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YOUR RESEARCH2000 model 996 Turbo Has anyone had experience of engine rattle at 1,500 revs.
Reported or suspected cause
bolts undoing
Reported cause
No successful repair reported for this finding.
1
Identified cause
0
Suspected cause
0
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Reported cause
There is also a very rare failure where the usual IMS noise gets much louder over a short time, this is due to the bolts undoing on the IMS cog.
2000 model 996 Turbo Has anyone had experience of engine rattle at 1,500 revs.
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Leading evidence: 'bolts undoing' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'bolts undoing' (1 discussions; 1 report identifying it and 0 suggest it). 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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2000 model 996 Turbo Has anyone had experience of engine rattle at 1,500 revs.
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10 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
911uk: 1 discussions
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If you have a stethoscope or a piece of wood/long screwdriver etc, listen to each chain, I have something similar which is likely to be a worn chain tensioner where the noise vanishes at 1800 rpm.
This is a tricky one to answer over a forum. The intermediate shaft (IMS) in a 996t does make a distinctive noise which new owners often ask about, and it often sounds the loudest just above tickover, so it could be that you're describing. But it doesn't mean it's not something else. There are many other things it could be.
There is also a very rare failure where the usual IMS noise gets much louder over a short time, this is due to the bolts undoing on the IMS cog. If caught early this is not expensive, if left until it fails, then it is very expensive.
Google 996 turbo intermediate shaft noise there will be quite a few vids come up.
If you could do a clip that would help.
If it's very loud then I wouldn't drive it and get it trailered to a good Indy in case it's the rare IMS cog fault!
As mentioned by Mac a video will definitely help to get more accurate feedback. I’m hoping it’s something and nothing that can if needs be fixed easily
Many thanks for your detailed response. I did however notice small aluminium shavings in the oil filter. Car runs and pulls very well. Tick over ok, just when you hit 1500 rpm.
I will investigate your suggestions.
Thanks
Having found that I wouldn't start it again until you have it properly looked at , it shouldn't have metal debris in the filter at all and something has clearly gone wrong.
It is a Mezger, and it does have an IMS just a different design to the infamous one!
You can see bolts that come un done behind the sprocket, it is very rare.
Again a pic of the metal in filter would help, a couple of flakes could be considered normal, any more and follow advice and get it checked out.
