Turbo rebuild - bearing races scored? - PeachParts Mercedes-Benz Forum

Diesel911 · #4 07-05-2020, 07:58 PM

Quote:

Originally Posted by OM617YOTA

Finally getting around to doing a turbo rebuild. To minimize vehicle down time, I'm rebuilding the turbo off my spare engine, and will then swap turbos on the truck when complete. I'm using the kit and manual from that source for Mercedes parts.

The manual states that if the bearing races are scored, the center housing must be replaced. One side of mine is lightly scored, only in a small section, not even half a rotation. This is the bearing race, not the bronze bushing. I can see the scoring, but I can't feel it with my finger tips. I can't get my fingernail on it but if I stick a plastic WD40 or carb cleaner straw down there, I can feel it with the straw but it doesn't catch. 98% sure it would be fine, but would hate to do all this work just to blow it up in the end for something stupid like this. I didn't think to get pics last night, I'll do so and post them ASAP, as obviously this is kind of dumb to ask without pics.

I searched but couldn't find anything on this forum, or on the internet in general. Does anyone have pics of scoring that is definitely bad, or pics of bearing races that are scored but still fine that I could compare to?

Worst case scenario, does anyone have a known good Garret center housing for a 617 they'd sell me?

I would like to know what Manual you are using. If it is a good one post the torque of the Shaft Nut please.

There is bearing bores in the Bearing Housing and there is bearing journals on the Turbine Shaft and there is a bore that the Seal rids in on the Aluminum Plate that is on the Compressor side.

Note that some are not going to like my resonse.
I worked in a shop were rebuilt Garret (Air Research), Schwitzer and Cummings Turbochargers. Concerning Turbos with the free floating bearings like the Garret ones and the bearing bores if there was marks that went around the bore we would use 500 crocus cloth (that is what the called it) and clean up the bore. If there was a small scratch around the bore and no metal was raised above the bore we reused it.

If it was really bad we sent the housing out and had them hone it out for an oversized outside diameter bearing.

It would be better to see a picture. Note what you cannot have is any scratching across the bore. That will destroy a bearing.