The dual mass flywheel means it has two moving parts, cushioned by an inner component. Primarily, the dual mass flywheel was engineered to eliminate excessive transmission noise. Unfortunately, the flywheel may wear out after a period of time. This is commonly noticed by a loud clunking/knocking noise which may go away when the clutch is depressed. Additionally, an engine misfire will also cause the flywheel to make a similar knocking noise.

When flywheel replacement is necessary, be sure to order some flywheel weights also. By looking at the 28 small holes located near the edge of the original flywheel, you may find these small weights filling several of the holes. This is the original weighting done on your engine during it's initial assembly. BE SURE to place the new weights on the new flywheel in the identical positions. You remember the balancing of a nickel on the LT5 plenum they once did during the ZR1's introduction? Well, that smoothness may vanish if the flywheel is not kept in similar balance.

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