Rotating assy balance

Tays340 said
I admit I have no clue.
The #6 cap is virtually unmolested while #5 cap weighs 20 grams less. Yes, I measured it 3 times. I just don't see how those two rod ends came close to weighing the same. I would feel better if all the caps were sharpied, ...maybe. I was expecting some caps to be worked but... If I put the assy's together the way I stamped them the weights are within 8 grams lo-hi. What's that? 3 post-it notes. As far as swapping the caps around, eesh. Again, he only marked four. View attachment 1715747937 View attachment 1715747938 View attachment 1715747939 View attachment 1715747940 View attachment 1715747941 View attachment 1715747942

Maybe this is why the old man acted like he wanted to hire me after asking me to explain how to balance a rotating assy.

I’m saying that is perfectly normal. You just can not weigh that stuff apart like you are. It’s the visual thing that’s got you going. That’s 100% NORMAL. On some of the balance jobs I’ve done I had to use core rod I had laying around to get a set I could balance.

Put the caps back on the rods they came off of, put it together and send it.

If you can’t sleep with that option, then you have to do what I said above and take the rods off the pistons, weigh all that stuff correctly and check the crank. You’ll be doing another balance job essentially.