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997 Engine Failure

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6 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis

THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCH997 Engine Failure

Leading reported evidence

Use 3

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
They used 3 set screws - not one.
Original post Read captured discussion
997 Engine Failure

Frequently discussed work

Set screw

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

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
I think the 997 sprockets have a set screw.
Original post Read captured discussion
997 Engine Failure

Suggestion
Maybe that happened with the one(??) set screw on the 997 IMS ?
Original post Read captured discussion
997 Engine Failure

Read full discussion summary

Leading evidence: 'Use 3' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Set screw' (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.

Read captured replies

1 matching discussions · 6 captured posts examined · 0 partial discussions

Compare 3 other evidence results

Set screw

Suggestion or failed attempt

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

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
I think the 997 sprockets have a set screw.
Original post Read captured discussion
997 Engine Failure

Suggestion
Maybe that happened with the one(??) set screw on the 997 IMS ?
Original post Read captured discussion
997 Engine Failure

Set screw broke, backed out or what

Suggestion or failed attempt

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

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
I don't know if the set screw broke, backed out or what.
Original post Read captured discussion
997 Engine Failure

Set screws - not one

Suggestion or failed attempt

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

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
They used 3 set screws - not one.
Original post Read captured discussion
997 Engine Failure

Frequently discussed actions (4)

These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.

Set screw

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

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
I think the 997 sprockets have a set screw.
Original post Read captured discussion
997 Engine Failure

Suggestion
Maybe that happened with the one(??) set screw on the 997 IMS ?
Original post Read captured discussion
997 Engine Failure

Set screw broke, backed out or what

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

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
I don't know if the set screw broke, backed out or what.
Original post Read captured discussion
997 Engine Failure

Set screws - not one

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

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
They used 3 set screws - not one.
Original post Read captured discussion
997 Engine Failure

Use 3

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

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
They used 3 set screws - not one.
Original post Read captured discussion
997 Engine Failure

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.

6 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: 20261027T042512Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

A friend with a 997 recently had a catastrophic engine failure. The cuse was determined as the gear on the intermediate shaft slipped causing the cams to have a large deviation and then failure. What could have caused the gear to slip? TIA

POST 2Original post

Any force fed oil pressure to the IMS for the IMSB? Those sprockets are just press/interference fit (not welded not pinned) and can slip naturally, as Jake has explained many times before.

POST 3 / ORIGINAL POSTEROriginal post

Completely stock motor no force fed oil pressure. I think the 997 sprockets have a set screw. I don't know if the set screw broke, backed out or what. Is there enough force to break a set screw? The car has approximately 10,000 track miles. There was not a missed shift or over rev. Thanks

POST 4Original post

Paging Jake...

POST 5Original post

I had my M96 IMS gears 'professionally' pinned. They used 3 set screws - not one. But they forgot the threadlocker ! Maybe that happened with the one(??) set screw on the 997 IMS ? Unlikely but maybe Porsche forgot the red threadlocker when the engine was originally assembled? I just cleaned mine and added the correct spec Loctite.

POST 6Original post

Quotes source post: 13702463

Nothing new.. Mode of failure #24, I documented this one many moons ago. See this video: You Tube That said, we weld and pin the 4 sections of the IMS assembly together. From the factory they have a light press fit, which sucks. The rear sprocket of the IMS has only 3/8" of engagement onto the IMS tube, which is idiotic. This is a pretty decent failure to have, I can repair that one without breaking a sweat...

This is a source reference. Confirm exact model applicability in the original material.