IMS bearing?
08-28-2013, 06:48 PM
#31
08-29-2013, 10:33 AM
#33
I disagree. If the clutch wasn't slipping then keep the set together until it's time to change it. I've seen and had flywheels that lookedlike this and yet worked perfectly fine.
To the OP, was this CH bearing installed in a marginal or healthy engine at the time? Cant expect even a CH bearing to survive if the engine was already contaminated by a IMSB failure. I know you said the original was OK and the LNE CH only has 60K miles on it but I think even LNE calls it a service item now. The LNE is just a CH version of the original, nothing special. If you put 60K miles on the LNE bearing, youve already exceeded their recommended replacement mileage.
I would think anyone with a M96 better just be prepared to at least inspect and/or R&R the IMSB every 30K to 50K miles unless there is something obvious indicated sooner. If you cant handle that, youve bought the wrong car. I suppose an owner could just drive in ignorant bliss and risk failure if they can afford a $20K engine for a $15K to $25K car.
Last edited by KrazyK; 08-29-2013 at 10:55 AM.
08-29-2013, 12:37 PM
#34
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To the OP, was this CH bearing installed in a marginal or healthy engine at the time? Cant expect even a CH bearing to survive if the engine was already contaminated by a IMSB failure. I know you said the original was OK and the LNE CH only has 60K miles on it but I think even LNE calls it a service item now. The LNE is just a CH version of the original, nothing special. If you put 60K miles on the LNE bearing, youve already exceeded their recommended replacement mileage.
If you cant handle that, youve bought the wrong car. I suppose an owner could just drive in ignorant bliss and risk failure if they can afford a $20K engine for a $15K to $25K car.
08-29-2013, 12:56 PM
#35
It was replaced proactively (the engine was healthy) when the clutch assembly required service (throw-out bearing was damaged/worn). The original bearing which accumulated 60k miles on it was like new when removed, no significant axial or radial play (it was and still is very tight). The LNE ceramic hybrid bearing has accumulated 35k miles or so.
I have owned this car for over 12 years.
I have owned this car for over 12 years.
08-29-2013, 02:13 PM
#36
I would think anyone with a M96 better just be prepared to at least inspect and/or R&R the IMSB every 30K to 50K miles unless there is something obvious indicated sooner. If you cant handle that, youve bought the wrong car. I suppose an owner could just drive in ignorant bliss and risk failure if they can afford a $20K engine for a $15K to $25K car.
Now that it's becoming more and more obvious that the insertion of hybrid bearings (or other "solutions") is blowing cars up right and left there is little remaining doubt about the efficacy of these "fixes." Banging on the intermediate shaft is NEVER a good idea. The journal tolerances are measured to the thousandths of an inch at the factory. It's all but guaranteed that insertion of a replacement bearing will take the shaft out of factory spec. From there it's a crap shoot how long it goes. I would never even consider purchasing a car with an after-market bearing in it. Every single one of them is a time bomb.
08-29-2013, 08:45 PM
#39
Three Wheelin'
Imre, my thinking is that you have the trans out anyway. The car is older, why not replace it while your that far into it?
To the OP, was this CH bearing installed in a marginal or healthy engine at the time? Cant expect even a CH bearing to survive if the engine was already contaminated by a IMSB failure. I know you said the original was OK and the LNE CH only has 60K miles on it but I think even LNE calls it a service item now. The LNE is just a CH version of the original, nothing special. If you put 60K miles on the LNE bearing, youve already exceeded their recommended replacement mileage.
I would think anyone with a M96 better just be prepared to at least inspect and/or R&R the IMSB every 30K to 50K miles unless there is something obvious indicated sooner. If you cant handle that, youve bought the wrong car. I suppose an owner could just drive in ignorant bliss and risk failure if they can afford a $20K engine for a $15K to $25K car.
08-30-2013, 01:47 AM
#40
You have a SR bearing so I assume thats the one you want to know about? I dont know squat about the DR but I know all the specs on the OEM SR if thats what your asking. Ditto on the LNE SR too. I researched the $%^& out of the SR bearing before I decided what to use.
The OEM Porsche single row bearing is an off the shelf crappy $12 bearing. I can prove it if you care to believe the facts. It has seals that were meant to keep out dust and dirt not hot motor oil. Why do I feel like this is a repeat?
The OEM Porsche single row bearing is an off the shelf crappy $12 bearing. I can prove it if you care to believe the facts. It has seals that were meant to keep out dust and dirt not hot motor oil. Why do I feel like this is a repeat?
09-11-2013, 09:04 PM
#43
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Finally had some time to inspect the flange and dissect the bearing. There is considerable spalling on the inner ring outer raceway (just half of the raceway), about 120-135 degrees. There is also some wear on the outer ring outer raceway. There is no wear at all on the inner raceway.