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  #46  
Old 07-11-2010, 01:55 AM
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I pulled the original compressor that was in Thayer's car, and it has the x on the bottom...
it was failing, but cooling OK so far. we were not going to change it out until the leaking seal could not be found, so we put in a rebuilt one.
I'm holding the compressor upside down for the picture...

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dissembling R4 compressor-0710101650a.jpg  
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  #47  
Old 07-11-2010, 08:00 AM
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John, is that a Delco R4? Is it orig or reman?

Do you know how to get the casing off my partially disassemnled R4? Is it sealed by 2 large o-rings?
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  #48  
Old 07-11-2010, 08:06 AM
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oh, it's a reman.
I think he said he had it changed a few months ago...
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  #49  
Old 07-11-2010, 08:41 AM
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Quote:
Originally Posted by vstech View Post
oh, it's a reman.
I think he said he had it changed a few months ago...
Judging by the bad rep of reman auto parts I've read about, I'd say it is more likely for a reman R4 to have the hole in the wong spot than an orig Delco as it comes from Mercedes.
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  #50  
Old 07-11-2010, 08:44 AM
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Quote:
Originally Posted by vstech View Post
...
it was failing, but cooling OK so far. we were not going to change it out until the leaking seal could not be found, so we put in a rebuilt one....
I am scratching my head trying to figure out the logic.
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  #51  
Old 07-11-2010, 10:31 AM
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It was an ebay compressor. I was completely satisfied with its compressing of the 134a.

We couldn't get a good seal on it to charge it with the 12. I needed ac and so we scrammed over to the parts house to get one that we knew would seal.

If the AC guy I had last summer do my ac didn't do a proper flush, that compressor might actually have some life left in it. (meaning that the gunk we found in the lines was from the previous compressor and not the one currently in his hands) We would just need to make it seal (which we couldn't do in the time allotted).

finally got the money shot of the burst main seal on the current compressor.

I feel like a just took out an attractive, but not overly attractive girl to a chick flick and then to a very nice restaurant, listened to all her stories, laughed when I was supposed to, held the door, complimented interesting things about her, perfect gentlemen, only to find out she is a co dependent basket case. (As I read that, that could also be an analogy for the whole &#%$%*@ car)

It's pointed towards the belt assembly so its not a photographer's dream but it shows the damage.
Attached Thumbnails
dissembling R4 compressor-imag0132.jpg  
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Last edited by thayer; 07-11-2010 at 10:54 AM.
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  #52  
Old 07-11-2010, 10:42 AM
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Thayer, which seal is leaking on the ebay compressor? Afaik, there is a seal on the main shaft, a seal on the cover, and problably 2 seals on the casing, in order from small to large, diameter wise. How about the current compressor from the parts house? What has failed in it and does it have the oil hole at 12 o'clock?. Good you dug up this obscure but important piece of info with regards to the oil hole mark on the R4.
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  #53  
Old 07-11-2010, 10:55 AM
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Quote:
Originally Posted by funola View Post
Thayer, which seal is leaking on the ebay compressor? Afaik, there is a seal on the main shaft, a seal on the cover, and problably 2 seals on the casing, in order from small to large, diameter wise. How about the current compressor from the parts house? What has failed in it and does it have the oil hole at 12 o'clock?. Good you dug up this obscure but important piece of info with regards to the oil hole mark on the R4.
ask and you shall receive. check previous post.

I'll keep trying to find the oil hole mark. Its hard to see b/c its in the shed with no steering wheel/cluster/blower motor. (I'm doing some dash overhaul due to the fact that I can't drive that thing in the 90s with no AC)
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77' 300D, "Cartman" SOLD @ 150K (didn't know what I had)
83' 300SD, "The Superdon" 325k+ @ 28mpg
95 E320 wagon, "Millennium Falcon" 231k+ @ 24 Mpg
95 E300D, "Sherley" 308k @ 33.69 Mpg, currently anticipating a head
99 Suzuki Intruder "Trudy" @ 45 mpg
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  #54  
Old 07-11-2010, 10:57 AM
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Quote:
Originally Posted by vstech View Post
I pulled the original compressor that was in Thayer's car, and it has the x on the bottom...
it was failing, but cooling OK so far. we were not going to change it out until the leaking seal could not be found, so we put in a rebuilt one.
I'm holding the compressor upside down for the picture...
I'm confused. The "original" or a re-man, or maybe simply used? Is Harrison still in business? Wouldn't a re-man relabel the part?

I pulled a non-OE Harrison compressor off my '83 300CD and it had the X on the top. I have a brand new Compressor Works and it has the "stamp" (no X) on the bottom. I know the Harrison is at least a '94, because I have the receipt from the PO when it was replaced by a shop in '94 (useless trivia, cost in '94: parts $300, labor + another $200).

I think I understand the oiling effect in theory: when the X is on the top, oil splashes/sprays around and collects in the hole, then gradually trickles down onto the bearing or shaft. If it's on the bottom, there is no "continuous" oiling effect.

But it looks like the hole is "in front" of the bearing (when mounted). So does the oil get out onto the other side of the bearing?

Q for Funola: Is that rust or corrosion on the shaft where it would rotate on the bearing?
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  #55  
Old 07-11-2010, 11:10 AM
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Quote:
Originally Posted by thayer View Post
It was an ebay compressor. I was completely satisfied with its compressing of the 134a.

We couldn't get a good seal on it to charge it with the 12. I needed ac and so we scrammed over to the parts house to get one that we knew would seal.

If the AC guy I had last summer do my ac didn't do a proper flush, that compressor might actually have some life left in it. (meaning that the gunk we found in the lines was from the previous compressor and not the one currently in his hands) We would just need to make it seal (which we couldn't do in the time allotted).

finally got the money shot of the burst main seal on the current compressor.

I feel like a just took out an attractive, but not overly attractive girl to a chick flick and then to a very nice restaurant, listened to all her stories, laughed when I was supposed to, held the door, complimented interesting things about her, perfect gentlemen, only to find out she is a co dependent basket case. (As I read that, that could also be an analogy for the whole &#%$%*@ car)

It's pointed towards the belt assembly so its not a photographer's dream but it shows the damage.
Maybe I'm slow. By "main seal" you mean the front shaft seal? Or the rear seals where the manifold bolts up?

If you mean the rear seals, you can get them replaced, parts are only a few bucks.

Mine were leaking - it was obvious because of the bright green oil right there on the compressor. Upon disassembly, I could see the rubber was torn. AutoZone gave me the "Huh? Nope, not in our computer..." response.

Sorry about the autofocus on the old pic.
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dissembling R4 compressor-o-rings.jpg   dissembling R4 compressor-compressor-seal.jpg  
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  #56  
Old 07-11-2010, 11:11 AM
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yup, looks like my X is on the bottom. Meaning that it is the lowest point when mounted on a mercedes. It would have been on top when mounted on a gm.

hmm.

Please excuse my blatant disregard for vocabulary. I call it the main seal b/c it looks like it seals the back of the whole compressor to the front of the whole compressor. I need to go and wikki "how does a compressor work" before I got spouting random vocabulary.
Attached Thumbnails
dissembling R4 compressor-imag0137.jpg  
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77' 300D, "Cartman" SOLD @ 150K (didn't know what I had)
83' 300SD, "The Superdon" 325k+ @ 28mpg
95 E320 wagon, "Millennium Falcon" 231k+ @ 24 Mpg
95 E300D, "Sherley" 308k @ 33.69 Mpg, currently anticipating a head
99 Suzuki Intruder "Trudy" @ 45 mpg
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  #57  
Old 07-13-2010, 09:00 AM
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I spoke to Compressor Works tech support again yesterday. Their R4 has a double lip seal design that has a 10 x less leak rate than the old Delco R4's before the 80's. The new double lip seal design does not need and does not have an oil hole and therefore does not have a mark. on the cover. It is lubricated entirely by the freon/oil mist. If the compressor is a reman old R4, I guess it is possible the oil hole orientation may not have been observed during the rebuilt process.

Layback, the oil hole leads to a cavity which feeds both the bearing and the seal.
There are 2 seals actually. The white thing I called a spacer earlier is a ceramic seal which does not contact the shaft but rather butts against the spring loaded inner seal. The Compressor Works R4 does not use a ceramic seal and has just a double lip seal.

I am not sure if that's rust or corrosion or just discoloration. I'll take another look when I get time. That compressor is pretty dry inside and good only for disection. I am going to grind the casing off so I can look inside and that's as far as I'll go on that R4.
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  #58  
Old 07-13-2010, 02:52 PM
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Thought I would chime in on this....even if the post is a bit late in the game.

I worked for a Pontiac dealership in the early 1980s and we had all the tools to rebuild the R-4 and A-6 compressors. Back then, we rebuilt everything.

To that end, I have never seen an R-4 that wasn't so badly worn that it needed to be replaced.

On the other hand, I've never seen an A-6 compressor that couldn't be simply resealed and reassembled.

My advice would be a quality replacement, hopefully one not made in China....Robert
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  #59  
Old 07-13-2010, 03:04 PM
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Doc Bert, thanks for your input. I am doing all this for learning purposes. THe one I am disassembling is not the one going into the car. I have another R4 that is good. I will do a bench pressure and vacuum test on it before installation.

I may as well replace the ceramic/carbon seal with a double lip seal that has lower leak rate:

http://www.ackits.com/merchant.mvc?Screen=PROD&Store_Code=01&Product_Code=21-34734&Category_Code=

Not sure if this is the correct seal. Would you know Doc?
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  #60  
Old 07-13-2010, 03:20 PM
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or is it this one?

https://www.ackits.com/pc/21-34659/shaftandgaskets/21-34659+-+SHAFT+SEAL+KIT+V5+HR6+HT6+DOUBLE+LIP+SEAL

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