Flywheel question - Mercedes-Benz Forum

 
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post #1 of 4 (permalink) Old 08-01-2009, 08:45 AM Thread Starter
GGR
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Flywheel question

Hi all,

The other day I took a M116 3.5 flywheel for the contact surface with the clutch disk to be ground as it was not even. I then took it to another workshop to have the contact surface with the pressure plate recessed in order for the distance between these two surfaces to be within specs ie 3.8 mm. The problem is that the second workshop did not make it to put the flywheel exactly into the same plan as the first workshop and therefore there is a difference of 0.001 inch between the two plans. In other words, the contact surface with the clutch disk is not exactly parallel to the contact surface with the pressure plate, and the difference is 0.001 inch (or 0.025 mm) over the clutch disk diameter. The first workshop told me this was negligible and that the action of the clutch disk will grind the difference.

I already had some problems with a new clutch vibrating in the past (the flywheel had not been resurfaced) and had to re-dismantle everything. I would not like the same thing to happen this time. Should I have the contact surface with the clutch disk corrected, knowing that the flywheel is already (nearly) out of tolerances and that I may have to have it rebalanced (time and money), or should I just fit it like this?

Thanks!
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post #2 of 4 (permalink) Old 08-02-2009, 11:31 AM
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That is not enough to be a problem. It will wear in, and each part is already balanced.
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post #3 of 4 (permalink) Old 08-04-2009, 11:17 AM
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I concur - less than a quarter of a millimeter isn't much ...
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post #4 of 4 (permalink) Old 08-04-2009, 11:31 AM Thread Starter
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Thanks to you both. It'll save some work imeand money.
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