TAKdriver

TAKdriver

Active Member
Just opened up exhaust diaphgram : expecting new parts in mail tomorrow.
Inside I found this little piece of crud lodged across diaphgram : on examination it looks like a little piece of string ! Part was flattened and I see a mark on the diaphgram itself which may be a tiny indentation which corresponds to the "string" >
I have not yet examined the bits 'n pieces to see if this is debris from something breaking up or is a piece of crud which has been there since it was assembled.

Could this be the cause of my air loss at the exhaust or is it more likely to be a symptom arising from something breaking up ?
 

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I wonder where that came from? Maybe it's been apart before and someone was careless.
If it was stopping the diaphragm sealing it may well have been the problem.
 
Datatek said:
I wonder where that came from? Maybe it's been apart before and someone was careless.
If it was stopping the diaphragm sealing it may well have been the problem.
Click to expand...

It doesn't bear any immediate resemblance to anything in there : I'll examine the diaphgram in detail when to new one arrives.
I suppose with the movement and air pressure going through there it also has the potential to move around which could cause intermittent probs.
The valve block has not been opened in at least the 8 years the car has been in the family ( was previously son in laws)
 
Datatek said:
I wonder where that came from? Maybe it's been apart before and someone was careless.
If it was stopping the diaphragm sealing it may well have been the problem.
Click to expand...
Data
Could you have a careful look at the second pic : is there anything you would diagnose from the colour/condition of the situation under the diaphragm ?
 
TAKdriver said:
Data
Could you have a careful look at the second pic : is there anything you would diagnose from the colour/condition of the situation under the diaphragm ?
Click to expand...
It looks a bit white in the picture, could just be the light but if there is a white film on the surfaces, it's the dryer desiccant breaking up.:)
 
Datatek said:
It looks a bit white in the picture, could just be the light but if there is a white film on the surfaces, it's the dryer desiccant breaking up.:)
Click to expand...
I was going to say I could see white flecks and also the edges of the hole look to be oxidised/rust coloured and could be an indication of moist air getting through!
 
The white flecks are all around the bolt holes residue of thread retainer by the look of it. Looks like some has found it's way into valve. Don't think there is a problem with that. Just blow off and clean out. As Data says hard to tell but maybe signs of a little white deposit coating on valve seat. But as he says maybe the light. Dessicant breakup is usually a very fine white powder. Usually attaches itself to solenoid valve end seals putting a crust on them. A photo of the diaphragm itself may have given a better diagnostic indication.
 
defender300td1 said:
Think you lot need your eyes testing pink around threads white around diagpham I'd change air dryer :)
Click to expand...

There is indeed some pink around the threads but also a lot of white flecking. The same white flecking seen in and around the valve. The white flecking is residue of corrosion in the alloy caused by interaction of dissimilar metals with moisture or the thread locking agent itself. Dessicant break up does not produce flecking it produces very fine powder.
 
wammers said:
There is indeed some pink around the threads but also a lot of white flecking. The same white flecking seen in and around the valve. The white flecking is residue of corrosion in the alloy caused by interaction of dissimilar metals with moisture or the thread locking agent itself. Dessicant break up does not produce flecking it produces very fine powder.
Click to expand...

Where's the moist Coming from the dryer isn't doing its job :p
 
defender300td1 said:
I have and, anyway the air that's traveling through the system is. Nowhere near the blocks four securing bolts ...,
Click to expand...

Yeah i know that, so how can moisture within the system affect the bolt threads? Which is what you implied earlier. The valve block heats and cools maybe the moisture got there from the moisture in the atmosphere around the valve block. And condensated as it cooled what do you think?
 
wammers said:
Yeah i know that, so how can moisture within the system affect the bolt threads? Which is what you implied earlier. The valve block heats and cools maybe the moisture got there from the moisture in the atmosphere around the valve block. And condensated as it cooled what do you think?
Click to expand...

No I said pink around thread and white around diagpham indicating new dryer for and because of diagpham . I would of thought such constant use of moist air flowing through due to In a sufficient dryer is the cause and once left overnight it when you would get a build up not just condensation the threads are unimportant as long as cleaned and of good threads .oxidation on aluminium is probably due to steel alen key bolts :)
 
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defender300td1 said:
No I said pink around thread and white around diagpham indicating new dryer for and because of diagpham . I would of thought such constant use of moist air flowing through due to In a sufficient dryer is the cause and once left overnight it when you would get a build up not just condensation the threads are unimportant as long as cleaned and of good threads .oxidation on aluminium is probably due to steel alen key bolts :)
Click to expand...

But i have already said all that. You said it needed a new dried because of the flecks in the valve, they clearly come from the bolts they are not dessicant. They are all over the face of the block. Moist air is supposed to come out of the exhaust past the diaphragm. That is how the system works. When compressed air is being put into the tank from the compressor, it travels up through the drier to the valve block and then to the tank. When the compressor stops the pressure in the galley and drier is vented in the reverse direction as the diaphragm solenoid valve opens and vents via the 4 mm pipe the air holding the diaphragm shut. Down through the drier to blow any moisture out past the diaphragm and out of the exhaust. A better indicator of dessicant break down would be a white powder crust on the diaphragm itself. But we do not have an image of that.
 
wammers said:
But i have already said all that. You said it needed a new dried because of the flecks in the valve, they clearly come from the bolts they are not dessicant. They are all over the face of the block. Moist air is supposed to come out of the exhaust past the diaphragm. That is how the system works. When compressed air is being put into the tank from the compressor, it travels up through the drier to the valve block and then to the tank. When the compressor stops the pressure in the galley and drier is vented in the reverse direction as the diaphragm solenoid valve opens and vents via the 4 mm pipe the air holding the diaphragm shut. Down through the drier to blow any moisture out past the diaphragm and out of the exhaust. A better indicator of dessicant break down would be a white powder crust on the diaphragm itself. But we do not have an image of that.
Click to expand...

It looks white to me around the diagpham the tread lock looks pink as I said Earlier test your eyes
 
defender300td1 said:
It looks white to me around the diagpham the tread lock looks pink as I said Earlier test your eyes
Click to expand...

The deposits in the valve are clearly from the bolts. White debris from the remains of the thread lock are all over the face of the block. When you use Locktite it goes on green or red or blue and comes out from where it has been under pressure from the action of removing the bolt white. Only the excess that has not been actually in the thread retains it's colour. Dessicant DOES NOT produce flakes it produces very fine powder. Make a brew and relax and accept that you have learned something.:):)
 
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