View Poll Results: did YOUR car suffer an IMS failure
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IMS failure for your 997 car, Y or N? tell us (yr, 997.1, .2, m96, m97, failure mode)
05-01-2019, 10:59 AM
#1021
On the 05 the transaxle does not have to be dropped to perform a visual inspection of the IMS bearing flange, to determine which bearing the engine has. A bore scope with a 5.5mm tip, or smaller can be used to clearly see the IMSB flange, when inserted through a specific piece of real estate between the engine, and transaxle.
I suppose I should show this in a Rennvision technical video on the topic. I don’t think anyone else has figured it out. (imagine that :-)
Watch this low mileage car. Inspect it more closely than a high mileage car, and that means following my procedure in the 4th video of the bore scoring video to ensure that no scoring is occurring. You cannot be careful enough. Don’t have blinders on simply due to the mileage, that is a huge mistake. With 26k miles the car was not driven enough to show any issues.
I suppose I should show this in a Rennvision technical video on the topic. I don’t think anyone else has figured it out. (imagine that :-)
Watch this low mileage car. Inspect it more closely than a high mileage car, and that means following my procedure in the 4th video of the bore scoring video to ensure that no scoring is occurring. You cannot be careful enough. Don’t have blinders on simply due to the mileage, that is a huge mistake. With 26k miles the car was not driven enough to show any issues.
Are you able to share the procedure to check the bearing on a 05 without removing the transaxle. I own an 05 I want to check.
thanks
05-01-2019, 11:10 AM
#1022
Former Vendor
05-10-2019, 10:11 AM
#1025
RL Community Team
Rennlist Member
Rennlist Member
For 3.8L motors, up to M97/01 68509790 has the smaller IMS bearing and Engine number from M97/01 68509791 has the larger revised IMS.
so this is probably a small bearing and smaller IMS shaft early car, but with any 05 the only guarantee as to what's in it is to examine the bearing flange and see which size nut it has.
05-10-2019, 10:17 AM
#1026
The G you have in the middle is actually a zero
For 3.8L motors, up to M97/01 68509790 has the smaller IMS bearing and Engine number from M97/01 68509791 has the larger revised IMS.
so this is probably a small bearing and smaller IMS shaft early car, but with any 05 the only guarantee as to what's in it is to examine the bearing flange and see which size nut it has.
For 3.8L motors, up to M97/01 68509790 has the smaller IMS bearing and Engine number from M97/01 68509791 has the larger revised IMS.
so this is probably a small bearing and smaller IMS shaft early car, but with any 05 the only guarantee as to what's in it is to examine the bearing flange and see which size nut it has.
Anyhow I have 1 year warranty to figure out what to do.
Currently 30000miles 2005 997.1 no IMS issue
05-10-2019, 03:13 PM
#1027
I believe some feel that the smaller bearings are better, because they are easier to replace. I don't want to create an argument, but there have been reports that the later, larger bearings have experienced failures. (See the comments I posted above in #998 from LN Engineering, who said it occurs, but very, very rare in the larger bearings)
05-13-2019, 02:31 PM
#1028
Just checked the engine number looks like something different as in maintenance booklet.
In my point of view M97/0168514644.
Looks like it has a bigger bearing, anybody any experience with mismatch between maintenance booklet sticker & number on engine itself.
05-13-2019, 03:08 PM
#1029
RL Community Team
Rennlist Member
Rennlist Member
If that's a different motor than the one originally in the car, it wasn't supplied by Porsche. A Porsche replacement motor includes the letters AT in the new engine serial #. It's possible the original engine failed and one of the owners replaced it with this current one, that by Serial # looks to be a larger bearing motor, but you never really know until you see the bearing flange nut.
05-13-2019, 03:28 PM
#1030
Ok I know what went wrong.
I orginally posted the number from this sticker, but I combined the engine & transmission number. Therefore I had G (getriebe) in my number.
The engine number from sticker is in fact M9701685, just a general number.
Thanks for the assistance, and with number about 4853 engine numbers later than engine number M97/0168509791. I think it has the larger IMS, thanks for the quick responses.
08-19-2019, 06:51 PM
#1032
Instructor
Mine is a 2006 997 C2S Cabriolet... Recently purchased with 40k miles, (now with 42k), so far engine strong, no issues.
08-24-2019, 01:03 PM
#1033
05 C2 33k miles no IMSB issues. My is a early model 10/04 built which is in the high risk category. ( 99.9 % sure smaller single roll bearings) I have read every page on here on this topic. Seems to have been more of a panic at first then at the present time, Year 10-15 compared to current year 16-19. I am looking forward to the LN solution replacement when doing the clutch but problem is clutch is solid with no signs of slippage or tightness. I’m hoping to hold off another 2/3 years 20k miles or so and get both worked on and replaced.
Seems to me with these smaller single bearings is, it’s either going to go soon 10-20k miles or rather then later 100k+ miles .. seems most of all if not all in that sweet spot were replaced in perfect clean running condition. Basically you start of a good sold bearing or a default bad bearing by bad luck .
The numbers are interesting. Early built 05 are probably in the 8-10% failure range. But problem with this is you have most coming on here when it fails and most with no fails are not hitting these forums. Perhaps bringing that number from 8-10% to 2-4%.. any latest update numbers are this from Porsche it self?
And with the failed ones are they all imsb failure to start with....
Am I crazy to wait ?
any thoughts?
Seems to me with these smaller single bearings is, it’s either going to go soon 10-20k miles or rather then later 100k+ miles .. seems most of all if not all in that sweet spot were replaced in perfect clean running condition. Basically you start of a good sold bearing or a default bad bearing by bad luck .
The numbers are interesting. Early built 05 are probably in the 8-10% failure range. But problem with this is you have most coming on here when it fails and most with no fails are not hitting these forums. Perhaps bringing that number from 8-10% to 2-4%.. any latest update numbers are this from Porsche it self?
And with the failed ones are they all imsb failure to start with....
Am I crazy to wait ?
any thoughts?
08-24-2019, 01:52 PM
#1034
RL Community Team
Rennlist Member
Rennlist Member
05 C2 33k miles no IMSB issues. My is a early model 10/04 built which is in the high risk category. ( 99.9 % sure smaller single roll bearings) I have read every page on here on this topic. Seems to have been more of a panic at first then at the present time, Year 10-15 compared to current year 16-19. I am looking forward to the LN solution replacement when doing the clutch but problem is clutch is solid with no signs of slippage or tightness. I’m hoping to hold off another 2/3 years 20k miles or so and get both worked on and replaced.
Seems to me with these smaller single bearings is, it’s either going to go soon 10-20k miles or rather then later 100k+ miles .. seems most of all if not all in that sweet spot were replaced in perfect clean running condition. Basically you start of a good sold bearing or a default bad bearing by bad luck .
The numbers are interesting. Early built 05 are probably in the 8-10% failure range. But problem with this is you have most coming on here when it fails and most with no fails are not hitting these forums. Perhaps bringing that number from 8-10% to 2-4%.. any latest update numbers are this from Porsche it self?
And with the failed ones are they all imsb failure to start with....
Am I crazy to wait ?
any thoughts?
Seems to me with these smaller single bearings is, it’s either going to go soon 10-20k miles or rather then later 100k+ miles .. seems most of all if not all in that sweet spot were replaced in perfect clean running condition. Basically you start of a good sold bearing or a default bad bearing by bad luck .
The numbers are interesting. Early built 05 are probably in the 8-10% failure range. But problem with this is you have most coming on here when it fails and most with no fails are not hitting these forums. Perhaps bringing that number from 8-10% to 2-4%.. any latest update numbers are this from Porsche it self?
And with the failed ones are they all imsb failure to start with....
Am I crazy to wait ?
any thoughts?
Personally, I would have it replaced with The IMS Solution and just do the clutch at the same time, even though it's early.
The following 2 users liked this post by Petza914:
JustinCase (09-18-2019),
Porto911 (08-24-2019)
