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IMS Bearing Check At Service
- Thread starter mojo
- Start date
Macan360
New member
Macan360
New member
Haveing carried out some costing and research before purchase I bought with confidence. However haveing purchased and hearing about the constant concerns over IMs bearing problems I emailed the dealer asking the following questions.
What engine does my car have fitted to it is a M96 or M97 type?
Answer:- M97
Does the version fitted to my car suffer with the dreaded IMS bearing and timing chain problem?
Answer:- The Majority of these leaks have been cured by now with modified parts. You should have no trouble with this.
Is there anything I can do to spot an impending failure?
Answer:- Not really no, this can only be checked on a ramp as covered by under trays.
Also stereo sometimes comes up with the word stop which is difficult to clear.
Answer:- This could be a internal fault with the radio, this would need to be booked into the workshop for further diagnosis.
I note on this forum the cd player issue is known problem
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I have three remaining question, is the ims bearing checked at service if not it an easy thing to do?
Does anybody have a list of the items checked by porsche before Warranty is valid?
In the GT Porsche Magazine for April it says a Porsche with a tracker fitted other that the Porsche version would not get Porsche approval for warranty. I have had a tracker 25hr monitor fitted since purchase would this make my warranty invalid. Can't really ask Porsche now can I
Any information greatly appreciated
Cayman 295
Macan360
New member
Perhaps Richard can confirm but I believe that on the Gen II engines the cams are driven directly from the front end of the crankshaft only, obviating the requirement for the IMS. The IMS arrangement allowed identical cylinder blocks and heads to be used for both right- and left-hand sides of the flat-6 unit, thereby reducing costs. The 996/986 engines use the original VarioCam system on the inlet cams. The IMS drives the exhaust cams (one chain per bank) and additional short chains link each exhaust cam to its inlet cam, with an electronically controlled double chain tensioner between the two sides of the chain providing the timing variation. The 997/987 Gen I engines use current the VarioCam Plus system which combines variable valve timing with 2-stage lift on the inlet cams. The timing is controlled by an electro-hydraulic rotary vane adjuster at the front of each inlet cam and I believe that the IMS drives the cams by a single chain for each bank. JeffORIGINAL: Buddy Effectively it is the mechanical timing shaft to go 2:1 from the crank and from the IMS to the valvegear it is 1:1 as normal but in Gen2 this is achieved by other means, as I have a Gen 1 I've not really investigated how it was done but it must be covered by some mechanical means in the engine.
![8B1416E5BE7B44B19D72D87C3C6AD9C8.jpg](http://local://upfiles/4155/8B1416E5BE7B44B19D72D87C3C6AD9C8.jpg)
berty987
New member
Macan360
New member
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