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The MG Pony
17-04-2007, 07:55 AM
Well today I was charged with taking out an old plant from an old sandwich cooler. So I removed the plant and be for cleaning it up I was told to check it. So I pulled a vac (The unit had leaked dry) and it actually held just fine, So I tested and noticed pressure wasn't holding well (But yet it held a vac!) So I went through and tested each part with soap water and BANG found the sight Glass bubbling away. I never seen this be for, How often does that occur?

I swapped out with a new sight glass and F/D and it's purring away, but was rather curious that a sight glass was leaking!
lana
17-04-2007, 08:59 AM
Hi The MG Pony,
I once had leakage form a sight glass on a receiver. This sight glass was flare type (the glass part).
Otherwise not seen leakage from them.
Cheers
The MG Pony
17-04-2007, 09:16 AM
Ya thats where it was leaking from! Around the glass:eek: It was a R-134a system so pressur wasn't even that high! Orrigionaly R-12 but the tech who last worked on it replaced the sight glass comp, and F/D.
malik55
17-04-2007, 07:10 PM
The MG pony
Sight glass do leaks due to gaskets, you have already replaced with a new one, Why not open old one and check it,
malik55
monkey spanners
17-04-2007, 08:05 PM
Took this picture of a sight glass last week. Believe it or not it was'nt leaking.

Cheers Jon
ianybeany
17-04-2007, 09:03 PM
When you say it held a vac, was this on a proper torr or milli bar gauge, and for how long?
Brian_UK
17-04-2007, 10:37 PM
It could hold a vacuum as the seal can get pulled into/onto the mating surfaces/threads.
The MG Pony
17-04-2007, 11:33 PM
800 mTorr for a fiew minutes (Ya My pump is gimped I think)
wkd
18-04-2007, 07:15 PM
Brian is right ,have seen this many times on package chillers.
taz24
19-04-2007, 12:56 AM
So I went through and tested each part with soap water and BANG found the sight Glass bubbling away. I never seen this be for, How often does that occur?

I swapped out with a new sight glass and F/D and it's purring away, but was rather curious that a sight glass was leaking!


Quite a common fault.
It did not show on the vac as others stated because it pulled itself in and sealed.
Now you've found it once you will Know to look for it again:)

Cheers taz.
The MG Pony
19-04-2007, 06:09 AM
Ya, first time for me too never would have sustected a sight glass, a drip fell on it as I moved the brush to the other flare and noticed slight bubles so put a full drop on and well!