[JFP in PA]

A couple of comments on the various "systems":

Having done our share of IMS retrofits, some observations have developed. Every factory IMS bearing we have ever pulled had a lot of oil behind it in the shaft, that comes flooding out when the bearing is extracted. That bothers me as it means even otherwise perfect factory IMS bearings are allowing oil to at least partially fill the shaft, which can lead to shaft imbalance and harmonics, which cannot be doing the factory bearing any good. Both the EPS and DOF systems do nothing to address this problem; and the EPS actually wants you to punch a crude hole in the sealing plug on the oil pump end to let even more oil into the shaft, while the DOF is flooding the factory bearing with oil, which should also lead to more inside the shaft as well. This somehow does not seem like a good idea.

Every IMS Solution we have done, which while not as numerous as the more conventional IMS retrofits, have resulted in a common comment from the owner the next time we see them: The engine feels smoother. I have often wondered if this is because part of the Solution package is the insertion of a sealing plug behind the new solid IMS bearing, which prevents oil intrusion into the rest of the shaft and subsequent shaft harmonics. While only speculation at this juncture, it is enough to make you stop and think.

And for the earlier poster who commented that there are no dual row IMS Solutions, they are available now, we just finished installing one.