10 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHEngine oil leak From top Rt corner of engine
Leading reported evidence
Replace aos and valve
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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Discussions that performed work without a confirmed outcome
1
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0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Leading evidence: 'Replace aos and valve' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Inspect ims brg (has the latter non serviceable brg)' (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 also had a small RMS leak, so they replaced the RMS, AOS, and vent thing.
Inspect ims brg (has the latter non serviceable brg)
Suggestion or failed attempt
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 contain suggestions
1
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Suggestion · Original poster
Thanks guys, I have the trans out to inspect the IMS Brg (has the latter non serviceable Brg) and replace the clutch.
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
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Suggestion
I recommend replace both the AOS and that valve, especially if the AOS is original.
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
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Suggestion · Original poster
I may have to pull manifolds anyway to replace the breather hose.
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Suggestion
I also recommend replacing all the o-rings (internal) on the corrugated AOS hoses (4 o-rings total) and the o-ring on that breather valve if it doesn't come with the valve.
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.
10 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.
1 acknowledgements have no verified action link; they do not establish a repair result.
Outcome without a verified action link
And yes, put 25,000 miles on after and it solved all the problems.
I just noticed oil leaking down the Rt rear corner of the engine case on 1999 996 C-2. At first I thought it may be spark plug tube but the oil appears to coming from above that area. Does anyone know if there is a sensor that may be in that area that may have a leaking ring or seal? I haven't pulled anything apart yet, just wondering if someone knows what I may be in for.
There's an AOS breather connector that could sweat/leak at the right rear corner of the engine (rear = toward the exhaust). Just look under the a/c compressor.
There's an oil pressure sender at the right front of the engine. Look at the right intake manifold runners deep inside the engine bay.
Don't think it's the cam seal, oil coming down from above seal. There is a breather hose that comes from the AOS which ends up right over right rear corner of the engine with a small screen or air filter like adapter at the end of the pipe. Any chance oil could be coming from the AOS unit and out that tube. If so, would the failure be the adapter at the end of the tube or failed AOS?
There is a breather valve here
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Had it happen to me. Was a bad AOS (which was less than a year old) that caused oil to come out the valve.
Dealer replaced the AOS and valve
Yeah, I am pretty certain is coming from the breather pipe that comes from the AOS. Thanks for posting photos, the oil I see is in the same area and the small breather valve is wet from oil. Did the replacement of the AOS stop the oil leak and do you know if the breather pipe was replaced?
I also had a small RMS leak, so they replaced the RMS, AOS, and vent thing. Cost was $2000. I can't remember for sure, but they may have had to drop the engine to get to the valve.
And yes, put 25,000 miles on after and it solved all the problems.
I recommend replace both the AOS and that valve, especially if the AOS is original. The AOS will not be too bad as yours a Mk I but that breather valve will be a bit of a pain to replace. I also recommend replacing all the o-rings (internal) on the corrugated AOS hoses (4 o-rings total) and the o-ring on that breather valve if it doesn't come with the valve.
Thanks guys, I have the trans out to inspect the IMS Brg (has the latter non serviceable Brg) and replace the clutch. Not sure but it looks like I can access the AOS from underneath with the trans out without Pulling everything apart up top. I will take your advice and replace orings and breather hose. I may have to pull manifolds anyway to replace the breather hose. Any additional tips would be helpful.
Even with the trans out, most ppl also needed to work from the above (with left intake manifod removed) as well to remove the AOS. Lower the engine as much as it can go will help quite a bit.
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