So a while back I noticed a slight growling noise coming from the rear of my 928. So, this season I thought that I would start by changing the rear bearings with NTN bearings. Got them apart and found a surprise on the driver's side. The diameter of the damaged area was small enough that the bearing was loose there (Like an 18-inch tire on a 14-inch rim). Not sure what they were trying to do Possibly a Chinese knurl (Maybe caused by a froze bearing??), but anyway they changed the bearing and put it back together as it was. I ordered another hub from Mark (928 331 065 07).

Has anyone else had experiences such as this?

This exact scenario, no. General shoddy work by individuals and some “reputable” shops, absolutely.

Most DIYers and an unfortunate selection of shops will do shoddy work and think it’s fine because “it works”.

This is why I trust very few people to work on my cars.

Sometimes owners decline the recommendations from mechanics.

There's that.

I agree with both of you. hopefully no one gets put into a dangerous position because of it. Not saying it was a dangerous situation for me. just a surprise.

I have seen this kind of hub damage before. One (of many?) possible explanations:

- RWB R&R'd, but new bearing inner face unsupported when pressing in hub
- New RWB thus destroyed as inner half of inner race pressed out.
- Shop doesn't notice / doesn't care
- New RWB fails almost immediately and damages hub spindle surface
- Next shop R&Rs RWB, discovers damage, doesn't care, hopes new RWB properly installed is "good enough."

Yup, I definitely agree Dave. The part that bothers me is the "doesn't care " and "Good enough". Wouldn't say that if they had to purchase the new hub and provide the labor (Cost of the lesson). Do it right, do it once.

Queue the excuse: "Wasn't me."

Closing in on 30 years of working on other people's 928s (and my own) it is very clear to me that many - if not most - shops work on cars as if a) they will never have to work on it again b) the car will change owners before whatever half-@zz'd repair is discovered and/or c) they will be able to shirk responsibility and don't GAF if that client comes back.

Very few shops will ever admit to mistakes and even fewer will rectify their mistakes.

Is it nature or nurture that creates the predilection for humans to attempt to hide and/or hide from their mistakes?

Not hiding makes, learning from them, and taking responsibility for them is learned behavior.

I don't recall ever doing a half-assed repair, myself.

(I learned that phrase from watching senate investigation hearings.)