19 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHReplacing Air Oil Separator (AOS)
Leading reported evidence
Install uaos system so i wont have
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that performed work without a confirmed outcome
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Performed · outcome unconfirmed
I installed the uaos system so i wont have to do it again.
Leading evidence: 'Install uaos system so i wont have' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Install uaos system so i wont have' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that performed work without a confirmed outcome
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Performed · outcome unconfirmed
I replaced every coolant hose on my car and every vac part when i did my aos.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that performed work without a confirmed outcome
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Performed · outcome unconfirmed
Your AOS is like ours, and it is different than the one in the Pelican guide, the Porsche parts guide, and the one in the picture of the guy who changed all his hoses.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that performed work without a confirmed outcome
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Performed · outcome unconfirmed
I replaced all the lines last winter because i had a clam failure at the track and the engine bay hoses felt bad.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that contain suggestions
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion · Original poster
This pic is from the Pelican Parts repair instructions.
Discussions that performed work without a confirmed outcome
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Performed · outcome unconfirmed
Your AOS is like ours, and it is different than the one in the Pelican guide, the Porsche parts guide, and the one in the picture of the guy who changed all his hoses.
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion
If a person hadn't removed an intake manifold on a European car or something like replaced a water pump on one, they need to take this job to a professional.
Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.
19 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.
0 acknowledgements have no verified action link; they do not establish a repair result.
Generation: 20261026T105141Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
In prior thread I chased a coolant leak. Looks like AOS is leaking. Not sure of fitting cracked or just a loose hose connection. Ordering new AOS and hoses since I'm doing the job.
Read Pelican Parts instructions on replacement without dropping engine. Thinking of going that way or dropping engine. I have a lift.
2003 C2 with 52k miles. New clutch at 48k and European Parts Solution replacement IMS bearing at 41k. If those haven't been done, I'd definitely drop.
I have all the service records back to 2017. Doesn't look like any coolant hoses ever replaced. Concerned the hoses could be all 18 years old. Don't have a good understanding if there are coolant hoses impossible or hard to get to without an engine drop. Also, are there parts/sensors that frequently fail that would make sense to proactively replace if engine out?
I replaced every coolant hose on my car and every vac part when i did my aos. I did not remove the engine, just pulled the intakes. I just went through the pet drawings on the autoatlanta web site.
Our AOS had a coolant leak at the bottom of the circular housing that has the diaphragm in it, then after a high speed run it started pouring oil out of exhaust. Lucky we had it towed because after starting to smoke it consumed about a quart and half of oil in 60 seconds! If we tried to drive any distance it would have hydrolocked and destroyed the engine or ran out of oil and destroyed the engine.
Your AOS is like ours, and it is different than the one in the Pelican guide, the Porsche parts guide, and the one in the picture of the guy who changed all his hoses. Theirs mounts on the back of the engine ours is on top.
New AOS installed. Note clamp on bottom, that along with bolt and hose not visible on the left are very very difficult to install with engine in car. There are three hoses at the top and they ain't easy either.
Not only tools, time, and a work shop, a person needs a lot of mechanical ability to do this job. We took lots of pictures and labeled most items coming apart so not only clear where they go but also order to put back together. If a person hadn't removed an intake manifold on a European car or something like replaced a water pump on one, they need to take this job to a professional.
The old AOS must have been leaking for awhile you can see the dried coolant residue caked on it.
With a lift you might want to consider just dropping the trans. I just did my IMSB (also the EPS bearing), along with the AOS and oil cooler o-rings "while I was in there". I don't have a lift but, having done it once, I could probably drop the trans in less than 3 hours which sounds relatively easy compared to what others have gone through removing the intake, etc. Regarding replacing the hoses, I'm told modern hoses, 20-30 years old are just so damn good not to worry about them as long as they're not exposed to oil, BUT this is from my Jeep friends whose engines are a fraction of the value of a M96 so I get it with these cars.
Yea i have a mk1, 3.4l motor. The aos is a little easier to get to but still a pita. I really didnt find the job all that hard, i just needed to "figure out" the process. I installed the uaos system so i wont have to do it again.
I replaced all the lines last winter because i had a clam failure at the track and the engine bay hoses felt bad. I did all of then so i would not have to go back into the system. I do think the hoses not in the engjne bay will last for much longer.
this winter i did pull the motor for variocams. Although i got it our in 4 hours. I have a lift. I still dont think i would pull the motor for an aos replacement but i would replace the aos if the motor was out.
Thanks 996.2 for pointing that out.
This pic is from the Pelican Parts repair instructions. It IDs the main picture as "996 and first year 997." It IDs the small picture as "2008."
This is from Pelican Parts for 1999-2001. 996-107-023-55-M100
This is from Pelican Parts for 2002-2008. 996-107-026-51-M100.
This is the AOS on the back of a 2003 engine.
That is ours without the bellow. At lower left on the bottom of the AOS there's a funnel shape and that clamp you need remote releasing clamp pliers. At the right there's a small wire bundle it runs underneath the AOS bottom port, on mine the wire was on top of the port and had to carefully cut off port with a hacksaw then I could take it apart. When I put it back together I put the wire under the AOS port like the picture and hope it doesn't chafe against the aluminum engine block.
Review my posts near the end of the UAOS thread and you will learn a lot of tips and tricks. Another thing that would have been very helpful is in addition to an inspection mirror which is mandatory for this job, if I had a larger mirror that I could clamp on to a hose or something in the engine compartment and position that larger mirror that would free up one hand that I was using to hold the inspection mirror and provide a much better view. Also a bright headlamp and a whole bunch of spare batteries is just about mandatory, that lets you get a clear view of whatever you need to see in that dark compartment.
Just a hacksaw blade no big frame and handle. Someone with a strong grip has a huge advantage in releasing the hoses off the ports and centering the AOS and intake manifold when reinserting the bolts.
Ln engjneering makes a wrench to put over the aos tube fittings so u dont have to squeeze them. Its arojnd $35. May help some of u guys with large mitts.
Just read up on it, thanks. Not in budget right now. Just purchased a used and rebuilt Rotary SP0A9 that should get installed before the weekend. Great price, $1800 plus $400 installation fee. The guy is a Rotary dealer. If anyone is near Pensacola, he has another SP0A9 and some others including a drive-on. PM me and I give you his info.
Mine is a 2000. Before seeing the pics you posted I had no idea the 996.2 was different. Mine came out sideways and up slightly, then rolling it over, even then it only cleared by a mm with me levering the engine slightly. Anyway, glad I don't need to worry about it for awhile, hopefully.
This is a source reference. Confirm exact model applicability in the original material.
