Factor reject motor?

[Keith M]

Could it be possible that I have one?
Bought this motor used with 99,000 miles. It had what appeared to be a noisy top end so I had it rebuilt. I had the shop drill and tap a broken timing belt cover bolt and they found it to be 0.040" off center from the camshaft. They had to plug the original holes and re-drill and tap them. Noise persisted so I pulled the head head again and had it checked. No problems with the head but I still had the same noise after install.
Next, I pulled the pan and the IE crank scraper only to find the the crank was walking about an 1/8 of an inch ( nice grooves in the scraper )
The motor is quiet at idle and while cold. It only occurs above 1700 rpm and when you lift on the throttle.
Any ideas what could cause this?

Keith

[BeirBrennerE30]

it is possable to get a messed up motor from the factory but i have no idea if thats what you have or just shitty upkeep from a PO or crappy work from a shop.

3000 miles after i bought the car brand new from BMW the engine needed to be rebuilt. thanks for warrenties

[mikeedler]

it is most definetly the center crank bearing is shot the axial(back and forth) bearing is worn it is shaped like a U, and the crank can be pushed back and forth when the sides of the U have incorrect tollerances.-- bet it gets louder and quieter as you pust the clutch pedal.

with 100,000 miles, how could it be a factory defect?
0.040 is not very much for a bolt on a cover- but I am not too sure what bolt your talking about.

I would say that your shop didnt do the best work.-- from what I understand.