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02-14-2021, 04:21 PM | #1 |
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Clutch pedal question
I noticed that on my new (to me) 30 Town Sedan that there was excessive clutch pedal play - around 4", and the clutch grabbed almost at the floor - too low. So I went underneath the car to adjust it, and got poking around and in the end decided to remove and clean the adjusting link and the cross-pin that goes in the clutch pedal. The pin was a little more difficult to get out than I thought it should be, and lo and behold, once it was out I figured out why. It had worn so that there were wear shoulders where there shouldn't a oughta be. See pic.
That got me thinking about the condition of the clutch pedal, specifically the arms that the cross-pin fits. Well, the hole is quite elongated so it's gonna have to be repaired. My thoughts on repair strategy, and I'd appreciate feedback, are:
In the interim (until I do a major tear-down) I'm thinking I just put everything back together in the configuration it was when I took it apart, at least things have "worn in" to a usable configuration. Alternatively I could turn the cross-pin upside down, but I'm afraid that might make the load on the two ears of the clutch pedal asymmetric and break something. Thoughts? Thanks. JayJay
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JayJay San Francisco Bay Area ------------------------ 1930 Murray Town Sedan 1931 Briggs S/W Town Sedan |
02-14-2021, 04:50 PM | #2 |
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Re: Clutch pedal question
For know I would just put everything back and if you can adjust it for about 1" of play.
While you have the pedals out, if they are not installed I would install a zerk in the bottom clutch and brake pedals. I am not sure the best way for the repair. |
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02-14-2021, 05:20 PM | #3 |
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Re: Clutch pedal question
The trunion nut and most of those parts are available from the vendors.
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The Master Cylinder Enjoying life at the beach in SoCal... |
02-14-2021, 06:38 PM | #4 | |
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Re: Clutch pedal question
Quote:
I suppose I could ream to whatever opening will work and make a larger pin to fit, I'll think about that. The biggest deal is the setup in the mill, after that it's simple. JayJay
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JayJay San Francisco Bay Area ------------------------ 1930 Murray Town Sedan 1931 Briggs S/W Town Sedan |
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02-14-2021, 06:56 PM | #5 |
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Re: Clutch pedal question
Can you bore, bush, and ream back to 5/8?
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A is for apple, green as the sky. Step on the gas, for tomorrow I die. Forget the brakes, they really don't work. The clutch always sticks, and starts with a jerk. My car grows red hair, and flies through the air. Driving's a blast, a blast from the past. |
02-14-2021, 07:32 PM | #6 |
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Re: Clutch pedal question
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JayJay
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JayJay San Francisco Bay Area ------------------------ 1930 Murray Town Sedan 1931 Briggs S/W Town Sedan |
02-14-2021, 11:23 PM | #7 |
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Re: Clutch pedal question
I have seen trunions worn worse than this and still function.
Turn the trunion around so the pedal rides on the un-worn side, grease it up real good and put it back together. It will last another 90 years. The wear in the pedal probably will not hurt anything. If you every have the pedals out of the car, you may want to do something about it at that time. My opinion, Chris W. Last edited by CWPASADENA; 02-14-2021 at 11:23 PM. Reason: TYPO |
02-17-2021, 01:51 PM | #8 | |
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Re: Clutch pedal question
Quote:
JayJay
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JayJay San Francisco Bay Area ------------------------ 1930 Murray Town Sedan 1931 Briggs S/W Town Sedan |
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02-17-2021, 03:00 PM | #9 | |
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Re: Clutch pedal question
Quote:
As for some measurements to help you restore your shaft, the bore size of the pedal where the A-7508-B bushings locate should be reamed to 0.940". The bushings are to be "line burnished" (i.e.: honed, -not reamed) to 0.8760" - 0.8775". The Trunnion bores are located at 1.1250" from the ℄ of the Pedal Shaft bore to the ℄ of the Trunnion pin bores, and the hole is centered 90° perpendicular from the ℄ of the Pedal Shaft Bushings to the forward face of the Pedal Head. The Trunnion holes are to be reamed at 0.6240" - 0.6255". Additionally there is the limiting stops which are usually worn that will need to be rebuilt (welded and machined) and they index off of the A-7507 Pedal Shaft Collar. As you probably can tell, the Trunnion bores locate from a straight(ened) A-7519-B Pedal Shank, -so to restore the pedal assembly properly, you really need to straighten the shank beforehand. Then the fixture I made uses the tool post to set the height off of the Pedal Shaft, and the limiting stops set the rotational height of the Trunnion Bores. . . |
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02-17-2021, 03:14 PM | #10 | |
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Re: Clutch pedal question
Quote:
Of course, once I think about it I might just say to hell with it and send the clutch and brake pedals to you! JayJay
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JayJay San Francisco Bay Area ------------------------ 1930 Murray Town Sedan 1931 Briggs S/W Town Sedan |
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02-17-2021, 04:27 PM | #11 |
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Re: Clutch pedal question
You will be fine. I guess it all boils down to how 'good' do you want it to be. My typical customer is looking for this level of restoration. Most hobbyists are not that detailed, ...especially when they realize the the amount of time (work) that is involved to restore a component to factory specifications.
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