***Non-Turbo 996 owners - Please read - IMS DATA REQUIRED***

[Alex]

Cheers members :thumb:

 

[drabux]

I do wonder whether the prevalence of the C4s is to do with the fact that >2002 went with the single row ball bearing design, which all c4s had. Early 3.4 996s had the double row and, in the opinion of some, are more durable. So the issue is pre 2002 or post 2002 rather than some thing specific to the c4s. Just a suggestion...

 

[Alex]

Single-row bearing, 16k mile/2 year service intervals, minimal use, manufacturing tolerances, assembly issues, poor ownership care, non recommended oil, etc.

A+B+C+D+E+F+G= H Bomb!

They went to a single row bearing around 2000.

 

[P17BOG]

date inputted: 19/06/15
member: P17BOG
model: 996.1 C2
engine size: 3.4
purchase date: 21/05/15
date registered: 01/01/98
mileage (at purchase): 96546
mileage (now): 96690
bearing (orig./replacement): Original
failure data (if applicable): N/A
comment: new owner for last 4 weeks, no noticeable issues as yet

 

[4b4]

date inputted: 25/06/15
member: 4b4
model: 996.2 C4S Cabrio
engine size: 3.6
purchase date: 07/06/15
date registered: 20/01/05
mileage (at purchase): 82,283
mileage (now): 82,680
bearing (orig./replacement): N/K
failure data (if applicable): N/K
comment:

 

[Alex]

:thumb: thanks.

 

[ScoobyDoo555]

date inputted: 25/06/15
member: ScoobyDoo555
model: 996.1 C4
engine size: 3.4
purchase date: 10/09/14
date registered: 26 May 2000
mileage (at purchase): 84000
mileage (now): 102000
bearing (orig./replacement): Replacement
failure data (if applicable): NO failure
comment: Replaced out of caution whilst engine being rebuilt due to bore score.
ADDITIONAL - Hartech reported NO issue or play with the original bearing. It was perfect. Replaced out of caution anyway.

 

[Alex]

Whack you reg in here and select porsche, it'll tell you registered date: https://www.vehicleenquiry.service.gov.uk/

 

[ScoobyDoo555]

Done

 

[Alex]

:thumb:

 

[Alex]

Data collected so far for 77 cars (25th June 2015).

Here's a couple of bar charts showing which engines and models have sustained a failure:

Total number of failures - 7.8% (Not including the LN as a original failure)
of which 3.4 - 0% and 3.6 - 10.9%
of which all X51 - 0%, C2 - 10.5% and C4S - 12.9%

Last reported failure was July 2014 (not including the LN failure).

 

[SteveU1959]

date inputted: 18/07/15
member: SteveU1959
model: 9962 C4S
engine size: 3.6
purchase date: 13/07/15
date registered: 01/09/03
mileage (at purchase): 47000
mileage (now): 47000
bearing (orig./replacement): Original
failure data (if applicable):
comment:

 

[csubtil]

Re: ***Non-Turbo 996 owners - Please read - IMS DATA REQUIRE

date inputted: 18/07/2015
member: csubtil
model: 996.2 C4S Cab
engine size: 3.6
purchase date: 10/11/2012
date registered: 12/02/2004
mileage (at purchase): 68.000
mileage (now): 78.000
bearing (orig./replacement): Original
failure data (if applicable):
comment: don't plan to upgrade the bearing as in my opinion, a "botched" IMSB replacement has a higher % risk than the original IMSB

 

[jerzybondov]

date inputted: 18/07/2015
member: jerzybondov
model: 996.2 40th Anniversary
engine size: 3.6 X51
purchase date: 26/05/2015
date registered: 02/03/2004
mileage (at purchase): 87,000
mileage (now): 87,800
bearing (orig./replacement): Original
failure data (if applicable):
comment: don't plan to upgrade the bearing on the principle that if it was going to go pop it would have done already.

Some further discussion here on IMS bearing failure.
http://rennlist.com/forums/996-forum/572305-996-40th-anniversary-edition-registry-and-faq.html

Elsewhere (I think on this forum?) I've read some technical chat too about extra cooling with X51 reducing probability of cylinder 6 bore score and better lubrication reducing chance of IMS. But would need a big sample to verify.

 

[tonemalone]

IMS data

date inputted: 01/07/15
member: tonemalone
model: 996.2 C4S
engine size: 3.6
purchase date: 20/05/15
date registered: 29/10/2003
mileage (at purchase): 55,313
mileage (now): 56,678
bearing (orig./replacement): Original
failure data (if applicable): N/A
comment: I had the car checked over at purchase and it passed with flying colours, apart from needing new exhaust mounts. So all good so far.