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Schrader valve high pressure side


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VON
User

Jun 8, 2017, 11:35 PM

Post #1 of 12 (644 views)
  post locked   Schrader valve high pressure side  

 
I have a 95 Silverado C1500, 5.7, extended cab with factory A/C, 134a. My sniffer picked up a leak in the center of the high pressure side port. You can hear the leak as well. From what I understand instead of a schrader valve, it's a ball valve known to leak and highly depends on a good cap. I had a OEM cap on it, but it blew off and is MIA. I have a new GM Delco ball valve and cap.
I held a box end wrench on the nut of the lower part of the tubing where the ball valve threads into, while my brother turned the ratchet and it didn't even budge.
I was thinking about pulling vacuum and suck a little Nylog thru the ball valve in hope to seal it.
Or possibly use a impact wrench, start on low air psi setting to hopefully loosen it.
Spray some PB Blaster on it & let it soak.
Any suggestions?
Thank you for your time.


Hammer Time
Ultimate Carjunky / Moderator
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Jun 9, 2017, 5:11 AM

Post #2 of 12 (640 views)
  post locked   Re: Schrader valve high pressure side  

I'm betting you had the wrench in the wrong spot. Most of that hex nut is actually part of the pipe. They make a special socket for removing the shraeder.








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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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Jun 9, 2017, 5:38 AM

Post #3 of 12 (635 views)
  post locked   Re: Schrader valve high pressure side  

VON-All: These can bust the pipe - no air wrenches! Do yourself a favor and either with a Q-Tip or change spray nozzle to one from brand Gummout's spray nozzle will fit PB which makes a mess. Do all the fitting that are threaded now. They can and will be as good as welded and make this a monster job thing no behaving down the line.


True on the cap it is the real seal not the ball most leak a tad and will quit or not. With cap on you shouldn't have been able to sniff a leak there IMO or cap was NG anyway,


T



Hammer Time
Ultimate Carjunky / Moderator
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Jun 9, 2017, 5:42 AM

Post #4 of 12 (631 views)
  post locked   Re: Schrader valve high pressure side  

All you have to do is hold the base in place so the line doesn't twist while loosening the valve itself. Just make sure it is only the valve that you are trying to turn. They don't corrode and will come apart quite easily when grabbed correctly.

Just don't mark up the new one with pliers. Be careful where you grab it.



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

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.



VON
User

Jun 9, 2017, 7:24 AM

Post #5 of 12 (621 views)
  post locked   Re: Schrader valve high pressure side  

HT, Any suggestions where to find the special socket for removing the shraeder? Thanks


VON
User

Jun 9, 2017, 7:34 AM

Post #6 of 12 (617 views)
  post locked   Re: Schrader valve high pressure side  

Tom, You are correct, with cap on I was not able to sniff a leak there but the leak built up enough pressure to blow off a OEM cap & is no where to be found.
Thanks.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jun 9, 2017, 7:35 AM

Post #7 of 12 (615 views)
  post locked   Re: Schrader valve high pressure side  

Here is one of many I found on Google SOCKET

Here is the part number for on3e of them
Mastercool 98234



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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
Ultimate Carjunky / Moderator
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Jun 9, 2017, 8:01 AM

Post #8 of 12 (606 views)
  post locked   Re: Schrader valve high pressure side  

Just cap: If a decent junkyard available go get a couple OE ones. Make sure the rubber gasket inside is good then when proven tight you really don't need to touch it again. It was dumb IMO to make ball valves as the fail so much. You'll find if you do more there are more and more vehicles with no high side port at all it's really not needed - handy if a problem but can find the pressure just knowing the temp of the line right at it. I'm hooked on infrared touchless thermometer just fussy if windy and can't shield fan air when checking,


T



(This post was edited by Tom Greenleaf on Jun 9, 2017, 8:03 AM)


Sidom
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Jun 12, 2017, 12:05 PM

Post #9 of 12 (569 views)
  post locked   Re: Schrader valve high pressure side  

Those are hands down the worst fitting out there.....Any system I worked on got a new one regardless if I had to evacuate the system.....
One tip that does keep them from leaking.....When you hook up your manifold set/machine, when you attach the high side adaptor, when you screw it down, look at the gauge and as soon as you get pressure stop, go a 1/4 turn more max and leave it there.....A lot of times if you open the adaptor fully and bottom it out, this can cause a good fitting to leak






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Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jun 12, 2017, 12:29 PM

Post #10 of 12 (565 views)
  post locked   Re: Schrader valve high pressure side  

Good point Brian. i always do that. Never remove them with the AC on either.



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

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.



VON
User

Jun 14, 2017, 4:38 PM

Post #11 of 12 (544 views)
  post locked   Re: Schrader valve high pressure side  

Hammer Time, You are correct, I had the wrench in the wrong spot. Everything seems to be working good. Thanks to everybody for your help and advice.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jun 14, 2017, 4:45 PM

Post #12 of 12 (542 views)
  post locked   Re: Schrader valve high pressure side  

Glad to hear to got it resolved.

Closing this now as solved.



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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.







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