The air pump on a friend's 92 190E 2.6 is really noisy. I suspect the front bearing is out. I checked in the fiche, and bearings are available for the V8s like the 4.2 and 5.6, but the 2.6 engine pump is not serviceable. Has anyone changed the bearing in one. I don't want to disable the car until I know. A rebuilt is quite expensive. I'm not charging him anything, because he is a friend, and I'm actually interested in if it can be done or not. Thanks

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