ims in rebuild

[davea1954]

Hi all, a simple question, but one that I have not found an answer for - yet. Looking at purchasing 2002 - 05 911. Found one with an under- warranty replacement motor in it. My question is what type of IMS bearing would Porsche have installed during the rebuild? If rebuild occurred pre 2008 would they not have installed the same kind of IMS bearing that failed in the first place and was the cause of the engine self destruction? Seems logical to me, to my way of thinking why would Porsche have one type of IMS bearing for new motors and a different kind for rebuilds during this period of less then reliable IMS bearings? But so far I have yet to find someone who can confirm or refute this opinion. Hopefully someone here has then answer. Also don't know if rebuild was installed under initial new car warranty or under some type of extended warranty which could have put the motor exchange 2008 or later when the IMS reliability issue was fixed. Thanks. Dave

[TheSt|G]

As a heads up, this is an aircooled forum.

[Arne2]

Better results if you post your question here -> Porsche 996/997 Forum - Pelican Parts Technical BBS

[lyonsfin]

You may be able to get the answer through a dealer with the car's VIN

[Elombard]

I think Wayne covers this in his book on the 996. Pretty sure they covered it in Excellence Mag in one of the IMS articles. I think the answer is needs to be changed every time the clutch is changed at a minimum.

[rattlsnak]

To answer your question, yes they would have used the same bearing that is prone to failure. They only have one OEM type.

[Eharrison]

Originally Posted by rattlsnak

To answer your question, yes they would have used the same bearing that is prone to failure. They only have one OEM type.

+1
I do not believe Porsche modified the bearing, ever.

[davea1954]

OOPS! Sorry about being in the wrong forum, but greatly appreciate your taking the time to pass on the info. I think rattlsnak hit the nail on the head, thanks. What other answer could there be. Thanks again. Dave

[otto_kretschmer]

Porsche IMS Bearing Story featuring the Direct Oil Feed (DO) - YouTube

my knowledge of the water cooled 911s is spotty

some of the earlier engines can use this kit and I think at some time Porsche bean counters changed the design where you have to split the case to fix a IMS bearing failure

in what year is that split? I dunno

but its good to know that there are people out there who are coming up with fixes


Vote for Pedro

(edit: split is 05 and newer according to Pedro)

[porwolf]

Originally Posted by otto_kretschmer

Porsche IMS Bearing Story featuring the Direct Oil Feed (DO) - YouTube

my knowledge of the water cooled 911s is spotty

some of the earlier engines can use this kit and I think at some time Porsche bean counters changed the design where you have to split the case to fix a IMS bearing failure

in what year is that split? I dunno

but its good to know that there are people out there who are coming up with fixes


Vote for Pedro

(edit: split is 05 and newer according to Pedro)

I watched all of the video. The IMS Failure situation and explanation what the different IMS bearings in different production years are seems very good and easily understandable. So, the video talks about which production years have which IMS bearing.

[otto_kretschmer]

Dave,

If you buy a 996 or early 997, you should budget a IMS kit. I have been following the IMS issue for a few years. Beancounters took over Porsche (and BMW and Mercedes) and let the stylist take control and sent the engineers to the back of the bus. To reduce cost, Porsche got rid of the dry sump oil system and when it came to the bearings of the IMS, they plumbed only one of the bearings to the oil gallery and the other they used a seal cassette. The cassette bearings started failing and Porsche had some serious egg on their face and many angry customers.

The direct oil kit is a band aid, but it appears to works. Band aids in engineering are common.

[davea1954]

Thanks for all the replys.

[johnsjmc]

I recall reading there are wide and narrow IMS bearings. The experts on this (and which would be in a Porsche replacement )would be LN engineering or Jack Raby. One or both of them were the people who developed the IMS replacement kit.