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Username Post: clutch adjustment        (Topic#360890)
bobb 
Super Senior Member
Posts: 5635

Loc: paradise
Reg: 09-05-03
05-09-20 07:42 PM - Post#2793348    

my clutch had too much freeplay so i adjusted it. didnt last long maybe 15 miles and needed to be adjusted again. somethings not right here i havent had to adjust it for at least a year. nothing looks cracked, loose or worn and it wont hold the adjustment. i may use this opportunity to revamp the z bar that has poor geometry to begin with. although i do want to get to the source of the problem. this one has me stumped

70 L camino, grampa engine, g-force 5 spd, road rage suspension. Pray first before all else fails.


 




aghaga 
"4th Year" Silver Supporting Member
Posts: 2266
aghaga
Age: 65
Loc: Altavista, Va.
Reg: 07-05-08
05-10-20 06:28 AM - Post#2793379    
    In response to bobb

My guess is a cracked weld on one of the z-bar
levers



 
steve65 
"5th Year" Gold Supporting Member
Posts: 862
steve65
Age: 62
Loc: New Westminster BC
Reg: 09-25-13
05-10-20 09:17 AM - Post#2793391    
    In response to aghaga

Yes, it might only show itself while under stress?
Steve

Steve Duncan
66 Impala 2dr Coupe
Not sure of color yet
work in progress



 
bobb 
Super Senior Member
Posts: 5635

Loc: paradise
Reg: 09-05-03
05-10-20 11:40 PM - Post#2793469    
    In response to aghaga

bingo, the crak was behind the upright lever so i couldnt see it. odd thing though. i adjusted it again this morning, pressed the clutch about ten times and it seemed off but useable. drove out and a mile later it finaly failed. driving home with no clutch was interesting. lol. i was starting to believe it was a bad disc, then i looked again and there it was the zbar tube ripped. yanked it beefed it up and were back on the road again.

70 L camino, grampa engine, g-force 5 spd, road rage suspension. Pray first before all else fails.


 
aghaga 
"4th Year" Silver Supporting Member
Posts: 2266
aghaga
Age: 65
Loc: Altavista, Va.
Reg: 07-05-08
05-11-20 03:56 PM - Post#2793546    
    In response to bobb

good news



 
IgnitionMan 
Valued Contributor
Posts: 3769

Reg: 04-15-05
05-11-20 06:09 PM - Post#2793554    
    In response to bobb

As a matter of both course, and having this problem before, I always weld in strengthening triangles at the junction points of the levers and center tube.

It ain't easy driving a stick with no clutch control, no fun, either.



 
bobb 
Super Senior Member
Posts: 5635

Loc: paradise
Reg: 09-05-03
05-11-20 09:34 PM - Post#2793569    
    In response to IgnitionMan

could be my imagination, but the pedal feels more rigid. maybe it was cracked for some time and flexing so i couldnt tell the difference.

70 L camino, grampa engine, g-force 5 spd, road rage suspension. Pray first before all else fails.


 
japete92 
"6th Year" Silver Supporting Member
Posts: 1404
japete92
Loc: No. Virginia
Reg: 01-18-13
05-12-20 07:57 AM - Post#2793591    
    In response to bobb

  • bobb Said:
bingo, the crak was behind the upright lever so i couldnt see it. odd thing though. i adjusted it again this morning, pressed the clutch about ten times and it seemed off but useable. drove out and a mile later it finaly failed. driving home with no clutch was interesting. lol. i was starting to believe it was a bad disc, then i looked again and there it was the zbar tube ripped. yanked it beefed it up and were back on the road again.



I've attached a pic of one of my z bar failures (I've had two virtually identical) on my '63. They were 'aftermarket' repro's.

Note the weld did NOT fail. It is a classic crack propagation failure. Where did the crack(s) come from? Likely from the WAY too much weld (heat) applied to the 'pipe' section.

I do not know how yours failed nor do I know how you 'beefed' it up. If you failure was like mine, AND you welded 'MORE' on it, I would not be surprised if you have a recurrence of the failure some time in the future.

A couple of properly sized, and well placed spot welds, would be sufficient on 'virgin' steel (not previously cracked) sections.

Or, find a NOS (or used GM) part. Those are not OVER welded.

Just a thought.

Pete





Attachment: failed_cross_brace.jpg (1.2 MB) 5 View(s)






 
bobb 
Super Senior Member
Posts: 5635

Loc: paradise
Reg: 09-05-03
05-13-20 08:43 AM - Post#2793686    
    In response to japete92

mine is not oem . the crack is about the same as yours. it is welded on the thinnest part of the tube where the snap ring is. it is also at the end of the tube. it is also not between the load points but on the machined thinner section at the end of the tube. many wrongs. i bent mine back into shape on a mandrel to keep the inside nice and round, then welded the crack. then i scabbed a piece of pipe on the load side of the tube. then added a brace. i also scabbed a piece of pipe on for the other arm. it aint pretty but i put enough thought into it so im sure it wont break again.

70 L camino, grampa engine, g-force 5 spd, road rage suspension. Pray first before all else fails.


 




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