4 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHInterpreting Blackstone Analysis Results
Leading reported evidence
Check oil filter
Suggestion or failed attempt
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 contain suggestions
1
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Leading evidence: 'Check oil filter' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check oil filter' (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.
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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.
Discussions that contain suggestions
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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.
Discussions that contain suggestions
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Suggestion · Original poster
I'm also looking at replacing the cam chains and chain tensioners (and all that goes along with that - basically what I understand to be a top-end rebuild).
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
I'm also looking at replacing the cam chains and chain tensioners (and all that goes along with that - basically what I understand to be a top-end rebuild).
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.
4 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
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Generation: 20261026T183130Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
The last time I posted this, I saw only one response. So I'll try again (insert smiley face).
I just received this Blackstone analysis report for my 2001 C2 996. It shows high silicon and iron, but low aluminum. The car has 155,000 miles on it and, from what I can tell, the IMS has never been touched in the life of the car. I am planning on a new clutch and IMS bearing in the near future. I'm also looking at replacing the cam chains and chain tensioners (and all that goes along with that - basically what I understand to be a top-end rebuild). In this upcoming major, major service, I want to address as many of the existing issues as possible.
Questions
:
Do you agree with the comments from Blackstone?
Are there any other reasons why silicon and iron would be high in the absence of bore scoring?
Do any of you have any recommendations beyond those in the Blackstone report?
Thanks, Mark
Not a good report...need more background info
Silicon being high could be from recent engine work, ( silicon sealer), or from dirt ingress ( air leak or filtering not adequate) , or worst case Lokasil ( bore scoring).
Without high Aluminum bore-scoring is less likely.
Iron being high could be caused by a failing IMSB, or from timing chains/gears, cam/lifter wear..
Did you inspect the filter? any debris in there? any noise from the engine? What is the hot oil pressure?
I was also thinking that bore scoring was not likely, given the nominal amounts of aluminum.
My planned work would cover the IMSB and the timing chains/gears and cam lifters and tensioners, so that should address a possible source of iron.
I haven't inspected the filter for debris, but I'll have the shop report on that. There's no noise from the engine other than some racket on startup that I attribute to the worn cam tensioners. Hot oil pressure is good.
My aftermarket IMSB started failing a year ago. I first noticed the ferrous metal in the oil filter. I also had a high iron content in my Speediagnostix UOA. I second the suggestion to check your oil filter. You will probably see magnetic flakes there if it's an IMSB.
This is a source reference. Confirm exact model applicability in the original material.
