Quote:
Originally Posted by ppbon
Do you have any pics of the vented IMS.
That was one of our routes to solve the issue, but was not further developed because it requires engine tear-down.
Good luck
Happy Boxstering
Pedro
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These videos explain my thoughts on why all IMS bearings run in oil, and not grease, and what to do about it. It's simply PV=nRT, with the pressure venting through the bearing seal. For those who don't speak perfect gas law, as the air temperature inside the shaft goes up when the car runs, air is forced from the inside of the shaft through the bearing grease seal, when the engine cools, air is forced back into the IMS through the bearing grease seal. The videos show that problem and the solution, and it could be done with the shaft in, but would take cleverly designed custom designed tooling to do it.
I used the pelican parts bolt (Thanks Wayne!) but chose a Nachi 6204 NSE s - the seal material is Viton instead of Buna-n - a little better material and it is a sealed bearing.
1 986 IMS Bearing Failure Mode - YouTube
3 Eliminating 986 IMSB Differential Pressure - YouTube
7 My IMS forward plan - YouTube