Flywheel resurface measurement
 

I'm installing a new clutch on my FD and would like to send out my flywheel to get re-surfaced what is the measurement on the step. so I don't loose clamping force, pressure and feel.

the fsm only mentions runout at 0.2mm. it doesn't seem to consider a resurface spec (page h23). they only take off a really small amount when they resurface. the friction surface is raised a little bit from the rest of the flywheel. any competent machine shop will know if it has enough or not or if its warped

I've done probably 100+ clutch jobs on FD's and FC's. I have NEVER resurfaced a flywheel.

If you see major damage, replace it. If not, scuff with sandpaper, clean, and go.

I've seen way more cases of flywheels permanently screwed up by having them machined than doing any good.

Yes, it will look "burnt" - ALL flywheels look like that, even after a few hundred miles of driving easy. The clutch doesn't care what it looks like.

Dale

I resurface every used flywheel when a new clutch disk is being installed, it greatly increases clutch life. Since the OEM flywheel is $600 new (if you can find one), it makes sense to spend $100 or less making it new again.

Step is 0.43mm
https://cimg7.ibsrv.net/gimg/www.rx7...0138a6ffee.jpg

AWESOME!! thanks everyone.

is this a brand new flywheel measurement or after it was re-surfaced?

brand new

I will say it's only worth doing if you have locally a GOOD machinist that can do the job RIGHT. I've seen a number of cases where a machine shop screws it up.

In my experience it's not worth doing unless there is significant damage.

I will defer to Banzai Racing's experience of helping clutch life but I'd rather not go through having one machined too thin, having them lose all the dowel pins, or them trying to remove and re-install the ring gear and have it fall off (seen that one!).

IMHO there's more negatives than positives UNLESS you have a shop that is competent.

Dale

Normally get the flywheel and pressure plate done with clutch plate change to avoid hard spot shudder, last one was under 5 thou for each friction surface.

Hard to imagine the need to remove the ring gear on a typical rotary grinding machine, far bigger flywheels out there....unless that was something attempted on a lathe.

The issue with not resurfacing the flywheel is the step wear. The pressure plate mounting area needs to be machined down to maintain the proper amount of clamping force. The clutch disk never covers the entire mating surface area so the original step dimension is there on the flywheel.
https://cimg4.ibsrv.net/gimg/www.rx7...bc7dbea00a.jpg