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Clutch linkage adjustment

 
uget2nd
I love my Chevy Chevette!
Posts: 10
Joined: 04/13
Posted: 07/01/13 02:05 PM

Thanks for your replies to my earlier posts. all information is greatly appreciated.
My last post I mentioned my clutch fork face was hitting the pressure plate.
To fix this I ground down the fork until it was clearing the bolts on the pressure plate by .050

My next problem is that my clutch fork movement is only about 1 1/4 inch and that is not enough to fully disengage the clutch.
The only adjustment is on the bottom of the Z bar. The rod that pushes the fork has about 3 inches of adjustment.
If I preload the throwout bearing, I have enough movement to fully disengage, but the clutch is always partially engaged.
How do I get more clutch fork movement. Am I thinking to hard on this  

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waynep712222
I have an SS396 tatoo
Posts: 251
Joined: 03/13
Posted: 07/01/13 11:30 PM

is there any slack in the system.. oval push rod holes??

worn clutch pedal pivot bushings up under the dash board?????

how tight does the bell crank fit on the pivot balls??  is it really worn..

can you provide us with a year make and model... so i can grab some factory clutch linkage drawings and post them..????

this is a complex question.. and i spent a LOT of time working on my 66 GTO with similar issues..

i actually had a chevy 2 lakewood scattershield that had the opening at 7 o clock instead of 9 o clock..  so that involved finding a 13/16-20 tap to make new threads in the pivot mounting ball bracket also..

lets see...

the last section of the bell crank lever... when relaxed.. is it in this angle../____.

so that when the pedal is moved thru its full range of motion.. it swings from

this /_____  to \_____ so the stroke transmitted to the throw out arm is full..

if it starts like this\    and ends like this---  you are just not going to have enough stroke pushing the clutch fork..

this is true for the clutch pedal to push rod under the dash

the push rod to bell crank

the bell crank to adjuster..

because you have moved the clutch fork backwards.. you may have to extend the adjuster to make up the difference...

since i don't know what exact parts you are working with.. its really hard to guess... i hope this theory is helping...

there are several articles on valve train push rod geometry.. and centering the tip of the rocker over the proper area of the valve tip.. you need to read some of those articles.. except instead of a single rocker arm... you are going thru 3 rocker arms..   pedal to push rod.. push rod to Z bar., z bar to adjuster ,, adjuster to clutch fork...     clutch fork to fork pivot ball..

its NOT easy to calculate push rod angle vs movement thru 3, 4 of 5 angle changes...

did the z bar need to be modified to clear the headers??/

changes in center to push rod center length effect ratio of angle to push..

dorman 14554
14554 007


~~~~~~~~~~~
dorman 14555
14555 007  

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waynep712222
I have an SS396 tatoo
Posts: 251
Joined: 03/13
Posted: 07/01/13 11:35 PM

here is attic i have used several times.. i have used the dorman 14554 several times.. i almost always weld one of the jam nuts to the push rod tube.. so it is locked...  i have thought about hell coiling the inside of the tube..

but if you need additional length.. since this is a 3/8-24 thread.. pick up a 3/8-24 coupling nut..

have somebody weld it to the tube.. this will give you an additional inch or inch and half of length..   since the 14554 is under 10 bucks at most stores.. buy a pair..  

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waynep712222
I have an SS396 tatoo
Posts: 251
Joined: 03/13
Posted: 07/01/13 11:40 PM

see part number 4 in this image.. are they worn...

Images?Q=Tbn:And9gcqaujrdtpuwuc Irl1gu3 Jqkzeo03ibt7qwlswatyfy3td2gr


C990016 Lrg  

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waynep712222
I have an SS396 tatoo
Posts: 251
Joined: 03/13
Posted: 07/01/13 11:45 PM

see how the lower lever on the Z bar is angled away from the clutch fork..

/------------}

Exhaust System Clutch Linkage Rod IMG 5060 1024X768  

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waynep712222
I have an SS396 tatoo
Posts: 251
Joined: 03/13
Posted: 07/01/13 11:50 PM

don't pay attention to the fractional measurements on this image..

look at the Z bar angles..

0900C1528005197d

0900C1528005197e  

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uget2nd
I love my Chevy Chevette!
Posts: 10
Joined: 04/13
Posted: 07/06/13 05:34 PM

Thank you very much for helping me out.

I appreciate all input.

Thanks
              Paul  

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