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Old 03-12-2020, 02:41 AM   #1
Chris Van
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Default New clutch: Judder from hell

Hi boffins:

I have just had a branch new clutch and pressure plate fitted to my '31 Town Sedan and the judder as I pull of is so brutal that it tries to shake the car to pieces. Once it "bites" though it's fine and there is zero slip.

The mechanic said he used the V8 clutch, which is apparently the same as the regular Model A clutch.

I want to take the car to a different mechanic but I need to tell him what to do. Here in South Africa skilled Model A mechanics are almost non existent.

Thanks a million. Driving me nuts.
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Old 03-12-2020, 06:33 AM   #2
Patrick L.
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Default Re: New clutch: Judder from hell

The V8 clutch and the 'A' aren't the same.
There are several things that can cause the 'judder' ranging from warped flywheel and mis-adjusted pressure plate fingers and mis-aligned bell-housing/clutch cover.
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Old 03-12-2020, 07:06 AM   #3
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Default Re: New clutch: Judder from hell

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Originally Posted by Patrick L. View Post
The V8 clutch and the 'A' aren't the same.
There are several things that can cause the 'judder' ranging from warped flywheel and mis-adjusted pressure plate fingers and mis-aligned bell-housing/clutch cover.
Patrick, can V8 clutch AND pressure plate be used?
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Old 03-12-2020, 07:15 AM   #4
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Default Re: New clutch: Judder from hell

[QUOTE=Chris Van;1861149]Hi boffins:

I have just had a branch new clutch and pressure plate fitted to my '31 Town Sedan and the judder as I pull of is so brutal that it tries to shake the car to pieces.
Chris I had the exact same issue but using Model A clutch, Advice from fellow A Gurus. Try starting off in 2, 3 gear almost to point of slipping clutch , I done this numerous times , almost stalling engine , done this every time I drove car for several days . clutch seemed to seat and hold after a few days , no noises or chatter.
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Old 03-12-2020, 08:33 AM   #5
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Default Re: New clutch: Judder from hell

When I changed to a V8, 8N ford PP, I machined the PP from 63 lbs. down to 36 lbs. on a lathe and drilled and tapped the holes on a mill, so the new PP will fit.
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Old 03-12-2020, 09:19 AM   #6
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Default Re: New clutch: Judder from hell

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Start with adjusting the pressure plate fingers. That would be the easiest and is probably your problem.
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Old 03-12-2020, 10:19 AM   #7
Bob Bidonde
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Default Re: New clutch: Judder from hell

I had the same issue, and I solved it by adjusting the front engine mount. Tighten down on the springs to change the response frequency of the new clutch.
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Old 03-12-2020, 11:36 AM   #8
Russ/40
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Default Re: New clutch: Judder from hell

The early 32, 33 and I think 34 , V8 pressure plates were the same as the model A.

I had the same problem, but the more I drove it, the better it got. The slipping of the clutch, and 2nd gear starts does in the long run actually help in time.
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Old 03-12-2020, 11:58 AM   #9
ryanheacox
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Default Re: New clutch: Judder from hell

My clutch chatter was solved with a finger adjustment. Instructions said do not adjust so I didn't when I installed it... none of the fingers were the same height.
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Old 03-12-2020, 12:20 PM   #10
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Default Re: New clutch: Judder from hell

When I think V8 clutch, I think of the 9-inch Long type but the flywheel has to have the lip machined down to use it. Some of the new 9-inch pressure plates are crap so a person has to know where to shop or have an old original rebuilt by a good shop like Fort Wayne Clutch.

Torque tube drives can put a lot of pressure on the motor mounts. If they are loose in any way then the engine will move around all over the place when engaging the clutch. Worn float-a-motor sets would likely be more problematic than OEM sets but either one can get loose.
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Old 03-12-2020, 06:03 PM   #11
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Default Re: New clutch: Judder from hell

When you have the clutch disk out of the car check it carefully for a lump or thick spot. Had that happen to a friends car. Drove us crazy until we carefully measured the thickness and found the bump. New disk and all was well. Only put the engine in and out of the car four times before we found it.
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Old 03-13-2020, 03:08 AM   #12
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Default Re: New clutch: Judder from hell

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Originally Posted by 1crosscut View Post
When you have the clutch disk out of the car check it carefully for a lump or thick spot. Had that happen to a friends car. Drove us crazy until we carefully measured the thickness and found the bump. New disk and all was well. Only put the engine in and out of the car four times before we found it.
Only 4 times? Ouch I feel your pain and frustration.
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Old 03-13-2020, 10:31 AM   #13
DBrer
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Default Re: New clutch: Judder from hell

Can only imagine the frustration level of removing the engine four times, wow!
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Old 03-13-2020, 02:55 PM   #14
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Default Re: New clutch: Judder from hell

probably an imported pressure plate i understand the are not good,have an original v/8 Ford rebuilt.
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Old 03-13-2020, 05:10 PM   #15
TerryH
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Default Re: New clutch: Judder from hell

I had the flywheel lightened and a V-8 clutch and pressure plate installed about 14 years ago, by our local Model A mechanic, and have never had any issues with it, even from the start. Much less clutch pedal pressure with that setup......
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