little oil gets in that vent tube a coats the belly when the G comes back on. Until I put an air/oil separator on my CJ  you can't imagine how much a tiny amount of oil seems to look like quarts when is gets on the belly.



K

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viperdoc(at)mindspring.co
Guest

Posted: Mon Jul 01, 2013 5:38 pm Post subject: Oil leakage.

Back seal on sump 

Seal on base of tach drive

Sump drain

Super charger seal

Nose case seal

Seals on push rod tubes

Cylinder base O ring

Valve cover seal

Push rod tube at rocker box

Every dead gummed seal on the accessory case

Every danged one of the oil line fittings

To name a few places I have seen. 

Permabond anaerobic gasket sealant works great on those pesky flawed seals. Nice part is it comes apart with a little pressure and a few taps on the case with a rubber sand hammer.

Doc

Sent from my iPad



On Jul 1, 2013, at 2:52 PM, Cory Robin <crobin(at)skyvantage.com (crobin(at)skyvantage.com)> wrote:

[quote]Thank you everyone!  This is very helpful as tomorrow it's looking to be sporty hot in Salt Lake City tomorrow as I troubleshoot this.  And hope to nail things down!   Any other suggestions are welcome!

  

   	  Quote: 	
		  



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crobin(at)skyvantage.com
Guest

Posted: Wed Jul 03, 2013 1:13 pm Post subject: Oil leakage.

Turns out, the leak (or at least the one we found) was simply a fitting on the oil cooler....Â Â  Nothing major.Â Â Â  

We'll fly it a bit and see if there's anything else.

  Thank you everyone for giving me great spots to look at!Â Â  Looks squeaky clean - for the moment!



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