Adrian97 said:

What tools i can use to measure Flywheel step height? there is nobody in my area who can measure Flywheel step with dial indicator even machinist in my area does not know what is step height...
what do you think about this method ?

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Kryndon said:

Both the 1G and 2G N/A European DSMs have the flat style flywheel. The friction surface and the pressure plate mounting surfaces are parallel and at the same height/level. Step height is essentially the height difference between these two surfaces. On turbo flywheels, it's more important to get the correct step height (also based on aftermarket clutch specs).

On the N/A, because it is flat, your machinist needs to take off enough material so that both surfaces are completely flush with each other. This is much easier on the flat flywheels since you have a lot of material to work with. Just a slight pass on the surface would be enough to have them flush and shiny/clean. Personally I've taken my turbo flywheel to get machined and stepped properly, only to have the machinist take off too much material on the steps, so my step height is under the minimum limit, but it still works.

If you can't find a machinist that specifically does flywheels, look for a shop that rebuilds and machines cylinder heads. I'm sure they can set up their machine to run a flat mill/stone over the flywheel to get true flatness.

Also, since you've got a turbo GSX flywheel to be resurfaced, and since it's aftermarket (ACT), look on their website for the step height limits. It may be different than what the factory service manual calls for.

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