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Air System Helpful Tip

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Mozam

Joined: 24 Nov 2006
Posts: 85

Posted: Fri Sep 12, 2008 10:05 am Post subject: Air System Helpful Tip

All,



I have learned MUCH on this list, and want to contribute something back.



My air system was leaking down over several days and it appeared (sounded like) the leak was in the pressure relief valve on the firewall.  I had installed a new piston in the valve just last year and assumed the rubber tip had gone bad already.



Since the pressure had leaked down to just a hair over 1 on the gauge I assumed the system was fully depleted.  So I carefully removed the top of the valve and lifted the spring out.  I looked inside the valve and saw the piston lying at the bottom of the valve.



Suddenly, there was quick hiss of air and the piston fired out of the valve, ricocheted off my head and flew out the hanger.  Luckily due to such a small amount of remaining pressure and a thick skull, no harm was done.



The fact that the piston had been stuck, combined with the piston and valve having a black carbon-like coating, and the rubber tip being in good shape lead me to believe the piston was sticking in the cylinder.  So, armed with a Q-tip I searched for something to clean the valve and piston with.



Well, guess what worked great...MARVEL MYSTERY OIL!!!!!



A couple drops of MMO removed all the deposits on the piston and valve and left them nice and shiny.  Now my valve works great and I have absolutely no leak at all.



Cheers,

Steve Dalton

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petervs(at)knology.net
Guest

Posted: Fri Sep 12, 2008 10:56 am Post subject: Air System Helpful Tip

You could have poked your eye out!



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keith(at)mckinley.us
Guest

Posted: Fri Sep 12, 2008 12:59 pm Post subject: Air System Helpful Tip

Steve,



Your post could not have been more timely! I just cleaned the  

pressure relief valve and changed the piston 1.5 hours ago. After the  

second flight I heard air leaking and found it was from that valve.  

Seemed to stop after it bleed down about 10 ATM's but I'm sure it was  

just that I couldn't hear the leak anymore. When I get back from my  

trip to Madrid I'll be looking at it armed with MMO!



Keith



On Sep 12, 2008, at 2:05 PM, Mozam wrote:



 	  Quote: 	
		   



 All,



 I have learned MUCH on this list, and want to contribute something  

 back.



 My air system was leaking down over several days and it appeared  

 (sounded like) the leak was in the pressure relief valve on the  

 firewall.  I had installed a new piston in the valve just last year  

 and assumed the rubber tip had gone bad already.



 Since the pressure had leaked down to just a hair over 1 on the  

 gauge I assumed the system was fully depleted.  So I carefully  

 removed the top of the valve and lifted the spring out.  I looked  

 inside the valve and saw the piston lying at the bottom of the valve.



 Suddenly, there was quick hiss of air and the piston fired out of  

 the valve, ricocheted off my head and flew out the hanger.  Luckily  

 due to such a small amount of remaining pressure and a thick skull,  

 no harm was done.



 The fact that the piston had been stuck, combined with the piston  

 and valve having a black carbon-like coating, and the rubber tip  

 being in good shape lead me to believe the piston was sticking in  

 the cylinder.  So, armed with a Q-tip I searched for something to  

 clear the valve and piston with.



 Well, guess what worked great...MARVEL MYSTERY OIL!!!!!



 A couple drops of MMO removed all the deposits on the piston and  

 valve and left them nice and shiny.  Now my valve works great and I  

 have absolutely no leak at all.



 Cheers,

 Steve Dalton





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 http://forums.matronics.com/viewtopic.php?p 3992#203992

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viperdoc(at)mindspring.co
Guest

Posted: Fri Sep 12, 2008 5:06 pm Post subject: Air System Helpful Tip

Amazing, dinitrobenzene acting as a solvent.

doc



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