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I'm pulling everything together to sending it off for balancing. I've lapped the flywheel onto the crank using some fine paste and a drop of oil. How far should I go, is this enough, should I keep going until I get an even grey finish or is this going to cause problems with the 'C' washer etc?

I would've thought that was enough - it will have knocked off the high spots and you'll never remove the low's.
On assembly I now put one drop of light machine oil on my finger and wipe the around the taper. It seems to let the flywheel go on better (no galling) and certainly makes removal easier - still need plenty of force in the puller but one tap on the end of the bolt and off it comes.

i agree with Graeme that the crank has been lapped enough.

You are only lapping it to remove the high spots. Once these are off that's enough. Where's it going for balancing Andy?

Thanks all.

Taking it all to EDA in Castleford Mark. The crank should have already been.

http://www.engine-data.co.uk/

Balance on crank should be spot on

For the record EDA charge £70 to balance the whole bottom end - crank, rods, pistons, flywheel, cover, backplate and damper.
Dropping mine off this weekend.

That is very cheap

That's not cheap in the deprived Northern 1/2 of the country. We can't all afford fancy midland prices

I've had 4-5 engines balanced by EDA over the years, the first was over 15 years ago and I'm sure it was £70 back then, which seemed expensive at the time.
Grim up north works for me

Grim up north works for me

Ditto