Hydraulic system seals

[Bernie Benz]

Your nitrile O-ring is just fine.
Don’t have your pump rebuilt unless something is wrong with it. DFWAB!
Careful with Audi rebuild kits, they use the wrong O-ring for the  
cylinder heads.

Bernie

On Dec 29, 2011, at 8:14 AM, PeterBergin at aol.com wrote:

> I have rebuilt my pump on my old 200 twice.  Bought a seal kit (cheep)
> from SJM)  did not do the shaft seal behind the pulley.  Need to  
> get a  drive
> link socket and an impact wrench to get out the round plugs from  
> the  pump.
> Kit is just a bunch of O-rings and seals. Not a hard job, less   
> than 2 hours
> the first time.
>
> Pete
>
>
> In a message dated 12/29/2011 10:01:41 A.M. Central Standard Time,
> sajanesick at bellsouth.net writes:
>
> I  recently lost a seal where the high pressure hose attaches to the
> hydraulic  pump.  According to the VagCat board drawings, there  
> appears to be
> different size seals depending on which hose is attached.  I've  
> matched  the
> size, but I am concerned about the O-Ring composition.  The seal  
> that  blew
> out was a reddish orange seal versus the darker brown seal that is  
> used  on
> the hose from the hydraulic reservoir.
>
> Since it was over the  holidays, I just picked up a generic O-Ring
> assortment from Harbor Freight and  indeed found the right size  
> that seems to be
> sealing with no apparent  leaks.  The O-Rings are black and package  
> states that
> they are made  of  Nitrile and resistant to oil, grease, etc.
>
> Does anyone have  any experience of using black Nitrile O-Rings  
> within the
> hydraulic hoses  fittings?  I've been told that Audi often uses very
> specific O-Rings of  different color and material for different  
> applications.  I
> have not gone  to the dealer yet, but I could still get by there  
> today or
> tomorrow.  In  the meantime, I travel with wrenches, O-Ring  
> assortment, towels
> and as much  Chf11s as I can get my hands on - just in case.
>
> Also, I'm looking at  having the hydraulic pump rebuilt by LARES
> http://www.larescorp.com/index.html  up in Minnesota.  From what I  
> can tell, they look
> like they know what  they are doing, but I thought I'd check to  
> see  if
> anyone has any prior  experience with them.
>
> Thanks,
>
> - Steve Janesick
> sajanesick at bellsouth.net
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