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MG Midget and Sprite Technical - advice scored flywheel

I bought a new clutch and all the ancillaries. The flywheel is scored, can i do it myself with a sander or do do I have to bring it to somebody with a lathe who can also balance it?

Flip

Flip Brühl

It's scored?
Dave O'Neill 2

Flip,

I have done them myself with an air powered flexible disc grinder, but I don't recommend it. I was doing it on old beater cars that had a total value of little more than the cost of the machining. If you get it uneven, and cause a problem, it is a lot of work to get it out to do over again. I don't think there is a lot of money to be saved.

Charley
C R Huff

As Dave means Flip, it doesn't look to bad to me either. Scored to me means rivet marks. I'm pretty sure mine looked like that after the oil was removed. New clutch and fitting kit and 12000 miles later still good.
Dave Squire

Looks fine and usable to me also. I'm mainly wondering what the extra holes are for at the clutch cover spigot radius, maybe it has been drilled before for a non standard clutch cover?
David Billington

A grinder looks to aggressive to me. A sander is much slower but I am retired... And yes it has been drilled for a non standard clutch cover!
Flip Brühl

Resurfacing a flywheel is cheap.. less the $50 it will be a great surface thats also FLAT and true

yes you can resurface your own cly heads and polish your own crankshaft journals ...but why

prop
Prop and the Blackhole Midget

I would give it a good degrease and rub over with emery paper / wet and dry.

It does not look from the pics to have any grooves/scores that normally would need a skim.
richard boobier

That doesn't really look to bad imho. I would still send it to the machinist and have it cleaned up since up since you've got it this far apart. It never hurts to go the distance for a proper repair if your keeping he car for a long time.
S

Steven... thanks for the BJ

your friend

prop

haha .... something about kindred great twin minds is so special

.
Prop and the Blackhole Midget

I would be wary of machining if it has already been lightened at the back. Maybe it would stand the lightest of a cut, but don't go below the Special Tuning dimension or you risk it breaking up in use and a disintegrating flywheel spinning at 6000 rpm is not a good thing to have next to your legs in the car.

I would clean it with spirit, and go over the surface by hand with a bit of emery cloth to get the staining and marks out. You could then face it with coarse grinding paste on a sheet of glass to give it a fresh surface but it's probably not worth the time it would take.
Guy Weller

My turn
If you machine that in a lathe there will be little bumps left remaining where the blue hotspots are there
To do it properly it needs to be ground with a toolpost grinder if someone near you has the gear to do it--
If you want to do it youself get some course wet and dry sandpaper - like 80grit and a sanding block
Use soapy water and get stuck into it concentrating mostly on them burnt spots first until they are flat and then the rest of it
Don't use kero or anything oil based as it will get into the metal and come back out onto your new clutch as soon as it gets hot

willy
William Revit

I have done it with 80 grit. it took about 10 min. To my astonishment the blue spots were friction material on the flywheel and no holes ore scratches. I think the clutch has been to hot, I could smell that.
Flip Brühl

Great Flip :-)
Dave Squire

This thread was discussed between 13/11/2016 and 14/11/2016

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