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997 carrera engine timing


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  • 4 weeks later...

I don't mean to be critical, but if you are setting camshaft timing, this is very important. If you are not sure what you are doing, you shouldn't be doing it. This is not minor work and means that the engine is probably out of the car for major issues. Trying to diagnose something like this over the internet with truly insufficient information is an invitation to disaster.

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  • 5 years later...

just curious - would the M96 engine engine run at all if the chain between IMS and one of the heads would jump by one tooth (~15-20 deg) ?  I only see instructions "don't start engine if the cam tool does not line up". If doing otherwise - I am wondering whether a valve / piston collision is likely at the moment of the first start or whether there will be in first place performance issues noticeable...

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4 hours ago, 9552T500 said:

just curious - would the M96 engine engine run at all if the chain between IMS and one of the heads would jump by one tooth (~15-20 deg) ?  I only see instructions "don't start engine if the cam tool does not line up". If doing otherwise - I am wondering whether a valve / piston collision is likely at the moment of the first start or whether there will be in first place performance issues noticeable...

 

While it is never a good idea to start one of these engines if you know or suspect the cam timing is off, once you get beyond around 12 degrees you are in trouble.

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19 hours ago, JFP in PA said:

 

While it is never a good idea to start one of these engines if you know or suspect the cam timing is off, once you get beyond around 12 degrees you are in trouble.

Thanks for the 12 deg hint - which tells, that trouble is expected even by changing cam timing by less than the equivalent of a one tooth slip. I had the shafts locked but I still had no 100% confidence as the  21 T sprocket on IMS is not visually accessible while  tensioners are  released and shaft manipulated. Seeing is still believing, and if direct access is not given, then what-if-thinking is the most appropriate way to manage risk. However, all worked out after all. Have new LN eng IMSB & RMS now and the car runs as before this preventative work.

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