[T3] When I change the auto trans diff oil?

[William J]

 Thank you Jim :

 Yes I really have no idea If the engine was original yet it is an X version 
.
When I got the car I had rich running issues and I removed all the tin and 
cleaned everything including the oil cooler and flushed the case out and 
replaced all FI seals and fuel lines and vacuum lines and cleaned as much 
under the engine and trans I could get off with a air nozzle that sucked up 
mineral spirits spraying under presssure.

 I only found the ground strap and 2 trans mount nuts missing and also 
checked  everything else tight . Since then I had the engine out in 97 to 
rebuild the 72 auto trans case I had and in 2002 I did the auto trans. Since 
2002 to date all I found was one torque converter to flex plate bolt 
slightly loose.

 Since there is really no way to tell by engine number if it was the 
original .

 The Pinion seal suffice to say is something  from what I've read some 
dealer service bulletin put out in the late 80's or 90's can't recall . It 
relates to the idea that if the pinion seal seated in the diff between the 
and auto trans goes trans fluid enters the diff and thins out the diff oil 
and shortly kills the ring and pinion . To see this seal the auto trans has 
to be removed from the diff..  .

William


----- Original Message ----- 
From: "Jim Adney" <jadney at vwtype3.org>
To: <type3 at vwtype3.org>
Sent: Tuesday, March 01, 2016 10:13 PM
Subject: Re: [T3] When I change the auto trans diff oil?


> On 1 Mar 2016 at 15:37, William J wrote:
>
>> The thing that really bugs me is when I had the trans out in 2002 I
>> had no idea this seal was a concern or I would have replaced it then.
>
> The idea that this seal is a common wearout item comes as a surprise
> to me. I believe there is a comment in the AT section of the Bentley
> about early ATs having that seal installed in one direction but that
> it should be turned around if the AT is rebuilt.
>
> I have 3 AT Type 3s and that seal hasn't been touched on any of them.
> Nor have I ever seen a problem with that seal. In your case, my guess
> is that your engine and tranny was pulled for some reason and not
> installed very carefully. It's quite possible that neither is
> original to your car. Nevertheless, my greatest concern would be
> about what else the previous mechanic did poorly.
>
> Yes, change all the fluids: ATF, gear oil, engine oil, and brake
> fluid. Check the bolts that hold the torque converter to the drive
> plate. Check the bolts that hold the engine to the AT and the rear
> mount crossbar bolts. Check the CV joint bolts. Check the caliper
> hoses for unusual twists and check the caliper attaching bolts. Check
> the master cylinder bolts. Check the pedal cluster bolts. Check the
> rubber mounts for the FI fuel pump.
>
> Look for tracks where this person has been before, and double check
> his work.
>
> -- 
> *******************************
> Jim Adney, jadney at vwtype3.org
> Madison, Wisconsin, USA
> *******************************
>
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