Question for the R4 compressor experts - PeachParts Mercedes-Benz Forum

otto huber · #1 02-26-2016, 05:41 PM

Here's a picture from the bottom of the compressor. If there's any way that I could cross reference those numbers with specific GM automobiles, I might get somewhere. My buddy from the GM dealership mailed me a couple of washers yesterday, so maybe I'll get lucky.

funola · #2 02-26-2016, 06:54 PM

Don't know if these pics helps. I took them before taking apart my parts compressors to get the outer band to make a R4 press and also for future identification if there is a a future need before throwing the guts out.

Don't know if it means anything but the Delphi has the same SAE number as your Harrison.

otto huber · #3 02-26-2016, 07:46 PM

[QUOTE=funola;3574592]Don't know if these pics helps. I took them before taking apart my parts compressors to get the outer band to make a R4 press and also for future identification if there is a a future need before throwing the guts out.

Don't know if it means anything but the Delphi has the same SAE number as your Harrison.

Thanks for the pics. I guess that the SAE # has nothing to do with sealing washer size, because my old compressor was also a Delphi with the same port sizes as the one you posted. I misstated the brand of the old compressor in my first post, I thought that it was Behr.

Fortunately, it looks like I found the washer that I need. The O'reilly's near me has a good store manager, and he opened up some kits for me and found a black washer with the same inner and outer diameter as the red washer but thinner. The black washer fits into both ports. I'm waiting on a new drier, so I'm hoping to have everything sealed up by the end of next week and get a leak test in mid March.

funola · #4 06-23-2016, 10:27 AM

[QUOTE=otto huber;3574603]

Quote:

Originally Posted by funola

Don't know if these pics helps. I took them before taking apart my parts compressors to get the outer band to make a R4 press and also for future identification if there is a a future need before throwing the guts out.

Don't know if it means anything but the Delphi has the same SAE number as your Harrison.

Thanks for the pics. I guess that the SAE # has nothing to do with sealing washer size, because my old compressor was also a Delphi with the same port sizes as the one you posted. I misstated the brand of the old compressor in my first post, I thought that it was Behr.

Fortunately, it looks like I found the washer that I need. The O'reilly's near me has a good store manager, and he opened up some kits for me and found a black washer with the same inner and outer diameter as the red washer but thinner. The black washer fits into both ports. I'm waiting on a new drier, so I'm hoping to have everything sealed up by the end of next week and get a leak test in mid March.

How did the R4 work out? I see in your first post you bought a shaft seal kit. Did you take apart the R4 and do a full re-seal? It is not hard if you have the tool to press out the casing. I made a tool out of an old R4 in a couple of hours and tested it- Looks 3rd world but works great! I plan on re-sealing the R4 in my 85 300D, renew all o-rings on the fittings, flush system, replace TXV and dryer, pressure test and refill with R12. I have a full 30 lb jug of R12 sitting around waiting to be put to use. I currently is testing R152a DustOff and it is cooling great. I will continue testing the R152a well into Aug- Sept when it will be much hotter and then go back to R12 in Sept when it is still hot. Meanwhile have to gather/order parts.

Couple of good videos on R4 resealing:
https://www.youtube.com/watch?v=vImsu-D_Qnk

https://www.youtube.com/watch?v=1zZyeEgDdyY

seal kits:

GM R4 AC Compressor Gasket Shaft Seal Kit Green HNBR Metal Shaft Seal Tool | eBay

GM R4 A C Compressor Reseal Kit with Shaft Seal O Rings and Seal Install Tool | eBay

otto huber · #5 06-23-2016, 11:38 AM

The Harrison R4 has worked well and the two sealing washers that I found for the back of the compressor seem to be doing the job. I drove the car down to Southern California last weekend and was able to get vent temps down to 39* with 85* ambient temp.

ROLLGUY · #6 06-23-2016, 05:42 PM

Quote:

Originally Posted by otto huber

The Harrison R4 has worked well and the two sealing washers that I found for the back of the compressor seem to be doing the job. I drove the car down to Southern California last weekend and was able to get vent temps down to 39* with 85* ambient temp.

You should have stopped by to say hi!

otto huber · #7 06-23-2016, 07:41 PM

Quote:

Originally Posted by ROLLGUY

You should have stopped by to say hi!

Where exactly are you located? My girlfriend and I were down near Pismo beach for just one evening, so not much time to make visits, but maybe you were at the classic car show that weekend.