Re: Detroit 671 Clutch Update

Posted by trucker40 on October 02, 2009 at 19:06:49 from (70.240.147.198):

In Reply to: Detroit 671 Clutch Update posted by John T on October 02, 2009 at 16:02:06:

One thing is to adjust those bolts on the arms of the pressure plate back to where they were originally from the rebuild shop.Thats not an adjustment you are supposed to mess with,its to adjust the arms so they release the pressure plate evenly.Once you get that done,look for whats wrong from there.One thing that happens a lot is the piece the throwout bearing rides on,or nose piece on the trans that the input shaft goes through wears out or breaks a lot of times.Then its hard or next to impossible to get one like you had.Then after you get one,the throwout bearing piece wont fit it,so that gets changed.It sounds like since you say with the bolts screwed in like they should be the throwout bearing piece is almost off of the nose piece when adjusted up like it should be.Something is probably wrong there.You need an old greyhound mechanic maybe to look at it if possible and see if he agrees.Maybe even see if a parts manual for that bus exists and what the part numbers for those parts are and their measurements.Then measure yours and see if you can figure it out.You might have to make a new nose piece and throwout bearing piece on a lathe to fix it right.There are different length fingers that push the throwout bearing.Somebody could have put the wrong one in because they couldnt find the right one and thought it would work.
Even if you have all of the slack out of the linkage does not mean some parts arent worn to where they arent pushing or pulling enough to move the throwout bearing far enough.You might have to shorten the linkage from just taking out the slack to pushing on the throwout bearing to see if you even can make it work.If you cant make it work then some parts are probably wrong,or bent,or just wont work any more.
Some things are poorly made from the first day.Lots of stuff is slapped together by people who dont care,and especially stuff that companies sell because they dont need it,is slapped together to get it to work long enough to get rid of it.Sometimes they use only what they have on hand and wont spend money on the right parts.Sometimes for old stuff its next to impossible to find the right parts since everything is on a computer now.Some people cant find it if the computer doesnt know they have it.You need to lock up the liquor and duct tape your head real good so you dont pull the few hairs you have and start looking a lot harder for whats wrong with this fine piece of equipment you have.With all the slack out and still grinding gears,thats my best guess,wrong parts to start with.That could be wrong,but its worth looking at.After that I guess it would be alright to hit the nearest bar.

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