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Compressor issue

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jan.mevis(at)informavia.b
Guest

Posted: Tue Jan 18, 2011 12:35 am Post subject: Compressor issue

What happens  is that the shear pin of the compressor breaks. I’ve seen this a couple of times. 

Could also be the pipe from the compressor to the water separator: they usually crack at one of the ends. I’d run the engine and use soapy water for that. By moving the prop manually you won’t build up a lot of pressure. The compressor is a two-stages pump.

 

BR,

 

Jan 

 

 

 

 

 

From: owner-m14pengines-list-server(at)matronics.com [mailto:owner-m14pengines-list-server(at)matronics.com] On Behalf Of Didier Blouzard

Sent: dinsdag 18 januari 2011 9:05

To: m14pengines-list(at)matronics.com; Dominique Lucas

Subject: Compressor issue



 

Hi Yak friends,



My friend have a problem with the air in his 52. His air bottle does not refill.

We tested yesterday part of the system and here are some symptoms.

First the air bottle when closed does not leak.

When opened no leak heard also and all is working properly. Gear brakes flaps.

Only visible symptom is that the pressure doesn't rise. After landing when opening the water collector, no air is coming out.



We tryed all the following by turning the prop by hands :



I put my hand on the compressor filter and can feel the air going in.

So we unmounted the pipe coming from the compressor to the water collector in order to see if air is coming out. Putting my thumb on the pipe with soap water, I barely could feel anything coming out...

I blowed into the water collector and air is passing thrue.



Any hints regarding these symptoms please guys???



-- 

Didier BLOUZARD

didier.blouzard(at)gmail.com (didier.blouzard(at)gmail.com)

0624243672 	  Quote: 	
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dsavarese0812(at)bellsout
Guest

Posted: Tue Jan 18, 2011 4:42 am Post subject: Compressor issue

Hi Didier,

There are 2 things that will cause the symptom you have defined.

- The compressor has a coupling between it and the

accessory case.  This coupling has 3 shear pins which if sheared, stops 

the compressor from functioning when the engine is in operation. 

Unfortunately, to gain access to the shear coupling the compressor has 

to be removed from the accessory case.  There are six 11 mm nuts around 

the base of the compressor where it mounts to the accessory case.  In 

the Russian tool box is a long T-handle tool with a curve toward the end 

with an 11 mm box end wrench.  Its sole purpose in life is to remove the 

nuts on the compressor.  Most likely you will be making a few tools to 

reinstall the nuts. I am certain you will use a lot of foul language 

removing and reinstalling the nuts because they are quite difficult to 

get to.  Remove everything in front of the compressor, including the 

exhaust section for ease of access to the base of the compressor.



- Secondly, (and the first thing I would try) remove the output check 

valve from the compressor.  This is the valve where the line coming from 

the water separator bottle that has the banjo fitting on the end, 

attaches to the compressor.  The nut size I believe is 22 mm.  When you 

remove the output check valve, look at the flat surface.  In the center 

you will see a small circle about the size of a pencil eraser.  Push the 

circle down.  If it doesn't move, the output check valve in carboned up. 

  Disassemble the sections of the output check valve and clean.  The 

little circle I mentioned is actually a little "valve" that is held in 

place by a small spring which is inside the output check valve.  You 

will need a new set of crush washers when you reassemble.



Once you remove the output check valve, put your thumb or finger on the 

hole and have someone rotate the prop.  See if you feel output pressure 

from the compressor.  If not, go back to removing the compressor to 

replace the shear coupling.

Hope this helps.

Dennis



A. Dennis Savarese

334-285-6263

334-546-8182 (cell)

Skype: Yakguy1

www.yak-52.com



On 1/18/2011 2:04 AM, Didier Blouzard wrote:

 	  Quote: 	
		   Hi Yak friends,



 My friend have a problem with the air in his 52. His air bottle does not

 refill.

 We tested yesterday part of the system and here are some symptoms.

 First the air bottle when closed does not leak.

 When opened no leak heard also and all is working properly. Gear brakes

 flaps.

 Only visible symptom is that the pressure doesn't rise. After landing

 when opening the water collector, no air is coming out.



 We tryed all the following by turning the prop by hands :



 I put my hand on the compressor filter and can feel the air going in.

 So we unmounted the pipe coming from the compressor to the water

 collector in order to see if air is coming out. Putting my thumb on the

 pipe with soap water, I barely could feel anything coming out...

 I blowed into the water collector and air is passing thrue.

 Any hints regarding these symptoms please guys???



 --

 Didier BLOUZARD

 didier.blouzard(at)gmail.com <mailto:didier.blouzard(at)gmail.com>

 0624243672



 *

 *

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mark.bitterlich(at)navy.m
Guest

Posted: Tue Jan 18, 2011 8:36 am Post subject: Compressor issue

Everyone has a different way of doing things, my suggestion is based on

having the right tools in hand and .... being basically lazy.  Having

had a lot of leaks to deal with on Russian aircraft, I developed this

procedure.  Admittedly, without the right tools and fittings, it is not

easy to do.  I obtained the tools, I made the fittings.  They have been

a life-saver over time.  



My suggestion is to obtain a regulated air source that can input 700 PSI

or so.  This can be difficult, but I happen to have one.  Next, take the

line off the snot valve that feeds back to the engine compressor.

Connect your air source to that line.  Pressurize that line.  Yes, you

are putting the air in "backwards" so to speak.  Listen for leaks.  As

has already been mentioned, this line fails....a LOT.  Also, it is very

common for leaks to occur at the check valve and banjo fitting area

located at the compressor.  



Then.... hook your pressure line to the snot valve, and once again

pressurize the system.  Listen for leaks.  Soapy water, etc. 



You can do all this in a hangar with the with the engine shut off.  



If all this works without any leaks, move to step number 2, which is to

do exactly what Dennis said to check the compressor itself.  



Good luck.  My best guess is that you have something wrong with a line

or fitting between the compressor and the snot valve.  A common fault. 



Mark

--

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tigeryak18t

Joined: 26 Sep 2009
Posts: 233
Location: PARIS FRANCE

Posted: Tue Jan 18, 2011 2:22 pm Post subject: Compressor issue

Dennis,

As always your advice is very precious, thanks so much for this.I will proceed step by step as you write and hope to find where this problem come from. By chance I have a spare shear pin and the specific tool for removing the compressor. So if it is necessary, I will use all the bad words I know but hopefully be successful.

I'll let you know.

Thanks very much to all of you for your kind answers and particularly to Jan for his advices and his time. He is really a precious man skilled generous and patient. We are lucky to have such persons on this side of the world in addition to Dennis.

Didier Blouzard

+33(0)6 2424 3672

Le 18 janv. 2011 à 13:39, "A. Dennis Savarese" <dsavarese0812(at)bellsouth.net> a écrit :

 	  Quote: 	

 Hi Didier,

 There are 2 things that will cause the symptom you have defined.

 - The compressor has a coupling between it and the

 accessory case.  This coupling has 3 shear pins which if sheared, stops the compressor from functioning when the engine is in operation. Unfortunately, to gain access to the shear coupling the compressor has to be removed from the accessory case.  There are six 11 mm nuts around the base of the compressor where it mounts to the accessory case.  In the Russian tool box is a long T-handle tool with a curve toward the end with an 11 mm box end wrench.  Its sole purpose in life is to remove the nuts on the compressor.  Most likely you will be making a few tools to reinstall the nuts. I am certain you will use a lot of foul language removing and reinstalling the nuts because they are quite difficult to get to.  Remove everything in front of the compressor, including the exhaust section for ease of access to the base of the compressor.

 - Secondly, (and the first thing I would try) remove the output check valve from the compressor.  This is the valve where the line coming from the water separator bottle that has the banjo fitting on the end, attaches to the compressor.  The nut size I believe is 22 mm.  When you remove the output check valve, look at the flat surface.  In the center you will see a small circle about the size of a pencil eraser.  Push the circle down.  If it doesn't move, the output check valve in carboned up.  Disassemble the sections of the output check valve and clean.  The little circle I mentioned is actually a little "valve" that is held in place by a small spring which is inside the output check valve.  You will need a new set of crush washers when you reassemble.

 Once you remove the output check valve, put your thumb or finger on the hole and have someone rotate the prop.  See if you feel output pressure from the compressor.  If not, go back to removing the compressor to replace the shear coupling.

 Hope this helps.

 Dennis

 A. Dennis Savarese

 334-285-6263

 334-546-8182 (cell)

 Skype: Yakguy1

 www.yak-52.com

 On 1/18/2011 2:04 AM, Didier Blouzard wrote:

> Hi Yak friends,

> 

> My friend have a problem with the air in his 52. His air bottle does not

> refill.

> We tested yesterday part of the system and here are some symptoms.

> First the air bottle when closed does not leak.

> When opened no leak heard also and all is working properly. Gear brakes

> flaps.

> Only visible symptom is that the pressure doesn't rise. After landing

> when opening the water collector, no air is coming out.

> 

> We tryed all the following by turning the prop by hands :

> 

> I put my hand on the compressor filter and can feel the air going in.

> So we unmounted the pipe coming from the compressor to the water

> collector in order to see if air is coming out. Putting my thumb on the

> pipe with soap water, I barely could feel anything coming out...

> I blowed into the water collector and air is passing thrue.

> 

> 

> Any hints regarding these symptoms please guys???

> 

> --

> Didier BLOUZARD

> didier.blouzard(at)gmail.com <mailto:didier.blouzard(at)gmail.com>

> 0624243672

> 

> *

> 

> 

> *

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_________________
Didier Tiger YAK18T
Member of Commemorative Air Force
French Wing

HBaker

Joined: 16 Nov 2008
Posts: 119

Posted: Sun Apr 10, 2011 1:06 pm Post subject: Re: Compressor issue

How long does it take the compressor  to refill the tank , I only had it running once for about an hour, and it didn't  seem to refill.

Henry

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_________________
Currently building a Murphy Moose - any help would be appreciated.

dsavarese0812(at)bellsout
Guest

Posted: Mon Apr 11, 2011 4:45 am Post subject: Compressor issue

Of course it depends on the size of the tank.  Assuming the tank size is 

about the same as the 52's or CJ6's, I believe it usually takes about 

20-30 minutes to fill it to 50-55 ATM's if it is empty.



If the compressor is not filling the tank at all, check the banjo 

fitting security on the output check valve of the compressor.  The crush 

washers on the output check valve are critical to making a good seal 

around the banjo fitting and the output check valve itself.



If you've determined there are no leaks around the output check valve, 

remove a line downstream from the output check valve and attach a latex 

or Nitrile glove to the line and run the engine.  Obviously the glove 

should inflate quickly.  If it doesn't, then the problem could be either 

the shear coupling between the compressor and accessory case, the 

compressor itself OR the little "piston" inside the output check valve 

is carbon'd up so badly that it won't open during the compressor operation.

Dennis



On 4/10/2011 4:06 PM, HBaker wrote:

 	  Quote: 	
		   



 How long does it take the compressor  to refill the tank , I only had it running once for about an hour, and it didn't  seem to refill.

 Henry



 --------

 Currently building a Murphy Moose - any help would be appreciated.





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