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Smallblock454 · 07-16-2014, 06:14 AM

Hi,

did you mean this video: Porsche Boxster Noise IMS Bearing? - YouTube

Sounds like a hydraulic lifter problem to me. Also the fan is very loud. If it's a harder knocking it also could be a big end bearing problem (piston rod).

But as i said, a failed IMS will lead to bad engine timing because the chain is jumped over or to a total loss because the chain is torn. I don't think you can hear a bad bearing - and that won't be Tac Tac Tac, because it has to be a grinding, or abrazing noise when a ball bearing fails.

An oil check is a good idea. If you like to do an oil change you can also inspekt the filter. There are also laboratories that can examine oil samples.

Regards
Markus

07-16-2014, 06:14 AM	#5
Smallblock454 Registered User Join Date: Jun 2014 Location: LB, Germany Posts: 1,456	Hi, did you mean this video: Porsche Boxster Noise IMS Bearing? - YouTube Sounds like a hydraulic lifter problem to me. Also the fan is very loud. If it's a harder knocking it also could be a big end bearing problem (piston rod). But as i said, a failed IMS will lead to bad engine timing because the chain is jumped over or to a total loss because the chain is torn. I don't think you can hear a bad bearing - and that won't be Tac Tac Tac, because it has to be a grinding, or abrazing noise when a ball bearing fails. An oil check is a good idea. If you like to do an oil change you can also inspekt the filter. There are also laboratories that can examine oil samples. Regards Markus Last edited by Smallblock454; 07-16-2014 at 06:16 AM.