Oh, and make darn sure your compressor O-rings and front seal aren't leaking. Nothing worse than going through the motions of fixing all that junk only to find the O-rings on the cylinder sleeve and/or the front seal is leaking.
This is a VERY common problem with R4 compressors. Especially NOS or original GM ones. The o-rings just get old and start leaking. They're Buna-N, or NBR from the factory and really only made for R12 applications.
My recommendations:
You NEED a double lip seal on these R4s. Why they didn't put them in I'll never know. They only have a single lip seal or early models used a mechanical seal.
The set of body O-rings is Santech MT2119- Autozone sells these for about 9 bucks. They're the green HBNR type, which are better than the original rings and compatible with 134a or similar.
Double Lip Shaft seal- Santech SK-741N
Seal protector thimble is Mastercool 90484. If anyone attempts a seal replacement, you MUST use the protector. Kent Moore has a similar deal that GM techs used. No need for that. Too expensive normally.
This is a VERY common problem with R4 compressors. Especially NOS or original GM ones. The o-rings just get old and start leaking. They're Buna-N, or NBR from the factory and really only made for R12 applications.
My recommendations:
You NEED a double lip seal on these R4s. Why they didn't put them in I'll never know. They only have a single lip seal or early models used a mechanical seal.
The set of body O-rings is Santech MT2119- Autozone sells these for about 9 bucks. They're the green HBNR type, which are better than the original rings and compatible with 134a or similar.
Double Lip Shaft seal- Santech SK-741N
![www.ebay.com](https://cdn-0.gbodyforum.com/proxy.php?image=https%3A%2F%2Fi.ebayimg.com%2Fimages%2Fg%2FxEAAAOSwZ1tkp5ji%2Fs-l400.jpg&hash=7376cccd1f8d14fed88da226636432ff&return_error=1)
AC GM Compressor Lip Shaft Seal R4 V5 HD6 HR6 HR6HE DA6 HT6 A/C DOUBLE LIP 14MM | eBay
THIS 14mm DOUBLE LIP SHAFT SEAL KIT is considered an UPGRADE to the standard Single Lip Seal. only 1 14mm shaft seal kit. For 14mm Standard Shaft Size. can be used in A6 compressors and in early model R4 compressors replacing the regular "2 piece" type carbon seal.
www.ebay.com
Seal protector thimble is Mastercool 90484. If anyone attempts a seal replacement, you MUST use the protector. Kent Moore has a similar deal that GM techs used. No need for that. Too expensive normally.
![www.ebay.com](https://cdn-0.gbodyforum.com/proxy.php?image=https%3A%2F%2Fi.ebayimg.com%2Fimages%2Fg%2FMPwAAOSwLdlmfexk%2Fs-l400.jpg&hash=dfe5844c9b9c52e115f3fa82d52c5c08&return_error=1)
mastercool inc, 90484, gm seal protector. | eBay
Find many great new & used options and get the best deals for mastercool inc, 90484, gm seal protector. at the best online prices at eBay! Free shipping for many products!
www.ebay.com