Hydraulic system seals

[PeterBergin at aol.com]

When I did it, I ground the corners off a 1 inch drag link socket and put  
it on my hammer type impact, usually they come loose with one or to firm  
strikes.  Very easy!
Pete
 
 
In a message dated 12/29/2011 1:17:07 P.M. Central Standard Time,  
b.benz at charter.net writes:

If  coming from underneath is most probably coming from one of the   
cylinder heads. Just replace the  O-ring sealing the leaking  cylinder  
head. Or remove and replace O-rings under all 8, 2 in the  front row  
for the PB and 6 in the second row for the PS. No need to  open the  
pump any further.

These heads are needlessly very  tight if not previously removed.  
Bentley says to use a drag link  socket driver, but easier with a  
small cold chisel tapping around in  the CCW direction to break it loose.

When replacing no need to tighten  any more than with a big screw  
driver, won’t seal any better. ZF  used the wrong O-ring, why all the  
sealing problems. Must seal on  the ID of the housing bore, not on the  
OD of the head. use a generic  2-018 O-ring, available from any  
bearing or seal  shop.

Bernie


On Dec 29, 2011, at 9:59 AM, SAJanesick -  Bellsouth wrote:

> Bernie,
>
> Thanks for the info on  the Nitrile.
>
> The pump has a substantial leak, about a drop a  second while  
> running at idle, from underneath and not from the  hose fittings.  I  
> lose about 3 ounces a day just in  running around town so something  
> must be fixed.  Green  blood is too pricy to waste.
>
> I considered rebuilding it  myself, but didn't really have a way to  
> bench test it to 2100  psi.  I figure let someone with more tools  
> and expertise  at it.
>
>                 - Steve
>
>
> ----- Original Message ----- From: "Bernie  Benz" <b.benz at charter.net>
> To:  <PeterBergin at aol.com>
> Cc: <sajanesick at bellsouth.net>;  <200q20v at audifans.com>
> Sent: Thursday, December 29, 2011 11:34  AM
> Subject: Re: Hydraulic system seals
>
>
> 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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