Jimmyrigged
On the wastegate
Crank was good
Crank was good
All of the above, but also check the crank straightness...be sure it is not bent?
If bent, I have seen wear being uneven across all the bearings and it can be seen even on just one bearing. The wear on your bearings could be a bent crank. Worth a check if its out.
Don't mean to hijack, hope it's relative to the thread. What about using STP as assembly lube?
I can't remember the name of the lube I use but it's a dark red color and I have never had a issue with it.
Now you got me worried about my eddy heads though
I'm still at a loss for what was actually done when you put it together with those bearings. Or am I confused, and you didn;t put it together?
Anyway - it looks to me like too much oil clearance, probably a lot of tpaer on the journals, and oil wedge break down as a result. That lets the crank shift around in the block, and in some cases pushes it in one direction or another, creating the wear you see. I'd expect to see more copper is the crank was bent, and a lot more heat in the bearings.
In my opinion you should be using the right tools to measure the crank for taper, and crank and and the bearing bores to calculate clearance. Plastigage will not show taper. If you have oil clearance greater than .0025 I'd look at running a bearing to take up some of that. I generaly like to have between .002-.0025 on the mains.
Snake Oil
Seriously, not a joke and I have some here.
Dark candy red and real thick and sticky.
Mic the crank mic the bearings assembled with caps. deduct for clearance clean every thing spotless good assembly lube should be fine. Has to be clean!
Taper is measured. You get the crank to 70° temperature and get a micrometer. You measure each journal at a minimum of two points accross the width of each journal. (note rod throws have 2 journals per throw) Taper will show up if you measure properly and consistently. Or - bring the crank to the shop that turned it (may not be where you paid for it) and have them chuck it up and run an Arnold gage on it. That will definately find any surface issues.
If the original crank was only polished when the engine was rebuilt there's a very good chance the journals had a bundh of taper. Usually the wear leaves it "in spec" but having some, then it's polished which makes what's there worse.