I'm working on an S5 swap in my FB and I made a bulk parts purchase including s4 and s5 engine parts. I need some help determining which of these are usable and which should be replaced

1. Housing - one of them has a slight knick in the edge, which tapers out just about where the coolant seal is, almost like the housing was dropped on a hard edge. I am pretty sure this housing is junk. Opinions?



2. E-shaft. Some surface rust. I heard you can clean this up but I am not sure how and if it's safe



3. Rotor bearings. Rotors look good to me but the bearings have some corrosion. Is there a safe solvent that might get rid of it, or should I just get new bearings?


4. Center iron. I have a slight scratch, 2-3" long and just enough to catch a fingernail on in the top of the center iron face. I am attempting the 180 grit/400grit DA sander method to resurface the irons without removing the nitride coating but I doubt it'll remove this scratch. Should I replace the iron? (pic coming soon... I forgot this one)

 

The rotor housing, it depends here the nick is, and what your goals are for the engine, If the damage is not right in the compression area, I would cleanup the chrome surface with a flap wheel, stone down the aluminum casting and give it a try, think about the amount of material they take out of that edge for a bridge port. The eccentric shaft would clean up with a scotch Brite pad, the rotor as well.
For me, I would run those parts, and they would run fine. Especially if it's a budget rebuild for yourself. However, if I were paying for a rebuild, I would expect better parts than these.

 

Finally got a picture of the iron. After sanding with a DA I can't catch the scratch with my fingernail anymore but I can still feel it. Useable? This center iron already has about 0.003" of step wear anyway (within spec but not by a lot).

The previous own told me his last build made it a few hundred miles before losing a coolant seal, so I'm going to pass on this housing and find another. I'm guessing this defect caused the failure