968s sucking oil into engine somehow??? - 986 Forum - The Community for Porsche Boxster & Cayman Owners

piersman · 05-04-2014, 10:59 AM

Does anyone have a picture or diagram of the internals of the AOS , I'd like to know what's in there.

If I end up buying another AOS I'll strip this one down to see what's going on inside, but it would be good to know what should be in there and how it's supposed to work.

Cheers.

Frank A · 05-09-2014, 01:34 PM

I have a 2000 Boxster S that smoked just like yours when I bought it.
If I took a spirited left hand turn the oil smoke was amazing.
I changes the AOS, cleaned the intakes, and still clouds of oil.
While I was changing my IMSB I noticed my pass side oil pump was installed wrong ( Keyed to 2-6 not 1-3) so it was not evacuating the head of oil.
My motor has over 120,000 miles so I'm sure the valve guides are hard and leak, but from the time I keyed the pump proper no more clouds of smoke.

Good luck

Jake Raby · 05-09-2014, 02:28 PM

Yes, a backward installed scavenge pump will certainly cause this.

healthservices · 05-10-2014, 03:32 PM

Quote:

Originally Posted by piersman

Does anyone have a picture or diagram of the internals of the AOS , I'd like to know what's in there.

If I end up buying another AOS I'll strip this one down to see what's going on inside, but it would be good to know what should be in there and how it's supposed to work.

Cheers.

I think someone cut one open, basically just a baffle. Maybe when I have time I'll cut one of the ones I have open....

Sent from my SAMSUNG-SGH-I317 using Tapatalk

kiyakubuke · 05-13-2014, 08:17 AM

So my 2001 S is having identical issues. first noticed it at the track doing some 0-60 times. on the second run just as I hit 60 a big puff of smoke came out the exhaust. I thought I had blown the engine, but it ran fine. on the way home it smoked a little on hard acceleration (getting on the interstate) but ran perfectly. of course I took it really easy all the way home. noticed it did it the next day on startup but not on the following days. seems now that if I drive it a little hard, it may not smoke then, but on startup the next day it will. had it do it once more on the interstate passing some cars.

so, of course I have been researching this and talking to some folks. I have a friend that has had several Boxsters and talked to some guys at the Porsche driving school at Barber Motorsports Park in Birmingham. most of them were like, "yeah, they do that." most of them have upgraded their AOS with the "High Performance" version to prevent this issue on the track.
Still, "some dudes at the track" are not, in my mind, the final word. I plan to have the car checked out completely, but at least I am not in a panic anymore....for now.

kiyakubuke · 05-13-2014, 11:10 AM

I think mine is falling into the AOS failure category
Replace the Air/Oil Separator

kiyakubuke · 05-14-2014, 04:14 PM

so I just had my car checked out by the dealer and by a local repair shop specializing in European cars. they both confirmed that it was indeed the AOS. the dealer quote has been blocked from my memory for my own sanity, the repair shop quoted me $700. another $375 to replace the spark plugs. I can only assume a BJ was included in that price. regardless, I opted to get the part from Pelican for $132.75 and a set of plugs for $36 and will fix it the weekend.
Next weekend, I will spend the $800 I saved doing it myself.