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What are the major leakage areas on an R4 compressor?

DontKnowSquat on Mon May 11, 2009 6:24 PM User is offlineView users profile

I'm rebuilding an R4 compressor. My coil failed, (bought a NOS one). I've got everything dismantled except for the shaft assembly, (it's also NOS, Delco Remy). No problem there. I'm curious and for future reference, what are the major leakage areas on an R4 compressor? Is it just the two rubber 'O' rings on the shell to shaft assembly or are there any others?

I remember a while back ago I converted quite a few of my previously owned older GM R4 compressors from R12 to R134a. The kits consisted of a sealant with various rubber grommets, (in addition to the refrigerant purchased separately). When the A/C system failed, I had it checked to see if it was any other component. If it was only the compressor, (which turned out to be 100% of the time), I simply used these conversion kits and they worked marvelously for the life of the car.

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DIY'er for life!!

Chick on Mon May 11, 2009 7:14 PM User is offlineView users profile

Biggest leak areas are the Two body/case O rings and shaft seals..

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

DontKnowSquat on Mon May 11, 2009 9:41 PM User is offlineView users profile

Quote
Originally posted by: Chick
Biggest leak areas are the Two body/case O rings and shaft seals..

Yep...that's one of the areas I mentioned on my post. Any other areas?

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DIY'er for life!!

GM Tech on Mon May 11, 2009 10:20 PM User is offline

There is only one other rubber seal- the front head to cylinder-- which is very rare to leak- or the high pressure switch seal- which is rare as well...

Ditto all Chick's comments...

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The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

DontKnowSquat on Tue May 12, 2009 6:22 PM User is offlineView users profile

OK...great. What about the shaft seals?

I have both types for my R4, the ceramic seal with carbon shaft, and the lip seal. Which one is better? Also, the rubber Delco seals for the shell are NOS, but that was what they used with R12. I've noticed that now-a-days the rubber seals for the R134a conversion are green.
Should I use the rubber black ones that come with the NOS kit, or should I buy the newer green ones?

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DIY'er for life!!

GM Tech on Wed May 13, 2009 8:50 AM User is offline

Ceramic seal is circa 1984 and prior-- avoid it- plus, it won't work on your shaft - it has no flats...for the carbon seal.

here is what I use a/c delco #15-30948 or gm# 2724954


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The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

DontKnowSquat on Wed May 13, 2009 9:10 AM User is offlineView users profile

O.K. what about the (body/case), shell seals I mentioned? Also were can I buy a/c delco #15-30948?

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DIY'er for life!!

Edited: Wed May 13, 2009 at 9:12 AM by DontKnowSquat

Chick on Wed May 13, 2009 2:29 PM User is offlineView users profile

The GM 2724954 or a/c delco #15-30948 is the same as the board sponsors 21-34734 double lipped shaft seal. Or a GM dealer will have them, but twice as much as the sponsors shaft seals.. Send them an e-mail at

ackits.com and ask them about the other O rings you need.. I thinbk they can get the body case O rings that are compatable with R134a.. Hope this helps..

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

DontKnowSquat on Wed May 13, 2009 3:30 PM User is offlineView users profile

Quote
Originally posted by: Chick
The GM 2724954 or a/c delco #15-30948 is the same as the board sponsors 21-34734 double lipped shaft seal. Or a GM dealer will have them, but twice as much as the sponsors shaft seals.. Send them an e-mail at ackits.com and ask them about the other O rings you need.. I think they can get the body case O rings that are comparable with R134a.. Hope this helps..


Thanks! Those are my intentions. Jut wanted to make sure they stocked them. I searched their site and found the shaft seals but not the shell. Wanted to buy as a package, I'll e-mail and ask. Thanks for the heads-up.


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DIY'er for life!!

Edited: Wed May 13, 2009 at 3:30 PM by DontKnowSquat

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