Clutch Brake Pedal Assembly

[Bob I.]

I removed the brake and clutch pedal assembly, while I have it out, is it worth changing the bushings on the shaft. I took one bushing out, I did't see any wear in that bushing.
Bob

[John H.]

Re: Clutch Brake Pedal Assembly

I removed the brake and clutch pedal assembly, while I have it out, is it worth changing the bushings on the shaft. I took one bushing out, I did't see any wear in that bushing.
Bob

Bob -

There are four bushings in there, that cost less than two bucks for the bunch; considering the effort it takes to get there and how annoying the squeaking can be when it starts, I'd replace them.

[Joe L.]

Re: Clutch Brake Pedal Assembly

Bob - There are four bushings in there, that cost less than two bucks for the bunch; considering the effort it takes to get there and how annoying the squeaking can be when it starts, I'd replace them.

John and Bob----- Definitely! The last GM part number I can find for the nylon bushings is GM #15594358. It's discontinued but it's possible there's a new number. In any event, these bushings are easily available from other sources. Also, be sure to check the harness pin on the clutch pedal shaft for wear caused by the clutch push rod. These are often worn. If there's even a little wear, you need to replace the pin because with even a little wear it means the case hardening is worn through and wear will increase dramatically from that point. You absolutely don't want a wear-weakened pin to fail with the car in gear, the clutch depressed and the engine running. The pin is tack-welded to the pedal shaft. To replace it you must grind off the weld and press the pin out. I recommend lightly spot facing the side of the shaft that the head of the pin seats on because perfect perpendicularity of the pin to the shaft is critical. Addendum: The bushings can be obtained under Dorman #74016

[Bob I.]

Re: Clutch Brake Pedal Assembly

Joe
The Harness pin shows wear, along with slight grooving. I'll replace the pin, also where can I source the pin. The clutch push rod hole shows no wear. How do you release the tension, for the return spring on the brake pedal.
Bob

[Joe L.]

Re: Clutch Brake Pedal Assembly

Joe
The Harness pin shows wear, along with slight grooving. I'll replace the pin, also where can I source the pin. The clutch push rod hole shows no wear. How do you release the tension, for the return spring on the brake pedal.
Bob

Bob-----


GM #121741 would do you for the pin but it's long-since discontinued. I'd try McMaster-Carr. You want to make sure the pin is case hardened.

The hole in the clutch push rod rarely wears. I believe it's hardened to a greater degree than the pin.

I've forgotten the procedure on the brake pedal spring.

[Steve L.]

Re: Clutch Brake Pedal Assembly

Do you have a picture of this pin. I just took out my pedal assy and I am not sure what pin your are discussing.

[Joe L.]

Re: Clutch Brake Pedal Assembly

Do you have a picture of this pin. I just took out my pedal assy and I am not sure what pin your are discussing.

Steve-----

I don't have a picture available. However, there is only 1 harness (clevis) pin on a 68-81 clutch pedal. It is a 5/16" OD and it is where the clutch pushrod attaches to the pedal.

[James B.]

Re: Clutch Brake Pedal Assembly

Are you referring to this?

http://www.amazon.com/Corvette-Clutch-Fork-Clevis-Made/dp/B001VJ55J0

[Steve L.]

Re: Clutch Brake Pedal Assembly

The word "harness" threw me. I now know what pin you mean. What I didn't realize was that this pin was spot welded to the pedal. I was wondering why I had a really hard time getting the pin off. But I did get it off while under the dash. I guess the procedure would be to remove the clutch push rod off the clevis first, then pull out the clutch assy including the clevis. Then remove the pin on a bench top. Where were you about 1 wk ago. Now I'm wondering why did the designers go thru all this effort. It looks like there is a tight fit between this pin, the clutch pedal and the clevis. Probably to keep the slop as low as possible. But if it was a regular fit with, say, 0.003 slop, would you really notice it?

[Bob I.]

Re: Clutch Brake Pedal Assembly

Steve
Did you replace the pin, if so where did you find a replacement pin.
Bob

[Bob I.]

Re: Clutch Brake Pedal Assembly

Steve
Did you replace the pin, if so where did you find a replacement pin.
Bob

[Steve L.]

Re: Clutch Brake Pedal Assembly

My pin looks to be in good shape. But I need to inspect it more closely now that I'm aware of this thread.

[Bob I.]

Re: Clutch Brake Pedal Assembly

My pin has wear on less than half the pin. I'm thinking of rotating the pin.

[Joe L.]

Re: Clutch Brake Pedal Assembly

My pin has wear on less than half the pin. I'm thinking of rotating the pin.

Bob------


The pin is tack welded to the pedal lever shaft. So, to rotate it you'd need to grind off the tack weld. By the time you do this, you might as well just replace the pin. Also, this pin ALWAYS seems to wear on just one side. However, this is only a 5/16" OD pin. So, any wear greatly reduces its shear strength.

One thing that can be done: often times the wear will occur on the pin about 1/8" outboard from the pedal lever shaft. This occurs because the clutch pedal push rod is usually somewhat "floating" on the pin and there is an inner washer which effectively shields that part of the pin from wear. So, you can position the pushrod so it engages mostly on the 1/8" of the pin closest to the pedal lever shaft. Use a very thin or no washer on the inboard side. Then, shim the pin with washers between the pushrod and the cotter pin so that virtually all clearance is taken up. This arrangement will force the pushrod to remain on the unworn section of the pin. Always grease the pin and washers.

[Joe L.]

Re: Clutch Brake Pedal Assembly

Are you referring to this?

http://www.amazon.com/Corvette-Clutch-Fork-Clevis-Made/dp/B001VJ55J0

James-----


That's the one.