[928uk] 87 S4 auto

[Vince Dallimore]

George, 
You’ve explained the pipe and nipple and just possibly my atf leak that has been there for years. Now to fit new seals on the top up cap and connection pipe, plus new nut and see if I can scrape some knuckles checking that tiny pipe! 
Regards, 

Vince Dallimore 
M: +44(0)7798 630649

Sent from my mobile

87 S4 auto; 88 S4 manual; 86 S2 (barn find) 

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> On 11 Jun 2019, at 16:40, George Layton <George.Layton at ukgateway.net> wrote:
> 
> Below is a copy of an email I sent to the list back in 2004 which I think is relevant here - And agrees with what Duncan has said.
>  
> I believe the small pipe is to direct atf from some part of the gearbox back into the reservoir - I still to this day do not understand exactly why this pipe is necessary, given the many fluid pathways which already exist inside the transmission body.
>  
> George.
>  
> Reproduced post starts here ****
>  
> For some months I have been trying to trace a leak of ATF from the rear of my auto transmission.  As well as spending several uncomfortable hours laying under the rear of the car I had it up on a lift a couple of times to check/fill the reservoir, but when I put more fluid in the leak got worse. With the engine idling and the transmission in neutral there was no leak at all, but after driving a few miles on the road there was fluid dripping from the bottom of the rear crossmember.
> 
> By cleaning everything, driving the car and then checking underneath again I narrowed the source down to the area around the reservoir but could not pin it down exactly.  A very large bill for removing the transmission to repair a gasket was a worrying possibility :^(
> 
> Following advice from Adrian at Beaulieu I got the car up on a lift again and with the aid of a small mirror on a long handle and a torch I checked everywhere above and around the reservoir.  Sure enough, as Adrian had said, there was a small black pipe above the reservoir
> hanging in the air - and on the top of the reservoir was the small plastic spigot to which it SHOULD HAVE been attached. An interesting point here is that the pipe and the attachment point on top of the reservoir are not shown on the Porsche PET - I had checked before when
> looking for possible causes.
> 
> Fitting the pipe on the spigot was (again as Adrian had warned me) a bugger to do, but after much swearing and knuckle grazing the job was done.
> 
> Result ???  The reservoir is filled to the correct level and after a week of driving, including some high speed motorway runs, no leak at all :^)
> 
> So, many thanks to Adrain, a valuable source of knowledge indeed !!
> 
> George.
> One little pipe, one large PITA
> 
>  
> ----- Original Message -----
> From: Vince Dallimore
> To: Duncan Fuller
> Cc: Sharkmaster ; Paul Lacey ; 928 List ; Paul Lacey
> Sent: Tuesday, June 11, 2019 12:58 PM
> Subject: Re: [928uk] 87 S4 auto
> 
> Duncan, 
> That is a correct description, doesn’t show on parts list or in wsm, maybe like the flip wing, the nipple only appeared on the earliest S4s? 
> Regards, 
> 
> Vince Dallimore 
> M: +44(0)7798 630649
> 
> Sent from my mobile
> 
> 87 S4 auto; 88 S4 manual; 86 S2 (barn find) 
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