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Ckipam
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In case someone reads this, I think I found the cause of the oil leak. The seal should only be inserted to a specific depth in the recess it goes in. I only discovered this because I decided to take the whole cover off (that exposes the differential) to make sure the seal goes in properly, and I noticed there is a slot in the side of the recess that circulates oil (I think) which made me think the seal should not go beyond the edge of the slot (or channel). It is only 2 or 3mm. I guess Porsche have a special tool that inserts the seal to the exact depth. Otherwise it would not be possible to know exactly how far the seal has gone in unless you look from the back of the cover. I am not 100℅ sure about this but so far I have no leak!! I had to do it 3 times before I realised this. First I tapped in the seal as far as it would go to the plates at the back. It leaked straightaway. Now it's dry. Also I think the circlips at the end of the half shaft is meant to be renewed every time. It's not really a standard circlips, more a piece of semicircle shaped round bar that snaps in the grove in the shaft. I guess it deformas when the shaft is pulled and so won't hold the shaft in place if reused because by then it is already too small. It might be possible to reshape the old one but I just renewed it. It wasn't cheap at £15.
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Hi - did you find out what was causing the leak? I have done exactly the same as you and I amust baffled.... bewildered!! I have a leak from the left side (the side that has the transmission cover so the 68.2mm size) so I ordered a seal from Porsche and replaced.... it was leaking!! Couldn't believe it! I thought perhaps I had done something wrong or lost the spring but didn't really think so. So I ordered another seal and just fitted it today. Still leaking after just driving 2 miles. Not overfilled am pretty sure. I am baffled!! And frustrated.... I would be really grateful for any help. Thanks