Quote:
Originally Posted by stelan
Oem IMS bearings are very close in design to wheel bearings, they are permanently greased and have seals to prevent grease from going out, dirt from going in and oil from washing the grease out, when seals fail bearing will fail, think of a wheel bearing without the seals, it will fail quickly, It has been discussed a lot if the ones that actually failed it was due to bad oil that affects the seals or extreme pressure/ vaccum in cranckcase or just a bad batch, I would say if you are not replacing it do frequent oil changes, make sure you have a working AOS and drive it often.
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From experience, I really do not think that the AOS condition has much to do with oil intrusion of the OEM IMS bearing. For the most part, the seals just harden over time, and with the bearing partially submerged in oil, and the shaft itself cooling and pulling a very slight vacuum on the IMS bearing as the engine cools after shut off, slowly washing the grease into the shaft and out of the bearings. This is the reason that the every shaft we have ever seen during a retrofit is at least partially flooded with oil.