YAHOO...finally did it....

Hello folks... Yes folks i finally did the AOS....I just took it off first changed the AOS and cleaned all the other parts. While i was there, i took off the starter and will have it rebuilt.Not expensive and worth it....I will do the same with the alternator. Just to be sure i will, by the same time ,changed all the o'ring and gaskets (throttle body , intake and one or two hoses))really not expensive and also worth it for sure. Doing the AOS was a lot easier then i thought at first. I just took off the alternator and i can easily reach the 6th bolt with my 2 hands. Once this bolt is off the rest of the work is just a matter of 20 minutes. So folks if you ever plan to do your AOS by yourself, go ahead you will save a lot of money and at the end you will be proud of yourself. You will just need a couple of tool and that's it. Good luck Robert 2000 C4 911

Nice work, hope it runs better. Next time stuff some clean rags in those intakes to avoid a big oops.

Nice job. Kind of a noob ques. But is the engine in or out?

I did all the work with the engine in.... And you are right Logray i will use clean rags Thanks Robert 2000 C4 911

You must be satisfied with a new AOS, hoses etc. Nice going.

Well done. I love it when posters show video or progressive photos of their work. I will keep this in case I ever need to change mine. You are correct in saying that it makes one feel so proud to do DIY work on ones Porsche. I know that feeling well. Plus we know for sure that the work has been carried out correctly. One daft question, why did you have to change the air oil seperator in the first place?

Well done. Is your car a tip or manual? I am going to do my AOS, but I have been told that with the tip, the engine has to be dropped. My car is also a 2000 C4. Has anyone on Rlist done an AOS on a tip car?

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On a tip, if you do it from the top like OP, it should be very similar if not the same. If you're going to do it from the bottom. You have to drop the tranny. It's just too big.

Hello... While i was on the process or clearing the engine i discovered a big poudle or oil just beside the oil filler tube. One of the bolt was completely out so the oil filler tube was leaking and probably for this reason the engine was always smelling burning oil after a ride. I decided to change th� AOS simply because i found oil all around the AOS and on the throttle body.i was also looking and searching for the oil smell.sure i finaly found the problem. Some more pics will follow in a few days. Bye bye folks

I'm a newbie about these AOS units - what exactly does it do? I read "somewhere" that it is a poor design compared to other cars - I don't know if that is true or not so that's why I am asking. When I had my IMSR kit installed, I had the AOS replaced as well. I am just curious about it's purpose and what it does. Are there any merits to the claim I heard that it is a poor design? Thanks

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The Engine oil air separator directly affects the engine crankcase atmosphere because basically all Porsches from 1980 on including the current 986-987-996-997-Caymen & Cayenne engines all are positive crankcase type systems meaning the engine crankcase has vacuum supplied from the intake manifold to collect and burn the residual combustion by-products or blow-by in the crankcase by running it through the engine again, basically to lower the overall vehicle emissions. On most occasions, when the oil separator fails, intake vacuum in the engine crankcase rises to an unusually high or abnormally high figure and more likely than not ends up drawing engine oil into the intake system usually fouling spark plugs and even possibly causing damage to the oxygen sensors (O2), catalytic convertors and even possibly various other sensitive fuel injection components. Interestingly enough, the only way to test the oil separator is to periodically test the engine crankcase vacuum with a water filled Monometer AKA an ultrasensitive vacuum gauge. On BMW�s and Porsche�s, the engine crankcase vacuum is normally around 4-7� (Inches) of water. When these oil separators fail the crankcase vacuum can rise to 9-12� and even higher depending on the extent of the failure. When the oil separator is starting to fail on Boxsters (986-987), generally you will start to see a substantial amount of smoke from the exhaust tailpipe. When the oil separator finally fails, the engine exhaust smoke can reach dangerous proportions that almost look like it was manufactured from an anti-mosquito smoke machine. Unusually enough, on the 999-997�s, when the oil separator fails, it hardly ever creates any exhaust tailpipe smoke, almost being like a silent killer or costly surprise. On another note, it has been known on rare occasions, that when an oil separator fails that it is possible to have a slightly rich running condition that might turn on the check engine light or CEL. The only way to know what is happening is to check the fuel trim numbers on the OBD-II �Freeze Frame� data and crankcase vacuum to see exactly what�s going on, otherwise your just guessing. This is acopy paste and not my description..