I'm going to attempt to DIY my AOS as soon as I can get around to it, so I'm ordering parts. Now from the DIY articles really all I need is the actual AOS. I have a friend at the dealership that put in the order for me and after taking my VIN he sent me a picture and asked, which one do you need?
Well, I don't know...
Help? I have a 2002 C2




Thanks in advance.

 

The one on the left, the one that gets talked about all the time.

 

Also check out my DIY for reference if you run into problems

https://rennlist.com/forums/996-foru...i-aos-diy.html

 

What Ahsai said ^^^^
And when you do it, you should order new intake o-rings and a TB o-ring as well since all that has to come out. Stand by to replace the "little plastic coolant" connector by the alternator as well. Replace that with a brass hose fitting and ss worm clamps.

Be sure to read up on this project....it's a bear. The other oil separators (on the right) are located in the oil sump. You will not be going in there.

 

Agreed. Problem is that I won't know what exactly I'll need to replace until I get in there, and this is my DD so gotta get it done in a weekend. Luckily I'll have a little help so hopefully all goes well.

Water pump too eh? Well, maybe I should order that also...

 

After I completed this project I found that my oil filler pipe had split so you might want to add that to the list or you will just have to go back in there. Have every extension (many of them) and swivel joint known to mankind on hand, you will need them all. You will need short ratchets as well. I removed the rear bumper and heat shields so I could lower the engine to the cross member. That gives you a little bit more room but not much. I also found that in loosening the intake bolts, you have to work your left arm down along the engine bay, moving your arm back and forth and there are lots of places that will cut your arm, so I wrapped my entire arm in an ACE bandage and wore mechanic gloves. Pay very close attention to removing the intake bolts...I dropped one (the rearmost) and it took me two days to find it on the engine even with mirrors and flashlights. The intake bolts have thread locker on them so they do not come out easily. Immediately on removing the intake manifold, cover the intake manifold with shop towels so nothing falls down the intake runners. The other thing that helped was 4 LED shop lights jammed back in there so I could see what I was doing, although most was done by feel. I used painters tape to hold the rearmost intake bolt to a socket and to the intake manifold, worked it back in there by feel, and came across the top of the manifold with several extensions and swivel joints. Once you have the intake manifold out, loosen the AOS bolts from underneath, remove the bellows clamp from underneath and pull the whole thing out across the top of the engine. That makes getting the AOS hoses off easier. I replaced the spring clamp on the AOS bellows with a ss worm clamp. This is one tricky job with the engine in the car. Have Advil and beer at standby...you will need it.

 

Ok. I guess I'm still on the fence about this one, I did take off the oil filler cap off while engine was running. Was quite easy to remove, not a problem at all, and the engine revved slightly higher but I wouldn't say it ran rough by any means. I'm wondering if this is a thing that I shouldn't touch if it isn't exhibiting problems. The reason why I decided I wanted to look into replacing the AOS in the first place was because I have seen white puffs of smoke occasionally on start up. And I have a bit of oil mist on the back of my car, with a VERY slight unexplained coolant loss. I wouldn't want to go through all the trouble if not absolutely necessary.

 

I did not want to discourage you but also did not want you to underestimate this project. The white puffs of smoke, oil mist and unexplained coolant loss all point to the AOS. Mine started leaking coolant to the point where there was a constant small pool of coolant under the car in the garage after a run. After getting it all apart, there was quite a bit of oil film in the intake manifold as well, but I never saw white puffs of smoke. The AOS diaphragm casing had split open resulting in the coolant drip down the backside of the engine. If you are anywhere plus of 60-70,000 miles you probably are due. It is doable with the engine in the car and there are many good write ups on how to do it. That being said, the next time I have to do this I will be dropping the engine completely. And at that point, a lot of other stuff will be getting done/replaced as well. Mine is a 99 C2, DD, with 133,000+ miles. The offender:

 

Thanks DBJoe you've been very helpful. I will get that ordered then!

 

DBJoe,
Great suggestions and comments. Thanks for taking the time to share.
So many AOS threads, yet no major, affordable solution to the diaphragm problem yet.

 

Can you help me with the part numbers for these? I did some searching but I'm not sure which are the right ones. Unfortunately I'll be doing this on the weekend so the dealership won't be open for parts if I need them. I haven't gone in there myself yet so I can't tell which ones are the ones I'll be needing.

 

Can't help you with the part #'s but if you order from Suncoast, Pelican or some other place explain to them what you are doing and tell them you want an o-ring this and a o-ring for that. I have been on the phone with Suncoast before and they email me a parts diagram so we can both be sure we agree with the part in question. Actually works out pretty good.

 

Your friend at the dealership should be able to get the right parts for you based on your VIN.

The AOS you need is #1 here 99610702651
http://www.autoatlanta.com/porsche-p...section=104-10

The gasket is #2 here 99711024700 and you need 3.
http://www.autoatlanta.com/porsche-p...section=107-10

You may as well replace #13 here 99951265009 and you need 3 (one is between part 12/17). Note this is a 997 part but they are identical to your stock spring clamps. For 996s, they've changed these to the worm-screw type, which I dislike. Just be very careful removing the spring clamps as they tend to slip and fly around. You will never find them if they do. Worse, they may fall into the intake holes or AOS engine hole if you don't cover those well.
http://www.autoatlanta.com/porsche-p...section=104-10