It makes a god awful noise doesn't it? Youd swear that there was something broken.

Toss away the old bolts, get some 12.9 tensile bolts or capscrews.
run a tap through the holes in the crankshaft, to remove any old locktite etc.
Blow it out with compressed air.
Spray locktite primer solvent into the holes, and get all grease etc out.
Check the inside of your flywheel. All that flapping around damages the mating face. It would pay to have it trued up in a lathe. (If this happens too often, the end of the crank frets, and it never really fits as snug again.
Follow the locktite directions to the letter.
Them get it dyno'd!!!!

FERAL,
By dowling, do you mean drilling three holes (evenly spaced for balancing) through the flywheel, and into the crank, and driving in some roll pins?

speaking of fly bolts, whats the go with the spacing of them, there all over the place, i was un aware of this and when i put mine back on it was like, "ok, why dont these line up" so i turned it a few times and it worked, why are they like that?

I noticed that too Tom210, when My Dad and I converted "The Defect" ('77 aussie 120Y 4 door sedan) from a 3N71B ( 3 speed auto), to a F4W60L car ( 4 speed manual) we also noticed that there is only ONE way that the flywheel will fit! - otherwise the bolts don't line up!, there are TWO different crank spiggot sizes too

even though "the Defect" is a manual now it has the auto AND manual spiggot bushes as I had Dad machine the flywheel to the larger spiggot size - and so it would clear the auto spiggot bush- Yes, The auto spiggot bush is still there to ensure that the flywheel doesn't go "on a holiday via leg"

A14force,
I get steel shaft turned down to the same dimension as the drill hole, cut the roll pins to length chamferer theends and tap them in to the holes with loctite (601) shaft fit.

Quote:
Feral
You are refering to solid steel dowels & not hollow center, split-along-the-length "roll pins", right?

WHAT??? no detailed story/history lesson on how,what and why 'roll pins' got their name? Damn that sucks.