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Replacing A/C Expansion Valve |
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White70JavelinSST
Supporter of TheAMCForum Joined: Aug/08/2012 Location: Minnesota Status: Offline Points: 4866 |
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Posted: Aug/09/2017 at 4:47pm |
Remember when using two wrenches in unison like that, one to hold the body and one to move the nut, the closer the two wrenches are to each other when trying to loosen the nut the better control and more power you will have. If the two are spread apart too far it puts your hands at a disadvantage.
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70 Javelin SST, second owner, purchased 1972
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amcenthusiast
AMC Addicted Joined: Jul/02/2012 Location: SW Atlanta GA Status: Offline Points: 1778 |
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Last expansion valve I did was on a '65 Marlin by buying a big expensive open and closed end wrench to fit on the evaporator core side and customized it so I could put an extension on it for more leverage= I was able to get enough leverage to pop it loose/worked for me.
I'm pretty sure that when R134a is mixed with the old refrigerant the combination forms crystalized abrasives in the system; this may the cause of your compressor seal failures... (some refrigerant leaks past the compressor pistons and gets into crankcase oil) -the entire system needs to be flushed/rinsed out with mineral spirits, blown out with compressed air, including the compressor crankcase to get rid of any trace of the older refrigerant and oils when putting new 134a into an older system. |
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443 XRV8 Gremlin YouTube video: https://www.youtube.com/watch?reload=9&v=2DmFOKRuzUc
XRV8 Race Parts website: http://amcramblermarlin.1colony.com/ |
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EdwardSharp
AMC Fan Joined: Aug/08/2017 Location: Tigard Status: Offline Points: 1 |
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For replacing A/C expansion valve or any other problems related air conditioners I would suggest to contact local air conditioning service essex county nj experts, who has relevant amount to experience and knowledge to solve your problem effectively. Get more info at :
https://essexheatingcooling.com |
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401MATCOUPE
AMC Addicted Joined: May/20/2010 Location: Salisbury, MD Status: Offline Points: 5367 |
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Steve,
They have these great electronic sniffers now that can find leaks down to 1/10 ounce per year.....they work great. This is a new version of what I have. http://www.mastercool.com/product/55200/ Ross
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Ross K. Peterson
68X,GoPac,343,AT,52A(1stCar) 68X,GoPac,390,4sp,52A 69X,GoPac,390,4sp,64A 70X,GoPac,390,4sp,87A,8 70X,GoPac,390,4sp,BBO,8 70 Jav SST,390,AT,BSO 74MatX,401,AT,Prototype 74MatX,401,AT |
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S Curry
AMC Addicted Joined: Aug/16/2012 Location: Iowa Status: Offline Points: 598 |
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Ross. Thanks for that info. Maybe that is why you don't see them anymore. I'm sure there are better devices for finding leaks. That is what we used. It was a hose attached to the lower side of the bonnet on a hand held propane torch. It would turn colors when finding a leak. Not very handy while under the dash. Would vac 'em down for a half hour, charge them up, do a quick checks for leaks and check high and low side pressure and out the door.....time was money!!
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SC
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6768rogues
AMC Addicted Joined: Jul/03/2007 Location: United States Status: Offline Points: 6237 |
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If you replaced the dryer, a short time under vacuum will do. If not, I leave 27 inches of vacuum on for 8 hours or so. That will test the system for leaks and boil out any moisture in the system. Water boils at about 70 degrees under 27 inches of vacuum, so it is a good way to dry things out if they are being reused.
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Content intended for mature audiences. If you experience nausea or diarrhea, stop reading and seek medical attention.
Located usually near Rochester, NY and sometimes central FL. |
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CamJam
Moderator Group Joined: Jan/04/2014 Location: Arizona Status: Offline Points: 6549 |
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Thanks for the helpful advice, everyone!
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401MATCOUPE
AMC Addicted Joined: May/20/2010 Location: Salisbury, MD Status: Offline Points: 5367 |
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Steve/All, I am not sure the R-134a and torch will work like it did with R-12.....BUT it was a terrible idea, the combustion by products are PHOSGENE GAS....aka Mustard Gas.....extremely toxic. Phosgene Gas killed more people in WW1 then any other agent. This is from an HVAC site....... Being extremely toxic in small amounts, phosgene formation was a real concern when traditional refrigerants (R11, R- 12, R- 113, R- 114) decomposed. Phosgene contains two chlorine atoms and an oxygen atom. It will only form when oxygen is present and only the refrigerants with chlorine attached will produce phosgene (not HFCs). R22 has only one chlorine atom per molecule, so it is extremely difficult, chemically speaking, to get another one attached to form phosgene. Decomposition of R-22 or HFCs may form other carbonyl fluorides, however they are not as toxic as phosgene. |
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Ross K. Peterson
68X,GoPac,343,AT,52A(1stCar) 68X,GoPac,390,4sp,52A 69X,GoPac,390,4sp,64A 70X,GoPac,390,4sp,87A,8 70X,GoPac,390,4sp,BBO,8 70 Jav SST,390,AT,BSO 74MatX,401,AT,Prototype 74MatX,401,AT |
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S Curry
AMC Addicted Joined: Aug/16/2012 Location: Iowa Status: Offline Points: 598 |
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Forty two years ago this month, I started working at a AMC dealer. Folks were just starting to use AC and finding out that it wouldn't cool. I bet that month of May I changed out seals on 20 vehicles. Seal would dry up over the winter month and would fail when needed. Yes, I had to do a few twice. Keep everything extremely clean while assembling. Lint free rags are a must, too. I would vac down for 30 min. and charge up and run a leak test. Propane torch with a hose on it...........
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SC
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401MATCOUPE
AMC Addicted Joined: May/20/2010 Location: Salisbury, MD Status: Offline Points: 5367 |
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Cameron...I NEVER put together any AMC system without replacing the Expansion Valve...but that is water under the bridge....the expansion valve would have no effect on the Compressor Seal. I have had poor luck myself in successfully replacing the front seal, seems simple enough, but 3 out of 3 replacements blew the front seal again and I just replaced the compressor......that was with R-12, so not near as bad a hit with R-134a.
Just make sure you if you lost system oil when the seal blew, put oil back in the system. The best way to change the expansion valve is to remove the throttle pedal and drivers seat...that gives you enough room to use the TWO wrenches you need to break the lines loose. DO NOT attempt to undo the nut on the hose, without backing up the tube from evaporator.......you may need to borrow a friends set of angle wrenches. Hope this helps.....
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Ross K. Peterson
68X,GoPac,343,AT,52A(1stCar) 68X,GoPac,390,4sp,52A 69X,GoPac,390,4sp,64A 70X,GoPac,390,4sp,87A,8 70X,GoPac,390,4sp,BBO,8 70 Jav SST,390,AT,BSO 74MatX,401,AT,Prototype 74MatX,401,AT |
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