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IMS bearing failure for your 996, Y or N? tell us (yr, 996 Mk1 or MK2 failure mode)

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Old 12-05-2017, 01:24 PM
  #931  
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Originally Posted by Tim Cooper View Post
If it's been doing short trips i'd make sure the gearbox oil has been changed, I change at half the book distance and the oil comes out tired.

5k for engine oil could be slight overkill but see what you think at next change.
I will certainly add that to the list of things to check when I take it in for it's next service, in another 3k miles or so.

I'd just read from various sites and magazines that non-IMS replaced vehicles probably will have more longevity with a 5k service, but I know the book says 10k, so maybe if the next inspection comes out looking clean, I'll bump it up to 7k. I plan to only drive mine 2x a week or so.
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Old 12-05-2017, 08:05 PM
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Originally Posted by RSBro View Post
I will certainly add that to the list of things to check when I take it in for it's next service, in another 3k miles or so.

I'd just read from various sites and magazines that non-IMS replaced vehicles probably will have more longevity with a 5k service, but I know the book says 10k, so maybe if the next inspection comes out looking clean, I'll bump it up to 7k. I plan to only drive mine 2x a week or so.
Stick to 5K unless you can afford a $20K motor...
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Old 12-06-2017, 12:20 PM
  #933  
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Originally Posted by 808Bill View Post
Stick to 5K unless you can afford a $20K motor...
That's what would make me sleep better at night, and what everything I've read in Excellence, Total911, this forum, etc. have said for a non-changed IMS bearing.
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Old 12-09-2017, 12:59 PM
  #934  
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2003 C2 cab with 75k. Changed IMS as it needed a clutch (10% left). Original bearing looked fine. Went to the LN single row retrofit dual row pro.
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Old 12-09-2017, 01:08 PM
  #935  
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Originally Posted by NIACAL4NIA View Post
Vario-cam engines don't like thicker oils. My 2002 ran on 0w-40 and the bearing was fine at 90k. The original bearing is sealed. Porsche never approved 10w-Î. Too much Zddp can harm your catalytic converter.
Local race shop with a large fleet of 996 cars said same thing. They only run 0W40 MobileOne.
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Old 12-27-2017, 10:09 AM
  #936  
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Default 2000 C2 Cab

71k on original engine no issues
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Old 01-01-2018, 09:48 PM
  #937  
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Default 2000 Carrera C4

IMS Bearing upgraded at 153000 km. The old one looked fine (double row). Upgraded to a Direct Oil Flow bearing and oil line.
cheers
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Old 01-07-2018, 12:04 PM
  #938  
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IMS dual row replaced at 53,800 miles on an '00 C4. Looked perfect when removed. Replaced with IMS DOF from TuneRS
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Old 01-11-2018, 09:44 AM
  #939  
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A few guys at the local track run that IMS DOF from tuner RS. They seem to really like it.
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Old 01-11-2018, 08:59 PM
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'03 3.6. 61k stock single row IMS. Zero play tight as a virgin. Lots of life left. Replaced today with LN Engineering IMS Pro Retrofit, single row ceramic bearing

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Old 01-26-2018, 04:23 PM
  #941  
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Default 99 M96/Tip - 82300 miles - replacing

Rather than rely on the statistic someone gave me that the failure rate for the 1999 M96 mated up to a tiptronic was .4%, I took the car to my long time shop to get an LN replacement. It was the best decision yet. My guy at the shop said I should defitnitely buy a lottery ticket this weekend. The IMS bearing was intact, but there is about 1/8" of play - the beginning of the end. Caught it just in time before any badness happened.

We found a few small chain guide chips in the pan, so we're doing upper guides and maybe new tensioners. New rear main seal too, just in case. AND and air/oil separator...preventative replacement I guess. At least the water pump had already been replaced!

Dodged a bullet with the IMS.
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Old 01-26-2018, 04:31 PM
  #942  
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Originally Posted by Einsteiger View Post
Rather than rely on the statistic someone gave me that the failure rate for the 1999 M96 mated up to a tiptronic was .4%, I took the car to my long time shop to get an LN replacement. It was the best decision yet. My guy at the shop said I should defitnitely buy a lottery ticket this weekend. The IMS bearing was intact, but there is about 1/8" of play - the beginning of the end. Caught it just in time before any badness happened.

We found a few small chain guide chips in the pan, so we're doing upper guides and maybe new tensioners. New rear main seal too, just in case. AND and air/oil separator...preventative replacement I guess. At least the water pump had already been replaced!

Dodged a bullet with the IMS.
It sounds like this one should have failed pre- qualification.

Debris was found in the oil sump, along with what sounds like a Stage III bearing failure in process, yet the shop continued with the IMS Retrofit?

I am sure that LN Engineering will want to know what shop did this work. What was the shop's directives for you moving forward?
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Old 01-26-2018, 04:40 PM
  #943  
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Perhaps I did not state the facts correctly. Before we start a witch hunt on my local shop, there was no pre-buy inspection. A cardinal sin, yes...but the price had all this factored in. This was elective surgery. There was no metal in the sump, just enough plastic to warrant checking the upper guides. The bearing housing is undamaged, so whatever the hell a Stage 3 failure is - it was not happening. The IMS had a little wobble. It's in the shop to get it replaced and the removal found that it was time. The new LN bearing should have arrived yesterday. My guy has done many, many LN fits. More than qualified.

SO....I am going to leave it at that. If you want more details, you can send a private message and I may be able to supply more details.
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Old 01-26-2018, 04:47 PM
  #944  
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Originally Posted by Einsteiger View Post
Perhaps I did not state the facts correctly. Before we start a witch hunt on my local shop, there was no pre-buy inspection. A cardinal sin, yes...but the price had all this factored in. This was elective surgery. There was no metal in the sump, just enough plastic to warrant checking the upper guides. The bearing housing is undamaged, so whatever the hell a Stage 3 failure is - it was not happening. The IMS had a little wobble. It's in the shop to get it replaced and the removal found that it was time. The new LN bearing should have arrived yesterday. My guy has done many, many LN fits. More than qualified.

SO....I am going to leave it at that. If you want more details, you can send a private message and I may be able to supply more details.
He wasn't referring to a "pre-buy inspection" but to a detailed qualification process installers are supposed to conduct before replacing the bearing. Not sure if this is the most current checklist or not:

http://imsretrofit.com/pre-procedure-qualification/
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Old 01-26-2018, 05:13 PM
  #945  
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OK. Thanks for the clarification. Again, this shop is LN qualified and experienced. I regret posting, now.
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