I'm putting the flywheel from my a12 on to my new a15. Not planning on having it lightened - just standard a12. New clutch at the same time.

Do I need to have the flywheel machined or resurfaced while I'm at it?

It's good practice to machine the flywheel when fitting a new clutch.
Clutch manufacturers do not offer warranty unless it has been done. And its cheap, so why not.

Given thats its quite a bit of work to take the flywheel back out if you find you have a shudder it makes sense to do it now while its easy and accessible

That said I have only had it done with clutch upgrades

Last one I put in has to come out because I didnt do so and now has a shudder

Ok makes sense.
So I just turn up to a brake and clutch shop, with flywheel in hand and say "please resurface this"?

Yes, they will take your money with those instructions.

Yes, you should turn the flywheel if it is not in good shape!!! Better to not re-grind the flywheel if it doesn't need it.

It is not indicated to resurface the flywheel UNLESS cracks appear, or it is not flat (worn unevenly), or the surface is burnt (heavy glazing). Guys will tell you "it is cheap insurance" to machine the flywheel regardless, but that's not what the Datsun factory service manual says.

If it is warped, have it resurfaced. It is it burnt, chattered, or is grooved, resurfacing is called for. But it if still worked great, is flat, and not burnt, don't bother. The Nissan factory service manual does not recommend a resurface unless needed.

* Every time my Datsun flywheel did not look great, I should have resurfaced it, because then it chattered afterwards.

* Everytime it looked great and I didn't resurface it, all was fine.

a machining/engineering shop might be cheaper than brake and clutch place.

Is it ok to remove the flywheel with the engine still in the car?

Might save me a bit of time with engine swapping.

Yes, it is perfectly acceptable to remove the flywheel when the engine is in the car. The transmission needs to be removed however.

They key is to find a way to keep the cranshaft from turning. Use a flywheel stop.




Or this kind, but the bolt will end up bent (use a spare bolt):