Balancing a 6.9 rotating assembly

[Thewespaul]

The manufacturer balances them separately. And pressure plates get replaced quite often if you have employees driving a truck. When you’re taking the time balance and engine for a rebuild, you’re hoping to go through several clutches before then engine ever needs to come apart again.

 

[Knuckledragger]

The friction disc is very low mass where it counts, so nothing is needed there. The pressure plate is balanced carefully at the mfr because it is a replaceable part. If you bolted on a new clutch and the driveline started shaking like crazy, where its the first place you would look?

I have heard of plates being drilled off center, but that is the exception, not rule. Maybe some Chinese factory got a broken drilling jig.

No, do not bother with the disc or pressure plate. They are already fine.

 

[MTKirk]

I paid $350 to get mine balanced, this was almost two years ago. the difference before and after is noticeable, there's less vibration at idle and at speed.