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I have had my PSD rebuilt by Harold - it has needed a lot of work, so i suspect the PSD has not worked for many years. I suspect I also need to remove and rebuild the slave cylinder. Is it possible to remove the slave cylinder without dropping the diff or removing the fuel tank? I can't find the procedure for doing this, is there one on Rennlist etc?
I have had my PSD rebuilt by Harold - it has needed a lot of work, so i suspect the PSD has not worked for many years. I suspect I also need to remove and rebuild the slave cylinder. Is it possible to remove the slave cylinder without dropping the diff or removing the fuel tank? I can't find the procedure for doing this, is there one on Rennlist etc?
A bit challenging to get to, but two bolts and one hydralic line will get the slave onto the ground.
The "problems" generally start after this...
Here's a picture of the cylinder location. The only thing that's in the way is the half-shaft, but you can feel your way around it. My $.02, due to PSD pressure, always wear safety glasses, and also remember brake fluid can do a number on paint.
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Does it have the "Do It Yourself" manual transmission, or the superior "Fully Equipped by Porsche" Automatic Transmission? George Layton March 2014
928 Owners are ".....a secret sect of quietly assured Porsche pragmatists who in near anonymity appreciate the prodigious, easy going prowess of the 928."
I think there are 2 main differences between the diff in your photo and my car:
1) mine has 30 years of muck and corrosion that i haven't cleaned off yet
2) the slave on your car appears to be on the side of the diff, next to the drive shaft. On my car, it appears to be on the top of the diff (i think my 1990 was an early use of the PSD and perhaps the slave moved in later cars?). In both cases, the drive shaft needs to be removed, so maybe once i have done that, i am able to get enough access. Those drive shaft bolts are not keen to come off at the moment.
All slave locations are in the same, for all models, all years, and all countries...passenger (right side) directly above the axle.
Lowering the axle may make access easier, but is not necessary.
BTW.
It is impossible to rebuild a PSD and not set-up the correct dimension for the lower PSD release arm with a very special (and expensive) tool only available from Porsche. (Which requires removal of the slave.) Failure to do this almost guarantees improper operation of the PSD differential.
Is this what you are attempting to do?
Last edited by GregBBRD; Nov 28, 2022 at 12:46 AM.
I suspect you already know the answer.
This is not something i knew about.
What i want to do in the short term is fit the rebuilt PSD back into the corner of the car, so that i no longer get the warning on the dash - i need to do this, so i can pass the UK MOT test, to get the car on the road (it fails the MOT if there are any messages, regardless of severity).
Ideally, I do this in such a way that it doesn't operate the slave for the moment, and i can revisit this once i have more time.
Do you think there a safe way to do this without damaging the PSD?
^^^ Not sure about your make/year, but on mine, if the PSD is unplugged (two plugs on the unit), you shouldn't receive any warnings..That's the way my GTS was when I bought it.
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PSD SLAVE CYLINDER
George Layton March 2014
