Posted by John T on October 02, 2009 at 16:02:06 from (66.244.97.31):
My buddy has a sixties 4104 Greyhound Bus RV with a 671 Detroit and Spicer 4 speed tranny with a single disk non braking push type clutch. He has had problem for years that gears had to grind bad to put in tranny gear so he just replaced:
Clutch disc and pressure plate with 6 adjustable fingers,,, New Throw out and Pilot Bearings, both fit and work correct,,,,,,,Disk is on right direction and hub fits n slides sweet and smooth on input shaft,,,,,,,,Flywheel turned/machined down smooth,,,,,,,,,,The two side bushings in bell housing (where big bell housing arm pivots when pedal is depressed) are new and tight,,,,,,,Currently the fingers are adjusted so there’s like 1/8 inch between throw out bearing when at rest to the fingers (so throw out don’t turn all the time DUH) ,,,,,,,clutch linkage adjustment set tight so as soon as pedal starts down the throw out tightens up against the fingers,,,,,
BUT WHEN PEDAL IS ALL WAY TO THE FLOOR HE ONLY GETS LIKE ½ INCH OF THROW OUT TRAVEL (1/2 inch of throw out depressing fingers to disengage clutch) Id like to see it move maybe ¾ to 1 inch for more spring depression???
If started in gear with pedal depressed the bus dont move, it releases enough for that, but still grinds bad if put in Neutral then try to get in gear
QUESTIONS: 1) Is ½ inch enough travel so fingers move far enough to disengage clutch? 2)How critical is the 6 fingers adjustment??? We screwed them way out so theres only 1/8 inch between them and throw out at rest trying to maximize travel when pedal is depressed to push fingers deeper. They were way back from rebuild shop, but as set there was like ¾ inch before throw out ever contacted them, so we adjusted them more outwards so they will be closer to throw out when its all the way back.
Our plan is to fix any slop or wear in clutch pedal and linkage especially rear where the cross direction pivot is TO TRY AND GET MORE THOW OUT AGAINST FINGERS TRAVEL WHEN CLUTCH PEDAL IS TO FLOOR
PS Today we checked and tightened and adjusted and took up about any and all slack we found in the linkage from pedal all way back to bell housing (after today I no longer think linkage or its wear is the problem) when the pedal starts to move the big bell housing lever arm moves buttttttttt I still don’t believe the throw out travels far enough back to front i.e dont push fingers deep/far enough
PS FINGER ADJUSTMENT: We have them adjusted outwards a bunch so they are closer to the throw out when its all the way back in full retracted rest position. If they are moved farther towards pressure plate all that does is we have to take out more rod linkage slack to bring the throw out up closer to the fingers again. HOWEVER they are alllllllll adjusted equal distance from throw out…….
WHY ISNT IT RELEASING ???? GEARS STILL GRIND BAD,,, PLEASE HELP BEFORE IT DRIVES ME TO DRINK AS I HAVENT ENOUGH HAIR TO PULL OUT LOL
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