9 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
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YOUR RESEARCHItem part number and description identification help
Leading reported evidence
Replace air oil separator
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
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0
Unsuccessful attempts
1
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Leading evidence: 'Replace air oil separator' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check ball inside' (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.
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1
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Performed · outcome unconfirmed
..We also replaced our AOS as preventive maintenance.
Item part number and description identification help
Check ball inside
Suggestion or failed attempt
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Suggestion
If I remember correctly, it's just a spring and a check ball inside.
Item part number and description identification help
Run 1/3 oil
Suggestion or failed attempt
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Suggestion
On the SPB we run 1/3 oil on the dipstick when cold
Item part number and description identification help
Run car
Suggestion or failed attempt
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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.
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Suggestion
Turns out we were running the car with too much oil on the track hence the leak.
Item part number and description identification help
Coverage and how to read this overview
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.
9 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: 20261026T103553Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
That is a breather line that runs from the AOS to the 4-6 cylinder head. I think the part number for the connector is 996.107.047.51, crankcase vent elbow, but don't hold me to this.
Bumping old thread.
How should this vent valve work? I removed mine to clean it and it seems it has spring and check ball inside but no matter how hard I blow or suck, it doesn't open.
It looks like it should open if there is excessive pressure inside crankcase.
In what kind of case that would happen?
I'm trying to find cause for unusual noise with part throttle and also around 2000rpm.
I want to verify if this part it function OK or not.
It is a crankcase bleeder connector for the AOS system. You are correct, it should open if there is excessive crankcase pressure, like a pop off valve. For $25 I would just replace it.
http://www.einmaligparts.com/Crankca...10_c_7807.html
Excessive crankcase pressure - bad/worn piston rings, leaking valve stems and seals, all kinds of bad things
Normally the crankcase is under vacuum as well as the intake manifold. i guess the engine designers felt that under rare circumstances where excessive crankcase pressure could occur, it is better to have the pressure relieved than to blow out seals all over the place. I have no idea when that might occur under normal driving.
.. We had a similar leak on our spec Boxster (uses the same part). Turns out we were running the car with too much oil on the track hence the leak. On the SPB we run 1/3 oil on the dipstick when cold
I do not recommend this for a tracked 996 as you're moving more oil since you are at least 3.4L and the SPB is 2.5L.
..We also replaced our AOS as preventive maintenance.
https://rennpart.com/carrera/carrera...tenance-parts/
This is a source reference. Confirm exact model applicability in the original material.
