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Marc Haibeck · 07-04-2013

A new dual mass flywheel from GM has approximately .010 inch dish. It’s lower in the center than on the OD. I don’t know why it is finished that way. A worn flywheel might have .025 inch of dish. Also, the top half is floating on a bearing. If it were to be machined, a tool is needed to hold the top not the bottom. Maybe GM thought that it could not be machined correctly and to keep it simple they recommended not trying it.

Years ago I noticed that Lingenfelter Performance was machining them flat and they worked perfectly. So I started doing it. We have done about four of them and there have been no issues. You can have Jim do it.

07-04-2013	#7
Marc Haibeck Join Date: May 2007 Location: Addison IL Posts: 253	Re: Resurfacing a flywheel (1994)? A new dual mass flywheel from GM has approximately .010 inch dish. It’s lower in the center than on the OD. I don’t know why it is finished that way. A worn flywheel might have .025 inch of dish. Also, the top half is floating on a bearing. If it were to be machined, a tool is needed to hold the top not the bottom. Maybe GM thought that it could not be machined correctly and to keep it simple they recommended not trying it. Years ago I noticed that Lingenfelter Performance was machining them flat and they worked perfectly. So I started doing it. We have done about four of them and there have been no issues. You can have Jim do it.