How long does it take once an IMS starts to go?

[JFP in PA]

Originally Posted by BDBoxster

While we're talking about the IMS issue, I have a question that I hope somebody can answer. In the late production 2005 through 2008 987's, Porsche installed a bearing that is not accessible without a total engine teardown. This bearing is supposed to be larger than all the other bearings that they have used in the past. What does this mean? Is is a single or dual row? Is it sealed? What does "larger" mean?

It is sealed, a dual row, and slightly larger in outside diameter so it will not fit through the opening in the rear of the cases. And, yes, it still fails.

[Steve Tinker]

Originally Posted by JFP in PA

It is sealed, a dual row, and slightly larger in outside diameter so it will not fit through the opening in the rear of the cases. And, yes, it still fails.

Well there's something I didn't know - I was under the impression that Porsche fitted a larger SINGLE row bearing after 2005, right up to the 2009 upgrade ....

[BDBoxster]

Originally Posted by JFP in PA

It is sealed, a dual row, and slightly larger in outside diameter so it will not fit through the opening in the rear of the cases. And, yes, it still fails.

Thanks for the info. Just to stretch the issue....how many failures have you dealt with or her about with this last bearing design? I'm just wondering, in your professional opinion, if you think it is as prevalent as past designs or in a very small category (ie:<1%)?? Thx!

[stephen wilson]

From what I've read, the larger bearing should have failure rate similar to the double row bearings. Though that information may be worth exactly what you paid for it!

[JFP in PA]

Originally Posted by BDBoxster

Thanks for the info. Just to stretch the issue....how many failures have you dealt with or her about with this last bearing design? I'm just wondering, in your professional opinion, if you think it is as prevalent as past designs or in a very small category (ie:<1%)?? Thx!

We have personally seen a few, but the actual percentage is very hard to get a handle on. But if a couple die, it is a fair conjecture that there are more....

[BDBoxster]

Originally Posted by JFP in PA

We have personally seen a few, but the actual percentage is very hard to get a handle on. But if a couple die, it is a fair conjecture that there are more....

Thanks for the feedback....one last question. Since you have seen a few failures already in this last design, besides the outer bearing diameter being a little larger so that it can't fit threw (hence the total engine teardown) my question is are the actual bearings larger in this dual row design than previous dual row IMS bearings? Are they ceramic? Did the seal dissolve? Thanks for the help!