Who still has their original IMSB? And why?
07-05-2014, 06:15 AM
#17
Drifting
Join Date: Sep 2011
Location: Ephrata, PA, USA now. Originally from the UK
Posts: 3,075
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1999 C2 72000 miles original double row IMSB. Motul 100 Oil changed at 5000. No debris in filters. Don't have the magnetic drain plug anyway. Same clutch since I got the car at 45000 miles 3 years ago. The reason why I never worry is "It's a Porsche, there is no Substitute".
07-05-2014, 09:48 AM
#20
Three Wheelin'
98,000 miles. I believe there was a thread where a Porsche dealer mechanic stated he had done many many IMSB jobs, and said once you reach 60,000 miles, the probability of failure is almost nonexistent, and I am paraphrasing, but that was the general idea.
2002 Turbo - Basalt Black Metallic / 2003 Carrera 4S - Speed Yellow / 1955 356 Continental 1500 - Rust Red
2002 Turbo - Basalt Black Metallic / 2003 Carrera 4S - Speed Yellow / 1955 356 Continental 1500 - Rust Red
07-05-2014, 02:36 PM
#22
Burning Brakes
+1/2 ... I'd rather read everything, decide how worried I really need to be, and then just drive the damn car. Seriously, I think you described the anxiety curve for a lot of us ... starting with "what's an IMS?" to "OhmiGod it's a friggin' time bomb!" to "guess I'll get that done when I need a new clutch."
I negotiated my IMSB replacement with the purchase of the car, since it needed a new clutch. Otherwise, I think I'd just have waited until the clutch went.
I negotiated my IMSB replacement with the purchase of the car, since it needed a new clutch. Otherwise, I think I'd just have waited until the clutch went.
07-05-2014, 04:12 PM
#25
lol
Another IMSB thread.
In my job, I mitigate risk at every opportunity- so I changed mine with the clutch/AOS/RMS job. Turns out its a double row version...so that's awesome.
Another IMSB thread.
In my job, I mitigate risk at every opportunity- so I changed mine with the clutch/AOS/RMS job. Turns out its a double row version...so that's awesome.
07-05-2014, 04:21 PM
#26
Race Director
+1/2 ... I'd rather read everything, decide how worried I really need to be, and then just drive the damn car. Seriously, I think you described the anxiety curve for a lot of us ... starting with "what's an IMS?" to "OhmiGod it's a friggin' time bomb!" to "guess I'll get that done when I need a new clutch."
I negotiated my IMSB replacement with the purchase of the car, since it needed a new clutch. Otherwise, I think I'd just have waited until the clutch went.
I negotiated my IMSB replacement with the purchase of the car, since it needed a new clutch. Otherwise, I think I'd just have waited until the clutch went.
07-05-2014, 07:03 PM
#27
Race Director
07-05-2014, 07:43 PM
#30
Early-build '05 997 with small single-row IMSB. Bought it with 20K on it, clutch pedal was quite stiff, so at 32K I decided to do it and get the LN bearing at the same time. Original bearing was perfect, seals intact, grease inside. Over 20K on the LN bearing so far with no issues. I also have a B2B warranty for another 2 1/2 years.
But I agree the internet hype can make you crazy. The guys selling the DOF system claim the LN is not a solution, and even LN says the single-row retrofit isn't a solution either and should be replaced at intervals. But there comes a point when you have to say "enough". If there is a 92% probability the OEM bearing will go the life of the engine without even removing the seals, then my sensibility tells me the open ceramic LN bearing which withstands suboptimal lubrication should have a much higher probability of surviving to the bitter end. I can live with that.
But I agree the internet hype can make you crazy. The guys selling the DOF system claim the LN is not a solution, and even LN says the single-row retrofit isn't a solution either and should be replaced at intervals. But there comes a point when you have to say "enough". If there is a 92% probability the OEM bearing will go the life of the engine without even removing the seals, then my sensibility tells me the open ceramic LN bearing which withstands suboptimal lubrication should have a much higher probability of surviving to the bitter end. I can live with that.