Harmonic balancer comes off

AJ/FormS said

I think the dent you are referring to is the counterbalance system.
The 5 little bolts may or may not be correct. The 6th one with the screwdriver slot should not be there, nor should the spiky washers.There should be 6 hexhead bolts with spring washers or Belvilles. The factory bolts had special captive washers. It's not real critical, until the pully comes off at 6000 rpm.
The 1/20 side wiggle, if I understand it correctly, says you have a junk part there, or maybe two.The damper should absolutely not slide onto the crank and then wiggle. Time to measure both.
Here's the thing; this interface is pretty important to the life of the engine, and so it makes me wonder where else corners were cut with this engine. I'm not trying to scare you, but this stuff IS scary.

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The last part of this is doubly important. You need to be looking very close at stuff and then measure everything.

Press fit is the amount of negative clearance between parts, in this case the diameter of the crank snout and the diameter of the hole in the balancer. Just for discussion, let's say the crankshaft measures 1.5000 exactly. Then to be correct the hole in the balancer must measure 1.4985-1.4990 giving you the correct press fit. Any more clearance and it will just slip on, any less and you have to heat it to get it on and you can split the hole at the key way.

FWIW the press fit is what holds the balancer on, and keeps it from turning on the crank. The woodruff key is only there to locate the balancer during assembly, which is why you MUST ALWAYS verify TDC and degree your camshaft every single time you put an engine together.