I don&#039;t know if this will help, but I have run into similar problems on other equipment. Never had a 1550 clutch apart, but does the flywheel have a step in it? If so, then perhaps the wear surface is worn down. If so, the flywheel will need to be ground and brought back into factory specs, both surfaces, the one where the disc runs, and an equal amount will need to come off where the pressure plate bolts. Most shops charge about $20 to grind these. I never replace a pressure plate unless I have the flywheel ground. Another really stupid question, are all your bolts good and tight?