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Compressor Issues

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HawkerPilot2015

Joined: 10 Jan 2006
Posts: 503

Posted: Fri Oct 06, 2006 5:00 am Post subject: Compressor Issues

So I take off and am flying along when I do an instrument check and my primary pressure is not moving. Not going down and certainly not going up! I turn around, head back to the airport and land without incident. Taxing in I am using air that is not being replenished. 



Pull the "output" line off the snot valve, have a brave mechanic put his finger over the port and crank the engine....nothing! So, I have a compressor that is Tango Uniform. 



I have been told that the coupling could be inop and could replace just that instead of the whole pump. I am in need of either.......sources??



Thanks in advance.

ReadeG(at)Cairnwood.com
Guest

Posted: Fri Oct 06, 2006 5:23 am Post subject: Compressor Issues

Tim:



Take the filter off the top of the compressor and while pulling prop through

determine if valve at the top of the compressor is moving - if it is then

you can replace the "top" or compressor alone.  If the there is no movement

of the piston then you've probably sheared the drive coupling and have to

replace the right angle drive assembly.  



I've done both - the former is a little easier, the latter requires lots of

patience and Gumby like agility with offset angle wrench.  You have to

remove a bunch of stuff to get decent access - 



Call me for the details if you want -



Reade



215.914.0370 



[quote] --

dsavarese(at)elmore.rr.co
Guest

Posted: Fri Oct 06, 2006 5:34 am Post subject: Compressor Issues

Tim,

Before you pull the compressor, remove the output check valve from the 

compressor, clean it thoroughly and make sure the little "valve" is able to 

move with the spring pressure.  If the output check valve is carboned up and 

the little valve is stuck, then you may have sheared the shear coupling. 

Reinstall and test again for output.  Did you check the line going into the 

"snot" bottle for air from the compressor or did you check the output of the 

snot bottle?  I have seen the snot bottle so blocked up that it would not 

allow the air to pass through it.  It's not  bad idea to pull the snot 

bottle and flush it out every year or two.

Dennis



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HawkerPilot2015

Joined: 10 Jan 2006
Posts: 503

Posted: Fri Oct 06, 2006 4:33 pm Post subject: Re: Compressor Issues

Dennis,



I have done what you suggested and think it is a no $hit compressor issue. I did get some gunk cleaned out of the check valve and snot valve. 



Reade, I may indeed call you for some suggestions. I looked at who to get that thing off and if I were six inches tall with 11mm hands, I would be golden..but.....



If all else fails, I will take my .40 cal with me to the airport. 



Anyone know of a source for parts for these things or is it recommended to get the whole thing overhauled? The airplane is 22 years old and has had a rough life...until now. I want this to be done right.

dsavarese(at)elmore.rr.co
Guest

Posted: Sat Oct 07, 2006 3:55 am Post subject: Compressor Issues

Tim,

I'm not sure if Carl/Jill can overhaul your compressor.  But it certainly 

wouldn't hurt to ask.  I believe Doug Sapp, Carl/Jill may have them in stock 

as well as Steve Culp of Culps Specialties in Shreveport, LA.  Steve 

advertises on Ebay with a lot of M14 parts including compressors.   Steve 

may also have the shear couplings in stock.

Dennis



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HawkerPilot2015

Joined: 10 Jan 2006
Posts: 503

Posted: Sat Oct 07, 2006 11:29 am Post subject: Re: Compressor Issues

This thing is a mofo to get off. I will have to slam the Russians for this one. A bitch of a part surrounded by a fine airplane.



I have three nuts off and feel like I have been kicked in mine. I have to step away and took another look at this.....

viperdoc(at)mindspring.co
Guest

Posted: Sat Oct 07, 2006 3:14 pm Post subject: Compressor Issues

Hope you have the Russian tool kit or your gonna some really bad names and

that is not going to help either. Dennis has done that I count 3 or is it 4

times now. 

Doc

 	  Quote: 	
		   [Original Message]

 From: Tim Gagnon <NiftyYak50(at)msn.com>

 To: <yak-list(at)matronics.com>

 Date: 10/7/2006 2:37:05 PM

 Subject: Re: Compressor Issues



 



 This thing is a mofo to get off. I will have to slam the Russians for

this one. A bitch of a part surrounded by a fine airplane.
	


 	  Quote: 	
		  

 I have three nuts off and feel like I have been kicked in mine. I have to

step away and took another look at this.....
	


 	  Quote: 	
		  



 Read this topic online here:



 http://forums.matronics.com/viewtopic.php?p=66408#66408

dsavarese(at)elmore.rr.co
Guest

Posted: Sat Oct 07, 2006 4:21 pm Post subject: Compressor Issues

More than that Doc.

Dennis



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dsavarese(at)elmore.rr.co
Guest

Posted: Sat Oct 07, 2006 4:30 pm Post subject: Compressor Issues

Personally, I think it's the worse job in the engine compartment.

Dennis



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HawkerPilot2015

Joined: 10 Jan 2006
Posts: 503

Posted: Sat Oct 07, 2006 4:33 pm Post subject: Re: Compressor Issues

 	  dsavarese(at)elmore.rr.co wrote: 	
		  More than that Doc.

Dennis



--- 	




I am all ears....and busted knuckles.



Any advice....what other items to take off to make it easier, methods of removal...stuff like that. Or you could always come up and I could learn from the master!  A cold beer awaits....

mark.bitterlich(at)navy.m
Guest

Posted: Wed Oct 11, 2006 1:51 pm Post subject: Compressor Issues

Think so?  Pull the starting air distributor off, and then try to put it

back on and get it to work again. 



Mark



--

mark.bitterlich(at)navy.m
Guest

Posted: Wed Oct 11, 2006 2:02 pm Post subject: Compressor Issues

By this time, I guess you have for sure determined that it is indeed

the compressor that is bad.  Normally, it is either the banjo fitting

leaking, or the line going from the compressor banjo fitting to the snot

valve itself that has failed.  



The best method to determine this is to remove the line from the snot

valve and reverse pressurize the line from some high pressure source.

You can then hear where the leak is coming from and fix it.  



9 times out of 10, it is NOT the compressor.....



Mark Bitterlich

N50YK



--

dsavarese(at)elmore.rr.co
Guest

Posted: Wed Oct 11, 2006 6:15 pm Post subject: Compressor Issues

You're right Mark.  You win!

Dennis



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