72 clutch fork woes - Chevelle Tech
Troubleshooting Diagnosing problems done here.

 
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post #1 of 7 (permalink) Old Jul 13th, 19, 5:37 PM Thread Starter
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Join Date: Aug 2016
Location: Vancouver, BC, Canada
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72 clutch fork woes

Having some issues with my clutch fork on my 72 that I converted from auto last year. The clutch fork seems to "pop" on the pivot ball when the clutch is pressed in. Sometimes, when I release the clutch I get a loud clanging noise from the trans. Doesn't always do it.

Everything for the conversion is from OPGI. I've had lots of problems with the z-bar and also had to modify the frame bracket quite a bit as it was nowhere squared off to the engine on install. I am just waiting on an OEM z-bar that I got off ebay to replace the repop one which seemed to be made on a Friday.

Anyways, if anyone has any insight on why the clutch fork is doing this I would greatly appreciate it. Is it a bunk fork/ball?
I normally run the rubber boot and I have the aftermarket heim joint linkage. The TOB is installed correctly on the fork. There is enough air-gap. The clutch definitely doesn't feel right on the pedal side and I can always anticipate when it is going to make this clanging. Last thing I want is something to chip/catch a corner in there and explode my clutch.

Heres a short video:
https://youtu.be/l-2RpF3g_Ws


Thank you!

72 Chevelle Malibu
Muncie M20
SBC 406
KB Pistons
PW Aluminum heads
RPM Air Gap Intake
MSD 6AL2
Holley Sniper EFI
Holley Dualsync
Stainless Long Tubes to 2.5 Exhaust
UMI Suspension Stage 2
CPP Steering setup
10 bolt rear - 3.55 with Eaton Posi
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post #2 of 7 (permalink) Old Jul 13th, 19, 6:21 PM
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Eric
 
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Re: 72 clutch fork woes

Is the throwout bearing clipped to the fork?

Your just jealous because you can't hear the voices!

1967 Olds Cutlass 468 BBC/T400
1963 Plymouth Fury 440/Torqueflite
2007 Ford Mustang GT (momma's car)
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post #3 of 7 (permalink) Old Jul 13th, 19, 6:26 PM Thread Starter
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Re: 72 clutch fork woes

Quote:
Originally Posted by oldcutlass View Post
Is the throwout bearing clipped to the fork?
Yes, the TOB is installed correctly.

72 Chevelle Malibu
Muncie M20
SBC 406
KB Pistons
PW Aluminum heads
RPM Air Gap Intake
MSD 6AL2
Holley Sniper EFI
Holley Dualsync
Stainless Long Tubes to 2.5 Exhaust
UMI Suspension Stage 2
CPP Steering setup
10 bolt rear - 3.55 with Eaton Posi
eightballworld is offline  
 
post #4 of 7 (permalink) Old Jul 13th, 19, 6:32 PM
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Eric
 
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Location: Poteau, Ok
Posts: 4,116
Re: 72 clutch fork woes

And... the ID of the tob is correct for the front of the transmission where it slides back and forth, in other words the tob is not cocking sideways? And the fork stays on the ball.

Your just jealous because you can't hear the voices!

1967 Olds Cutlass 468 BBC/T400
1963 Plymouth Fury 440/Torqueflite
2007 Ford Mustang GT (momma's car)
oldcutlass is offline  
post #5 of 7 (permalink) Old Jul 13th, 19, 6:40 PM Thread Starter
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Re: 72 clutch fork woes

Quote:
Originally Posted by oldcutlass View Post
And... the ID of the tob is correct for the front of the transmission where it slides back and forth, in other words the tob is not cocking sideways? And the fork stays on the ball.
It is a centerforce 1.25" TOB, doesnt seem to be loose on the shaft from what I can see looking in the fork cutout on the bell.

The clutch fork does seem to be rocking on the ball. The clip on the pivot point of the fork stays on the ball.

If you push the fork upwards towards the top of the bell from the pushrod side, it will kind of click into place there. Same thing if you pull it down towards the ground, it will click into place there. When the fork is centered in the cutout on the bell it seems to be pretty sloppy on the ball.

72 Chevelle Malibu
Muncie M20
SBC 406
KB Pistons
PW Aluminum heads
RPM Air Gap Intake
MSD 6AL2
Holley Sniper EFI
Holley Dualsync
Stainless Long Tubes to 2.5 Exhaust
UMI Suspension Stage 2
CPP Steering setup
10 bolt rear - 3.55 with Eaton Posi
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post #6 of 7 (permalink) Old Jul 15th, 19, 12:15 PM Thread Starter
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Location: Vancouver, BC, Canada
Posts: 60
Re: 72 clutch fork woes

Anyone have any insight?

Considering just scrapping the mechanical if I cant get it working well and go with a hydraulic clutch set up.

72 Chevelle Malibu
Muncie M20
SBC 406
KB Pistons
PW Aluminum heads
RPM Air Gap Intake
MSD 6AL2
Holley Sniper EFI
Holley Dualsync
Stainless Long Tubes to 2.5 Exhaust
UMI Suspension Stage 2
CPP Steering setup
10 bolt rear - 3.55 with Eaton Posi
eightballworld is offline  
post #7 of 7 (permalink) Old Jul 15th, 19, 9:53 PM
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Al
 
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Re: 72 clutch fork woes

Only one way to find out. Pull the trans.

Throw out bearing may be bad, fingers on the fork worn or bent, wrong throw out bearing, broken flange on t.o brg. Worn pivot ball or clutch pocket bent/uneven fingers on the diaphragm. Worn out front bearing retainer.

The pivot ball you installed should have a flat head on the ball.

After the trans is out, insert an old input shaft or clutch alignment tool. Align the throw out bearing centered on the diagram fingers. Have someone slowly press in the clutch to take up the slack. Remove your fingers, your gonna need them. Then have them press in the clutch slowly.

Sounds like you know what you are doing, but I'll leave this video for review.


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