The IMS discussion thread (Read this first!)
08-08-2020, 12:45 PM
#511
Rennlist Member
How do you know this, please explain. Can you quantify it and explain where these forces come from?
And I hope you are aware that in the engineering process there is also real life testing, an important part. What engineering basically does is help you minimise unforeseen issues during the testing part, rapidly accelerating time to develop stuff.
Then ONLY thing I wanted to know was: Is the bearing strong(load vs life) enough or not. Answer is: yes, it is.
Knowing this makes a lot of difference. I don't need a stronger bearing, just needs to be protected. And seeing that some cars go very long indicates that it's basically boils down to taking care of your car. Unless you had a faulty bearing for whatever reason from the beginning hence you might want to inspect it.
If you value real life on road testing, i highly doubt anyone comes close to hours/miles that Porsche did during the development.
And I hope you are aware that in the engineering process there is also real life testing, an important part. What engineering basically does is help you minimise unforeseen issues during the testing part, rapidly accelerating time to develop stuff.
Then ONLY thing I wanted to know was: Is the bearing strong(load vs life) enough or not. Answer is: yes, it is.
Knowing this makes a lot of difference. I don't need a stronger bearing, just needs to be protected. And seeing that some cars go very long indicates that it's basically boils down to taking care of your car. Unless you had a faulty bearing for whatever reason from the beginning hence you might want to inspect it.
If you value real life on road testing, i highly doubt anyone comes close to hours/miles that Porsche did during the development.
It makes no sense to do all that's needed to access the IMSB and not replace it! The big expense is getting to the bearing, not the cost of the replacement IMSB.
Who decided that 15,000 mile oil changes was a good idea, an engineer?
08-09-2020, 01:59 PM
#512
Race Director
My daughter is looking at 2 996 Cabriolets in the Sarasota/Tampa area. I have a 2001 996 with the aerokit. When I bought my 996 about 10 years ago I looked at the IMS numbers and determined that it was on the good list plus it's a 3.4. I have now lost the link to the IMS S/N list. I'm not complaining but it used to be easy to find in here. Can anybody point me in the right direction of the 996 IMS S/N list? Also any feedback on the Porsche Dealer in Tampa?
08-09-2020, 06:11 PM
#513
Racer
With all due respect, the problem is, you don't know the full history of the car unless you're the original owner...You can't inspect the bearing unless you can see and touch it right? So why not replace it and start fresh once you're in there?
It makes no sense to do all that's needed to access the IMSB and not replace it! The big expense is getting to the bearing, not the cost of the replacement IMSB.
Who decided that 15,000 mile oil changes was a good idea, an engineer?
It makes no sense to do all that's needed to access the IMSB and not replace it! The big expense is getting to the bearing, not the cost of the replacement IMSB.
Who decided that 15,000 mile oil changes was a good idea, an engineer?
Many people have been in the same situation(for any kind of mechanical thing): why not replace it when it's just in front of you? The two issues with this: Can you properly install it? and is the new part free from manufacturing issues?The old part have been in operation and possibly proven to be good. The odds: Is the old bearing going to be more reliable than a new bearing and it's installation. Looking at the M96(with the small 6204 bearing): The 6204 are mass produced and the risk of receiving a faulty bearing is minimal. The risk is that you may contaminate or/and not install correctly. For high reliability the faulty part/contaminate/incorrect installation is a higher risk than to keep the old part if it shows no signs of wear or damage...tho the difference here might be marginal.
Regarding the 15,000mile oil change. Yeah, I tend to agree with you on that one but if you read the manual they say shorter intervals for sever driving conditions. 15,000mil is the maximum...which plenty of owners have regarded as the de facto change interval.
Porrsha:
There is no IMS S/N list for the original bearings which is reliable. The general consensus is that cars built 98/99 have the dual row bearing which have had less issues than the later(00 some time and later) single row. The IMS bearings is just one part of the car and let it not decide which car to get. Later cars have many improvements on the engine and other wise. Which ever 996 you get, it's a good idea to have the bearing inspected (if not already done) and replace it(with the same type) if it show any sign of damage or wear. Edit: maybe you where thinking about this one https://rennlist.com/forums/boxster-...-mar-12-a.html
Last edited by Nick_L; 08-09-2020 at 06:17 PM.
08-09-2020, 07:02 PM
#514
Rennlist Member
My daughter is looking at 2 996 Cabriolets in the Sarasota/Tampa area. I have a 2001 996 with the aerokit. When I bought my 996 about 10 years ago I looked at the IMS numbers and determined that it was on the good list plus it's a 3.4. I have now lost the link to the IMS S/N list. I'm not complaining but it used to be easy to find in here. Can anybody point me in the right direction of the 996 IMS S/N list? Also any feedback on the Porsche Dealer in Tampa?
09-13-2020, 01:41 AM
#515
Intermediate
I recently replaced it immediate shaft bearing and used set screws as a back up for the cam lock such. I noticed, while bumping in the new bearing in place that the set screws had to be continuously tightened to maintain the position. Does anyone know if this means the intermediate shaft has been pushed backwards? Logic dictates that it has. But my question is, will it return to its original position under normal operating conditions?
09-13-2020, 11:15 PM
#516
Edit: maybe you where thinking about this one https://rennlist.com/forums/boxster-...-mar-12-a.html
For example:
7 is after 3, yet the first in the range.
So... X comes before 2 here?
3 is after 2, but first in the range
Luckily, my VIN looks like it is in a clear range: WP0AA29961S.... in the range of
09-25-2020, 11:50 AM
#517
This is a reoccurring question so i might just answer that.
An engine builder/assemblers task is to put an engine together, tear down and build up. Much like you learn in the army to take apart your gun and put it together you need practice working with it to become good. An engineers task is to construct and design the engine, the more you do it the better you become. To do this you don't need to see the engine(but it might help some times), you just need to understand how an engine should be built. Think about it. The team which design the M96(or plenty of other engines) only got to see it some years after they started their design work. You can't tear apart and build something that does not exist.
Builders and engineers both work on the same stuff but in different ways.
Circling back to the IMS bearing. Since I own a 996 (my second) and I have the general layout of the chain drives etc etc I can easily analyse it. Engineering work. No need to build or tear apart, it is not relevant for this work. Actually I'm doing it to avoid tearing it down or having problems with it...or throwing my money away on useless stuff. I think it's not just me who is interested in that.
An engine builder/assemblers task is to put an engine together, tear down and build up. Much like you learn in the army to take apart your gun and put it together you need practice working with it to become good. An engineers task is to construct and design the engine, the more you do it the better you become. To do this you don't need to see the engine(but it might help some times), you just need to understand how an engine should be built. Think about it. The team which design the M96(or plenty of other engines) only got to see it some years after they started their design work. You can't tear apart and build something that does not exist.
Builders and engineers both work on the same stuff but in different ways.
Circling back to the IMS bearing. Since I own a 996 (my second) and I have the general layout of the chain drives etc etc I can easily analyse it. Engineering work. No need to build or tear apart, it is not relevant for this work. Actually I'm doing it to avoid tearing it down or having problems with it...or throwing my money away on useless stuff. I think it's not just me who is interested in that.
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09-29-2020, 01:39 PM
#518
1st Gear
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Hi, I am new to the forum, and I am in the search of a 987.1 Cayman 2006-2008. I read a lot about the IMS issue but I would like some feedback on the following statement found online.
"Porsche models are prone to IMS failure and would benefit from an IMS upgrade....987 Cayman & Boxster models up to engine number 61504715"
Is this true? if it is, what did Porsche do differently on M97 engines after engine number 61504715? Is it only for the BASE model or also for the S?
Thank you!
"Porsche models are prone to IMS failure and would benefit from an IMS upgrade....987 Cayman & Boxster models up to engine number 61504715"
Is this true? if it is, what did Porsche do differently on M97 engines after engine number 61504715? Is it only for the BASE model or also for the S?
Thank you!
09-29-2020, 04:49 PM
#519
Nordschleife Master
Hi, I am new to the forum, and I am in the search of a 987.1 Cayman 2006-2008. I read a lot about the IMS issue but I would like some feedback on the following statement found online.
"Porsche models are prone to IMS failure and would benefit from an IMS upgrade....987 Cayman & Boxster models up to engine number 61504715"
Is this true? if it is, what did Porsche do differently on M97 engines after engine number 61504715? Is it only for the BASE model or also for the S?
Thank you!
"Porsche models are prone to IMS failure and would benefit from an IMS upgrade....987 Cayman & Boxster models up to engine number 61504715"
Is this true? if it is, what did Porsche do differently on M97 engines after engine number 61504715? Is it only for the BASE model or also for the S?
Thank you!
10-01-2020, 03:47 PM
#520
Intermediate
I have recently decided to purchase a 996 and therefore have Been researching the IMS and bore scoring issues ( my head is swimming). Based on the recommendations that higher revs operation would lessen the chance of bore scoring my question is how does a manual vs auto transmission play into this?
10-01-2020, 03:53 PM
#521
Nordschleife Master
I have recently decided to purchase a 996 and therefore have Been researching the IMS and bore scoring issues ( my head is swimming). Based on the recommendations that higher revs operation would lessen the chance of bore scoring my question is how does a manual vs auto transmission play into this?
https://www.youtube.com/playlist?lis...iZKhfNjeTXaRkn
10-02-2020, 12:17 PM
#522
Rennlist Member
I have recently decided to purchase a 996 and therefore have Been researching the IMS and bore scoring issues ( my head is swimming). Based on the recommendations that higher revs operation would lessen the chance of bore scoring my question is how does a manual vs auto transmission play into this?
12-21-2020, 10:10 AM
#524
Rennlist Member
12-21-2020, 11:24 AM
#525
Intermediate
I used it in a pinch and it worked for me. I was concerned though that as I snugged down the set screws the IS was pressed back a bit. I can tell you that the Porsche tool is available for rent. I went through Glenn at Specialty Auto Tool Rental.