Turning a flywheel

Mark W. · Jan 26, 2009

What negates that this needs to be done. I am restoring a super a
and am considering having this done but, how do I know if it is
needed?

mkirsch · Jan 26, 2009

Hmm, I dunno. When I did the clutch on my H I figured the flywheel did plenty of turning while it was on the engine so it didn't need to be turned anywhere else

Sorry, I just had to say it.

The purpose of turning a flywheel, as I understand it, is to provide a clean flat surface for the clutch to grip to. Turning removes surface imperfections and glazing that builds up between clutches.

I don't think you can tell if a flywheel absolutely needs to be turned without a dial gauge to measure surface runout. There are some people who will tell you to turn the flywheel with every clutch replacement to maximize the life of the clutch disk.

Anonymous-0 · Jan 26, 2009

Find a shop that will surface grind them. It is a special machine and will grind just enough to remove the glaze. You only need to remove a couple thous. Dont remove any more than that or yoa can run into problems with the pressure plate.

Janicholson · Jan 26, 2009

I'll ad to the discussion:
Surface cracking/checking (tiny cracks running across each other), blue or differing color spots that feel raised, scoring if deep enough to feel with a fingernail, ar all reasons to grind (as pointed out below).
To keep the clutch dynamics and effectivess in spec. the specification depth from clutch friction surface to the Pressure plate mounting surface must be correct. Thus grinding .008 off of the friction surface then needs to have .008 taken off of the clutch PP flange (or the amount needed to bring it into spec. JimN

Paul in MN · Jan 26, 2009

If there are any wear grooves in the face of the flywheel, it should be turned. While you are at it, inspect the ring gear carefully. It should have a bit of taper to the teeth on the side that the starter bendix gear engages. But if you have any half broken teeth or badly chipped teeth, then replace it now. I bought a new one from FNH for a IH300U for about $35 a couple of years ago. You can probably get the shop that does the flywheel surfacing to install the ring gear for a reasonable price.

After years of not being totally satisfied with flywheel and press plate service, I found the "Clutch Doctor" just north of Forest Lake MN. He is also into old tractors and does excellent work for very reasonable $$. He also does mail order business. He has the knowledge, the right equipment, and the jigs for setting up clutch and press plate together. He does the work himself and stands by what he has done. If you need contact info for him, e-mail me and I'll find his business card.

Paul in MN

Turning a flywheel

Mark W.

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mkirsch

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Anonymous-0

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Janicholson

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Paul in MN

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