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300SD
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11,191 Posts
Discussion Starter #1
Anybody inspected their torque converter flex plate for loose bolts and potential failure? Both gassers and diesels have this plate, but supposedly it fails only on diesels due to increased vibration.

Anybody replaced this plate? It looks like it requires the transmission removal from the car.
 

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1981 300CD, 1973 280C
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448 Posts
Yes trans must be removed to access bolts at rear of crankshaft. Generally you can see problems on a Mercedes because of the inspection window provided on the bell housing. If the flex plate is cracked at a bolt hole you will generally see a rust stain coming down from the bolt head. If the rust streaks come from above the outer retaining bolts then the small circle of bolts holding it to the crankshaft are loose or the plate is cracked. Usually there is a knocking noise when bolts are loose or a cracking noise out of gear and the noise quits or lessens in gear. The diesel is no more prone to failed flex plates than any other car. Any flex plate can fail when its loose or the starter is loose. Most flex plates are replaced because of faulty starters damaging the gear teeth or a driver engaging the starter when the car is already running! Something thats almost impossible to do on a Merecedes because of how the ignition switch is designed.
 
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