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steve r
Monza


Joined: 26 Sep 2011
Posts: 191



PostPosted: Tue Oct 23, 2018 11:41 am    Post subject: Air-Con purple o-ring lube? Reply with quote

Hi,

Does anyone know the correct lube to use on the purple o-rings in the air-con system? I believe they are made from Hydrogenated Nitrile Butadiene Rubber (HNBR)

Thanks

Steve
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infrasilver
Fast & Furious
Fast & Furious


Joined: 04 Oct 2010
Posts: 7865
Location: East Midlands

2001 Porsche 996 Targa

PostPosted: Tue Oct 23, 2018 12:33 pm    Post subject: Reply with quote

I use the same type for all my O rings when assembling for the engine and AC pipes, I'm not sure if it's the correct type of lube for the AC rings but it is a protection lube to protect against oil and other corrosive chemicals and stops the O ring degrading, it also helps assembly. Its O Ring Silicone Grease and a little goes a long way.
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toohey
Monza


Joined: 22 Jan 2009
Posts: 177
Location: Naarfolk


PostPosted: Tue Oct 23, 2018 1:45 pm    Post subject: Reply with quote

When i changed the A/C condensers on my car, my indy gave me a small amount of Aircon system oil to put on the seals so that i didn't install them dry...... he's a top bloke like that -plus he knew that as the guy regassing it, it would reduce the chance of leaks from a a damaged seal!

Toohey
 
  
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deMort
Zolder


Joined: 21 Mar 2015
Posts: 5341
Location: Brighton


PostPosted: Tue Oct 23, 2018 6:41 pm    Post subject: Reply with quote

At work i just use some of the a/c oil .. Pag 45 i belive .. there is a special oil you can use but for me all i need is lub so it doesnt catch when installing.

The seals are designed to swell up with a/c oil so you lub and fit .. thats also why its best not to reuse old seals.

green or purple .. its all the same.
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steve r
Monza


Joined: 26 Sep 2011
Posts: 191



PostPosted: Wed Oct 24, 2018 11:20 am    Post subject: Reply with quote

Thanks, I’ve ordered some PAG 46.

The joint forward of the rear right wheel was leaking. There was corrosion in the aluminium fitting which I think was pushing the fitting open a little. All cleaned up so hopefully will seat correctly and not leak.
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deMort
Zolder


Joined: 21 Mar 2015
Posts: 5341
Location: Brighton


PostPosted: Wed Oct 24, 2018 7:28 pm    Post subject: Reply with quote

As long as there is no corrosion where the seal sits then it will be fine .
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MisterCorn
Long Beach


Joined: 08 Jan 2011
Posts: 6249
Location: Nottingham, England

2004 Porsche 996 Turbo

PostPosted: Wed Oct 24, 2018 7:35 pm    Post subject: Reply with quote

steve r wrote:
Thanks, I’ve ordered some PAG 46.

The joint forward of the rear right wheel was leaking. There was corrosion in the aluminium fitting which I think was pushing the fitting open a little. All cleaned up so hopefully will seat correctly and not leak.


I had this on my 996 C2. One of the bolts was an absolute pain to remove. Cleaned up, new o-rings and bolted back together. Still got ice-cold air con 2 years later.

MC
 
  
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steve r
Monza


Joined: 26 Sep 2011
Posts: 191



PostPosted: Wed Oct 24, 2018 8:28 pm    Post subject: Reply with quote

deMort wrote:
As long as there is no corrosion where the seal sits then it will be fine .


Yep, the area where the seal sits looked fine.

MisterCorn wrote:
I had this on my 996 C2. One of the bolts was an absolute pain to remove. Cleaned up, new o-rings and bolted back together. Still got ice-cold air con 2 years later.

MC


Good to know, thanks. Mine was leaking from the larger pipe, the bolt for the smaller pipe looked very hard to get onto due to its proximity to the body so I left that one alone.

Anyone know the sizes of the O-Rings? I bought mine from Porsche which wasn't cheap but whilst searching for o-ring lube found selection boxes of the purple & green ones for less money......
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