10 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHFailed (mushroomed) lifters on M96 engines? - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Reported or suspected cause
m96.23
Reported cause
No successful repair reported for this finding.
1
Identified cause
0
Suspected cause
0
Reported fixes
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 report identifying a cause
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.
Reported cause · Original poster
"the engine that suffers from this issue is the M96.23 which is a 3 chain 2.7 engine used only in the base model Boxster.
Failed (mushroomed) lifters on M96 engines? - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Read full discussion summary
Leading evidence: 'm96.23' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'm96.23' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Check intake lifters' (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 · Original poster
"the engine that suffers from this issue is the M96.23 which is a 3 chain 2.7 engine used only in the base model Boxster.
Failed (mushroomed) lifters on M96 engines? - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Check intake lifters
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
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
not too long, the cams can't fall out when you take the valve cover off and you only have to check the intake lifters on cylinder 1.
Failed (mushroomed) lifters on M96 engines? - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Inspect lifters
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
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
If 5 chain engines are affected I will have to pull the valve cover and inspect the lifters on the 3.2 that I am preparing for installation in my car.
Failed (mushroomed) lifters on M96 engines? - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Replace (all receipts at hand)
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
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
I have 2.7 that I just replaced the chain ramps adn the lifters as well as the cams look like brand new - car has now 299.750 km with a great service history and frequent oil changes (all receipts at hand).
Failed (mushroomed) lifters on M96 engines? - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Replace (all receipts at hand)
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
I have 2.7 that I just replaced the chain ramps adn the lifters as well as the cams look like brand new - car has now 299.750 km with a great service history and frequent oil changes (all receipts at hand).
Failed (mushroomed) lifters on M96 engines? - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Replace frequently
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
Never heard of this kind issue, but maybe that problem (and many others) will come if the engine has not been looked after and oil has not been changed frequently.
Failed (mushroomed) lifters on M96 engines? - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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.
10 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
986Forum: 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: 20261027T025149Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
In Help Me DIY's (TTGator) recent forensic video on his failed 2003 2.7 Boxster engine he reveals that Jake Raby diagnosed the problem as a mushroomed valve lifter. According to Jake this is a common problem caused by an improperly machined camshaft. On cylinder one an intake valve lifter had broken and and the second one was about to fail.
The video is here, explanation is after 7:00 minutes:
https://www.youtube.com/watch?v=bN5RJRvZlUo&list=PL8ogZBhXvNyZCp7OSJEVa-qf5JN-vtkX3&index=17&t=2s
I searched for information on this failure but found nothing... does anyone have more information? Specifically, what engines are affected? My assumption is that the problem would only be with the 3 chain engines. If 5 chain engines are affected I will have to pull the valve cover and inspect the lifters on the 3.2 that I am preparing for installation in my car.
I have 2.7 that I just replaced the chain ramps adn the lifters as well as the cams look like brand new - car has now 299.750 km with a great service history and frequent oil changes (all receipts at hand).
Last three years I have also raced it on local Porsche Racing Club.
Never heard of this kind issue, but maybe that problem (and many others) will come if the engine has not been looked after and oil has not been changed frequently.
I cross posted this thread on the Rennlist 996 forum and got some interesting answers there.
https://rennlist.com/forums/996-forum/1336189-failed-mushroomed-lifters-on-m96-engines.html#post18621319
From what was said on the thread on the Rennlist 996 forum
"the engine that suffers from this issue is the M96.23 which is a 3 chain 2.7 engine used only in the base model Boxster. He says that he has seen something similar with the M96.24 3.2 variant of the engine, but not very frequently. These are unique engines since they are 3 chain design, but do not utilize variocam Plus."
So if your car fits this description... not too long, the cams can't fall out when you take the valve cover off and you only have to check the intake lifters on cylinder 1.
If you go to 14:00 of this video you see (and Aaron explains) how the cams are held in place.
https://www.youtube.com/watch?v=wT2b2w-_9l0&list=PL8ogZBhXvNyZCp7OSJEVa-qf5JN-vtkX3&index=9
I would put the engine in TDC for that bank and lock the cams before taking the cover off. None of the lobes should be under tension at that point... I think.
I take no responsability for this free suggestion.
Remember also to take the chain tensioners out after you have locked the engine to TDC and locked the cams in place.. After that you can remove the camcovers.
This is a source reference. Confirm exact model applicability in the original material.
