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671 Detroit Clutch problemPosted by John T on September 28, 2009 at 13:35:28 from (66.244.97.31): My 81 year old buddy has a 60’s model 671 Detroit Diesel (Bus RV conversion) with a 4104 4 speed tranny and he can NOT get the new clutch to release properly so the gears can be shifted even when setting still and clutched to put it in gear, the tranny is still turning and the gears have to grind grind grind…….. He installed a new clutch disk,,,,,,,,pressure plate,,,,,,,,,throw out bearing,,,,,,,,,had the flywheel machined smooth. We have adjusted the 6 adjustable fingers (that mate to throw out bearing when clutch is depressed) every which way but loose and adjusted the clutch pedal linkage every way possible in and out tight and loose all to no avail. Currently the fingers are adjusted like ¼ inch away from throw out bearing (i.e. it ONLY turns when clutch is depressed) and when he depresses the clutch pedal to floor the throw out comes forward and pushes the fingers about ¼ inch or more and the springs compress and in theory the clutch disk should be free and NOT turn the tranny so he can shift but Nooooooooooooooooo the gears still grind grind grind SOOOOOOOOOOO we keep adjusting/tightening the clutch rod to pedal linkage to get more forward throw out travel to push fingers deeper and she grinds less butttttttttttttttt then when the pedal is released the fingers are too close to the throw out and it spins constantly (only should when clutch is depressed)……… If we adjusted the fingers farther away from throw out (to stop its turning when pedal released) that wouldn’t help cuz then we just have to adjust/make the linkage move further to push the fingers deeper so the springs compress to release the clutch, i.e. it don’t accomplish anything it seems grrrrrrrrrrrrrrr Like I said we have adjusted the 6 fingers per the book and NOT per the book and adjusted the pedal rod slack tight n loose everywhere AND SHE WILL NOT RELEASE so the gears can be shifted REGARDLESS WHERE WE SET EITHER ADJUSTMENT Its drivin me to drink as I don’t have enough hair to pull out. Anyone experienced with Detroit 671 clutches that can shed light on why it don’t release so the gears stop turning and grinddddddddddddddd Ol John T NOT a clutch kinda guy
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