Menu toggle

Hot!IMS and rear box replacement

PCGB Member
  • Total Posts : 88
  • Joined: 2018/05/28 10:37:35
  • Status: online
Tizzy PCGB Member
2020/08/01 16:24:30 (permalink)

IMS and rear box replacement

So I had my IMS replaced last week with a new ceramic version. Apparently the original (pictured) was actually in good shape after 95k, and it certainly rotated smoothly, though was full of oil, so I guess only a matter of time... What I did find interesting was that the IMS bearing is actually Made in England by NSK, quite surprising in a German engine - at least I thought so.
My back boxes had been welded (Badly) in a previous ownership and were split and beginning to blow. So my specialist, Cavendish Porscha in Long Eaton, recommenced a new stainless system from Spyder Performance which has remote switchable valves. I am really impressed with the quality and fit of this system and thus far would certainly recommend it - not unduly expensive either. The sound with the valves Off is basically stock exhaust, shade throatier. With the valves On, OMG, you might as well be in a GT3 - no Carrera I’ve ever seen has sounded like this! To be fair it is quite loud, but simply turned on or off via a fob mounted remote. Anyway I’m not affiliated to either Cavendish or Spyder, but would recommend both to other forum members. 

Cheers Chris

Attached Image(s)

2002 996.2 C2 Cabrio.
Daily drivers: 2019 Range Rover SVR, 2014 991.1 Targa 4S
In the past:
2003 986 Boxster S Gen 2
2004 996.2 Carrera 2
1989 944 2.7 LUX (Resto. Project)

4 Replies

PCGB Member
  • Total Posts : 5074
  • Joined: 2011/04/20 12:13:14
  • Status: offline
Motorhead PCGB Member
Re: IMS and rear box replacement 2020/08/01 17:53:00 (permalink)
Good to hear that the IMS bearing replacement went well and that you're now sorted. Somehow I've never been able to understand the philosophy behind running a (supposedly) grease-filled sealed bearing in a sump containing engine oil. Why not just rely upon that for lubrication, although I'm sure Porsche had their reasons?
I have the feeling that the IMS arrangement was carried over from the air-cooled engines which had a true dry-sump lubrication system and which would have required a sealed bearing since the majority of the oil would have been scavenged, but in the water-cooled cars oil is present in the engine sump, although oil is scavenged from the cam boxes.
Interesting choice and recommendation for the cat-back from Spyder Performance. There are so many systems available these days that it's a bit of a minefield. Because requests for exhaust recommendations are cropping up regularly on this and the Cayman forum it would be a good idea to have a pinned post in which recommendations - or otherwise - could be posted for reference.

987.2 Cayman S
North Beds (R10 & R24)
PCGB Member
  • Total Posts : 8133
  • Joined: 2004/10/08 11:07:01
  • Status: offline
Richard_Hamilton PCGB Member
Re: IMS and rear box replacement 2020/08/02 09:57:02 (permalink)
The fact that it had become 'unsealed' and that oil was getting in, is probably why it was in good shape (and would likely have stayed so).  Some folks even go to the extent of removing the seal to let oil in.  Bear in mind the bearing is below the level of oil in the sump.

2017 Cayman S & Audi RSQ3
1989 3.2 Carrera Sport, 2012 Cayman 2.9 PDK, 2006 Cayman S, 2000 996 Turbo, 1998 996 C2, 1994 993 C2
PCGB Member
  • Total Posts : 779
  • Joined: 2006/12/29 22:49:29
  • Status: offline
wibble PCGB Member
Re: IMS and rear box replacement 2020/08/14 20:14:46 (permalink)
Also need to be aware that ceramic bearings are not lifetime according to some forum posts. Does not detract from enjoying the cars performance for many years.  Worth mentioning that the scavenger oil pumps are British manufactured, well on mine at least.

1999 996 Carrera 4 - Ocean Blue
1990 944 Turbo - Guards Red
Gordon Fogarty
Guest of the Club
  • Total Posts : 72
  • Joined: 2005/09/30 16:27:40
  • Status: offline
Gordon Fogarty Guest of the Club
Re: IMS and rear box replacement 2020/09/14 20:49:01 (permalink)
just had the IMS changed in my 996, but the flexi pipes on the Dansk silencers did not survive.
Silencers are 6 yrs or 15000 miles old.
Any solutions for replacing flexi joints without replacing silencers which are otherwise fault free? 

Porsche 996 C2
Hillclimb Prepared Fiat X1/9
Alfa Romeo Giulietta Cloverleaf
Jump to:

Posts made and opinions expressed are those of the individual forum members

Use of the Forum is subject to the Terms and Conditions


The opinions expressed on this site are not necessarily those of the Club, who shall have no liability in respect of them or the accuracy of the content. The Club assumes no responsibility for any effects arising from errors or omissions.

Porsche Club Great Britain gives no warranties, guarantees or assurances and makes no representations or recommendations regarding any goods or services advertised on this site. It is the responsibility of visitors to satisfy themselves that goods and/or services supplied by any advertiser are bona fide and in no instance can the Porsche Club Great Britain be held responsible.

When responding to advertisements please ensure that you satisfy yourself of any applicable call charges on numbers not prefixed by usual "landline" STD Codes. Information can be obtained from the operator or the white pages. Before giving out ANY information regarding cars, or any other items for sale, please satisfy yourself that any potential purchaser is bona fide.

Directors of the Board of Porsche Club GB, Club Office Staff, Register Secretaries and Regional Organisers are often requested by Club members to provide information on matters connected with their cars and other matters referred to in the Club Rules. Such information, advice and assistance provided by such persons is given in good faith and is based on the personal experience and knowledge of the individual concerned.

Neither Porsche Club GB, nor any of the aforementioned, shall be under any liability in respect of any such information, advice or assistance given to members. Members are advised to consult qualified specialists for information, advice and assistance on matters connected with their cars at all times.

© 2020 APG vNext Commercial Version 4.6