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Overcharged, blown compressor gasket


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Hammer Time
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Aug 8, 2017, 3:35 PM

Post #51 of 84 (556 views)
  post locked   Re: Overcharged, blown compressor gasket  

That is there to seal air leakage. As it deteriorates you will experience leakage which will result in air flow mixing an leakage.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



jjrbus
User

Aug 11, 2017, 9:30 AM

Post #52 of 84 (524 views)
  post locked   Re: Overcharged, blown compressor gasket  

Oh oh! I got everything back together, with new pressure switch and new expansion valve, vacuumed down and let sit over night, no leaks under vacuum so I started to charge with gas. Within a couple minutes the low side is showing 74 lbs and the high side is about 150, it has taken about 4 oz of gas. Something does not seem right so I shut the gas off and will wait for a response. 91° ambient.
Jim


(This post was edited by jjrbus on Aug 11, 2017, 9:32 AM)


Hammer Time
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Aug 11, 2017, 9:35 AM

Post #53 of 84 (518 views)
  post locked   Re: Overcharged, blown compressor gasket  

You have to get the correct charge in there before trying to diagnose anything. As long as the high side doesn't skyrocket, it's safe to keep charging.

Remember, if the valve to the can is open, the pressure will read higher. You have to stop the charge to get a correct low pressure reading.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



jjrbus
User

Aug 11, 2017, 10:37 AM

Post #54 of 84 (509 views)
  post locked   Re: Overcharged, blown compressor gasket  

I do not remember this happening last time. My lo side scale is not very accurate from 120 to 350, when adding gas the gauge is heading up in the 300 area, if I turn the valve off it drops back to 105, the high side is reading is 125. Gas seems to be going in very slow.

Thanks for the quick response.


Hammer Time
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Aug 11, 2017, 10:43 AM

Post #55 of 84 (503 views)
  post locked   Re: Overcharged, blown compressor gasket  

I don't understand what you are saying one bit.

There is no way the low side is going up to 300. The gauge doesn't go that high, and it certainly can't happen if the high side is only 125PSI.

What are the actual pressures?



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Tom Greenleaf
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Aug 11, 2017, 10:44 AM

Post #56 of 84 (501 views)
  post locked   Re: Overcharged, blown compressor gasket  

Just asking - long thread big time. Are you familiar with your gauges and how to use them AND you shut off the red hose while charging if not nothing is going to read right and you could blow up your source container with high side pressure?


T



jjrbus
User

Aug 11, 2017, 10:47 AM

Post #57 of 84 (496 views)
  post locked   Re: Overcharged, blown compressor gasket  

You told me what to do and I completely missed it. Turn off the refrigerant, I turned off the blue handle on the gauge! I need to turn off the can. When I turn off the can the pressure drops to 120 on the low side.


jjrbus
User

Aug 11, 2017, 10:50 AM

Post #58 of 84 (491 views)
  post locked   Re: Overcharged, blown compressor gasket  

Yes Tom I have used the gauges before and you talked me through charging it about 2 years ago. I am also trying to follow your pinned instructions.


jjrbus
User

Aug 11, 2017, 10:52 AM

Post #59 of 84 (489 views)
  post locked   Re: Overcharged, blown compressor gasket  

High side (red) is definitely off and reading 125.

My gauge goes to 350 on the low side, but not readable from 120 to 350.


(This post was edited by jjrbus on Aug 11, 2017, 10:54 AM)


Tom Greenleaf
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Aug 11, 2017, 10:53 AM

Post #60 of 84 (487 views)
  post locked   Re: Overcharged, blown compressor gasket  

This is so messed up now I'd recover what's in there and start over from a well held vacuum. Just leave the red alone while charging and watch the # while attached. Blue closed open source it should read source pressure then open blue to charge gas in. Shut down knob or what it is at manifold it's now reading low side pressure while engaged.


Lots of assorted "manifold/gauge sets" so yours may be slightly different and have to know what is going on where or this is never going to work,


T



Hammer Time
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Aug 11, 2017, 11:08 AM

Post #61 of 84 (476 views)
  post locked   Re: Overcharged, blown compressor gasket  

I don't know what you are doing wrong or what could be wrong with your gauges but there is no way in hell that your low side EVER hits 300PSI or anything even close to that. It's simply not possible so you probably should start out with a different set of gauges.

PS, Make damn sure you never open the red valve while the engine is running. That could result in that can exploding in your hand.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



jjrbus
User

Aug 11, 2017, 11:10 AM

Post #62 of 84 (474 views)
  post locked   Re: Overcharged, blown compressor gasket  

Now with gas turned off at can and blue and red valve closed both are reading about 110 at idle.

I won't be able to get system evacuated till next week.

Will get back to you then. Thank you very much. Jim


Tom Greenleaf
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Aug 11, 2017, 11:18 AM

Post #63 of 84 (468 views)
  post locked   Re: Overcharged, blown compressor gasket  

That's now just a "static" pressure if both the same or compressor not engaged or doing nothing at all. That' if you know gauges are working? 110 PSI means system if any refrigerant in it - couple ounces to jammed full is about 93F - that you could touch no problem. Careful - if hot and see those pressure something is all wrong with gauges or the way you are doing it?


T



jjrbus
User

Aug 11, 2017, 12:40 PM

Post #64 of 84 (462 views)
  post locked   Re: Overcharged, blown compressor gasket  

I will try to borrow gauges from Auto Zone and compare against my gauges. My gauges are Harbor Freight best and have been sitting for a couple years.


Tom Greenleaf
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Aug 11, 2017, 1:41 PM

Post #65 of 84 (454 views)
  post locked   Re: Overcharged, blown compressor gasket  

Good idea. Compare accuracy with about anything. Just know (I don't) what they rent might be all different than what you have to do the exact same thing just how it connects to ports and shuts offs. I didn't look back but is using a 30 lb bottle of 134a easy to check just the static pressure of the bottle you can do that with small cans if you have assorted adaptors (made my own) to see how they operate.


It's a battle and losing is no fun at all on the wallet hopefully not any freeze burns to you is the real risk IMO,


T



Sidom
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Aug 11, 2017, 2:13 PM

Post #66 of 84 (446 views)
  post locked   Re: Overcharged, blown compressor gasket  

The retard portion of the low side gauge does max at 350...

It's scaleable to 120 and then just the black retard section ending at 350


Hammer Time
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Aug 11, 2017, 2:38 PM

Post #67 of 84 (442 views)
  post locked   Re: Overcharged, blown compressor gasket  

The gauge I have here only shows 240 in that section but that is an area beyond the normal numbered scale which only goes to 110.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



jjrbus
User

Aug 11, 2017, 3:01 PM

Post #68 of 84 (436 views)
  post locked   Re: Overcharged, blown compressor gasket  

Sidom describes it well, scaleable to 120 and then a black section that says "retard" and ends at 350 with no scale from 120 to 350.

Curiosity got the best of me I went to Auto Zone and rented a manifold set. I got it hooked up and am getting 98 on the low and about the same on the high side at idle. Started to rain so will have to put it off till tomorrow.


Hammer Time
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Aug 11, 2017, 3:22 PM

Post #69 of 84 (432 views)
  post locked   Re: Overcharged, blown compressor gasket  

Sure sounds like your compressor is not even engaged.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Tom Greenleaf
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Aug 11, 2017, 3:26 PM

Post #70 of 84 (428 views)
  post locked   Re: Overcharged, blown compressor gasket  

Yes - that's just static pressure. This chart is spot on, hope it shows you can see the temp/pressure relationship harder to see when liquid or a vapor,


>

Hope that shows,


T



Sidom
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Aug 11, 2017, 3:45 PM

Post #71 of 84 (420 views)
  post locked   Re: Overcharged, blown compressor gasket  


In Reply To
Sure sounds like your compressor is not even engaged.



Sounds like it.....If it is engaged,, with those readings,, even with a half charge the comp is bad


jjrbus
User

Aug 12, 2017, 6:30 AM

Post #72 of 84 (406 views)
  post locked   Re: Overcharged, blown compressor gasket  

Color me embarrassed, I don't even want to admit I did something like this. I can't blame this one on the cat or the wife, I have to own it. I can't see the compressor, hearing is not that good so I don't hear it click on but it has been working well so not concerned. The pros are saying sounds like the compressor is not on, so I better look. It's not on!

Nothing obviously wrong, until I look inside, I neglected to plug in the AC amplifier. Now everything seems to be working right, finished the first can of 134a, will finish this up and report back.


Tom Greenleaf
Ultimate Carjunky / Moderator
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Aug 12, 2017, 6:53 AM

Post #73 of 84 (400 views)
  post locked   Re: Overcharged, blown compressor gasket  

Ok - stuff happens and that explains it. Just this compressor shouldn't be hard to see with engine layout. Know probably already said that the clutch is a separate item really just mounted ON a compressor when it pulls in, compressor is working and when outer hub is still it's really nothing but a pulley for the belt nothing more.


The troubles with engaging for about '93 would be low charge below a minimum, there's a gap in the clutch that can wear too wide to pull it in to engage that is adjustable most take tools to do that. While messing with it everything off - cold even measure that. .020 is almost a standard if no feeler gauge fold a common biz card hard should barely fit in the gap.
Thread's long makes this hard if a repeat sorry. First can if little cans should almost all go into a full vacuum - engine off and cold. That alone really should be done first can if little cans. Then compressor should engage and probably shut down as too low. To refresh or again know that if using engine running and compressor to PULL in refrigerant you want to get close but know you are not overcharged right away as the oil doesn't circulate when super low for the compressor.


Then when it's blow some cold, pressures look even fair finish off the charge, warm up those cans with warm water not too hot to touch warm as needed. This is the time finishing it NOT to put too much in so when close stop. I suggest drive around the block with A/C blasting let oils all settle and it stabilizes where it really is then finish off the last few ounces very carefully watching everything possible,


T



Hammer Time
Ultimate Carjunky / Moderator
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Aug 12, 2017, 7:00 AM

Post #74 of 84 (397 views)
  post locked   Re: Overcharged, blown compressor gasket  


Quote
Oh oh! I got everything back together, with new pressure switch and new expansion valve, vacuumed down and let sit over night, no leaks under vacuum so I started to charge with gas.


Yeah, so much for that diagnosis of a gushing front seal.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



jjrbus
User

Aug 12, 2017, 7:14 AM

Post #75 of 84 (391 views)
  post locked   Re: Overcharged, blown compressor gasket  


In Reply To

Quote
Oh oh! I got everything back together, with new pressure switch and new expansion valve, vacuumed down and let sit over night, no leaks under vacuum so I started to charge with gas.


Yeah, so much for that diagnosis of a gushing front seal.

So much for a $1200 repair bill!







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