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Hi, nobody seems to have an idea on the street, so I’m reaching out to like minded people. Bought a 07 c230 sport about 18 months ago from a Benz dealer mechanic, looks and runs outstanding. Back story is precious owner ( the mechanic ) blew the original engine, and replaced with a 3.5 liter. Within a month a tapping noise was coming from the bell housing, started faint, grew louder over time. Previous owner diagnosed cracked flywheel. He was good about it and replaced the part for cost of the part. A little more than a year later, same exact problem. I want to save the car, but don’t want to waste money if this will be an ongoing issue. My most noteable advice at the moment is to install a steel billet proformance flywheel, and maybe a different converter. And scouring the net turned up neither. I’m a little lost, clearly the bigger engine is the biggest issue. Pic is the oem cracked wheel. Thank you everyone
 

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Was a new flex plate installed the last time it cracked?, if a used 1 was installed you dont know how much it was used, it may have already had a small un- noticeable crack ?
Or If it keeps cracking flex plates it means there is something out of alignment, and the constant flex is weakening the plate.
I dont think there is such a thing as a steel billet Auto flex plate for a Mercedes, plus I dont think that will solve your problem as that will crack too after time if there is a issue that is causing it.
I would call into a Automatic transmission specialist and ask some questions, they see this stuff a lot more than the average mechanic.

I had a similar problem on a Ford Auto, 3 flex plates later, it turned out to be the lugs on the torque converter were uneven, not saying your car has the same problem, but worth a check.
 
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