IMS replacement dilemma
Registered User
Joined: Aug 2012
Posts: 35
From: Montreal, Canada
Rep Power: 15
My engine number is well before 05 69507475, therefore I went in fairly certain it had the small replaceable bearings. I was warned by Flintworks and LN Engineering, although rare, they have seen early 05's with the upgraded bearing. I ran the vin and engine number through my dealer, they were not able to determine if I has the updated bearing. The general consensus is most early production 997's have the small replaceable bearing, the only way to know for sure is to remove the tranny and determine it visually. This topic is also on rennlist, and through other's suggestion, i vrified with my build sheet that the motor is original to the car, and had never be replaced.
The upgraded bearing uses an IMS flange with a 22 mm nut. I'm assuming this is how your indie confirmed you have an upgraded bearing.
A 13mm nut is used on the smaller IMS bearing.
Registered User
Joined: Aug 2012
Posts: 35
From: Montreal, Canada
Rep Power: 15
As they say, you can't believe everything that you read on the internet. 
All 3.6L engines in the 997.1 from 2005 thru 2008 were the M96.05. Attached is the official list of all Porsche engines from 1952-2012 (see page 9).
https://dl.dropbox.com/u/93289189/Po..._1952-2012.pdf
.
All 3.6L engines in the 997.1 from 2005 thru 2008 were the M96.05. Attached is the official list of all Porsche engines from 1952-2012 (see page 9).
https://dl.dropbox.com/u/93289189/Po..._1952-2012.pdf
.
M96/05 (3.6L), had the smaller IMS in the early production run and then switched to the upgraded IMS.
M97/01 (3.8L), also had the smaller IMS in the early production run and then switched to the upgraded IMS.
Registered User
Joined: Aug 2008
Posts: 240
From: Michigan
Rep Power: 47
Okay, thank you. This is good information in line with what I have understood in the past. However, the information with certain M96 engines having larger bearings was new to me and (maybe there is no answer) I am wondering if there are other identifiers in the serial numbers so the engine doesn't have to be opened to check...maybe that just need to be done to ensure my peace of mind.
As they say, you can't believe everything that you read on the internet.
All 3.6L engines in the 997.1 from 2005 thru 2008 were the M96.05. Attached is the official list of all Porsche engines from 1952-2012 (see page 9).
https://dl.dropbox.com/u/93289189/Po..._1952-2012.pdf
.
All 3.6L engines in the 997.1 from 2005 thru 2008 were the M96.05. Attached is the official list of all Porsche engines from 1952-2012 (see page 9).
https://dl.dropbox.com/u/93289189/Po..._1952-2012.pdf
.
Registered User
Joined: Sep 2012
Posts: 142
From: DFW - Texas
Rep Power: 19
As they say, you can't believe everything that you read on the internet.
All 3.6L engines in the 997.1 from 2005 thru 2008 were the M96.05. Attached is the official list of all Porsche engines from 1952-2012 (see page 9).
https://dl.dropbox.com/u/93289189/Po..._1952-2012.pdf
.
All 3.6L engines in the 997.1 from 2005 thru 2008 were the M96.05. Attached is the official list of all Porsche engines from 1952-2012 (see page 9).
https://dl.dropbox.com/u/93289189/Po..._1952-2012.pdf
.
Registered User
Joined: Jul 2011
Posts: 1,115
From: Denver, CO
Rep Power: 79
I sent my 05 997 c2 off on Tues to get the IMS bearing retrofit done. I just got off the phone with my indie that my car has the revised m97 motor with the larger dual role IMS bearing, which is non serviceable without a tear down of the engine. I am impression the failure rate is significantly lower in m97's than m96's. I appreciate your guy's inputs!
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Registered User
Joined: Mar 2012
Posts: 110
From: Bay Area, CA
Rep Power: 19
C2 and not C2S? What is the build date on the car?
I am a little suprised as I have called LN before when looking at 2005s and the feedback I received is that they rarely have seen any 2005 C2 models that had the larger bearing from the factory.
The C2S model switchover was likely sometime around Feb/March 2005 on the build date (the black sticker in your driver's door jamb).
If they can't do the IMS and they are already in there you could replace the RMS to the newest seal to prevent future leaks, do the clutch and have the shop remove the seal on the IMS bearing for future splash lubrication.
I am a little suprised as I have called LN before when looking at 2005s and the feedback I received is that they rarely have seen any 2005 C2 models that had the larger bearing from the factory.
The C2S model switchover was likely sometime around Feb/March 2005 on the build date (the black sticker in your driver's door jamb).
If they can't do the IMS and they are already in there you could replace the RMS to the newest seal to prevent future leaks, do the clutch and have the shop remove the seal on the IMS bearing for future splash lubrication.
Registered User
Joined: Aug 2012
Posts: 31
From: Raleigh, NC
Rep Power: 15
To add to confusion, my '06 C2 Cab with a build date of October 2005 is listed (according to the Certificate of Authenticity) with an Engine Number: M96/03. Looking at the PET list, the M96/03 engines installed in 2005 are 320 horsepower. The PET list also has M96/05 Engines installed in 2005 on 997's (including Cabs) with 325 HP, which is the HP of '06 base Carerras. I guess I will try to see the engine number on the car tomorrow to verify what I have. Can anyone shed any light on this?
Registered User
Joined: Aug 2008
Posts: 240
From: Michigan
Rep Power: 47
At this point I can use a laugh. This image in my head comes to mind...Gunter, thinking about his hot date on Friday afternoon, quickly grabbed whatever nuts and bolts around him to put his last engine of the day together so he can get out early to see Katerina.
A few years later, bunch of guys on an internet forum cannot make heads or tails of what Gunter has done every Friday....The few engines that failed early were replaced under warranty, but a few manage to survive with evidence of Gunter's handiwork with larger bearings...
A few years later, bunch of guys on an internet forum cannot make heads or tails of what Gunter has done every Friday....The few engines that failed early were replaced under warranty, but a few manage to survive with evidence of Gunter's handiwork with larger bearings...
Registered User
Joined: Jun 2008
Posts: 1,342
From: USA
Rep Power: 104
I sent my 05 997 c2 off on Tues to get the IMS bearing retrofit done. I just got off the phone with my indie that my car has the revised m97 motor with the larger dual role IMS bearing, which is non serviceable without a tear down of the engine. I am impression the failure rate is significantly lower in m97's than m96's. I appreciate your guy's inputs!
http://www.lnengineering.com/ims.html
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