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porsche996tt_tpe

Loud humming noise from the crank case

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Posting this as a request for a shop owner who's been working on this problem for months w/o solution...

 

Car is 996 turbo. The engine has a loud humming noise (like that of a bad bearing) from the crank case, from the center crank shaft. The sound was isolated using a stethoscope.

 

All the copper sleeves on the shaft have been replaced, along with other replaceable/wearable parts.

 

He finally swapped the whole crank case from another TT engine, the noise is gone. But he can't figure out why...

 

The shop-owner said, he's seen a few TT with the similar noise as they age, but most car owners simply ignore it.

 

Any inputs? 

 

 

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The ball bearings have been replaced with new. So it's not from the bearing itself.

 

The noise is apparent from idle to about 3000RPM.

 

The noise is gone when the major components in the crank case (incl. the shaft) are swapped with another spare.

 

Any inputs? Thanks.

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