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03-29-2016, 02:39 PM | #1 |
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throw out bearing
new to Model A but willing to learn, got a issue with clutch /pressure plate and throwout bearing. i never had the experience of disassembly only the pleasure of reassembly, anyway the flywheel is mounted and clutch disc sandwiched between flywheel and pressure plate , aligned with tool ,all good. throw out bearing return spring replaced and new clutch disc. Gear box installed . Heres my problem . when depressing clutch peddle , bearing easily slides forward but doesn't come near fingers on plate and only with peddle completely depressed to its full travel does it just barely touch fingers. what is missing ?
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03-29-2016, 02:50 PM | #2 |
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Re: throw out bearing
Have you adjusted the free play in the pedal?
Bob |
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03-29-2016, 04:38 PM | #3 |
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Re: throw out bearing
thanks for reply Bob, i have engine and trans on a bench, with inspection cover off looking at throwout bearing if i travel clutch lever its full travel the bearing moves towards fingers but will not contact them after full travel . am i missing something ?
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03-29-2016, 04:48 PM | #4 |
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Re: throw out bearing
Have you adjusted the linkage from the pedal to the throw out bearing shaft? There is a threaded rod that goes between the two and adjusts the amount of travel.
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03-29-2016, 04:54 PM | #5 |
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Re: throw out bearing
Could it be you have a throw out bearing carrier from an AA truck?
They are quite a bit shorter... Can you post a picture? Here is a picture Bob C posted some time ago on a different thread...
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Early '29 CCPU that had a 4-speed, but not any more.......in the family since '62 Last edited by 1955cj5; 03-29-2016 at 05:17 PM. Reason: Picture |
03-29-2016, 05:01 PM | #6 |
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Re: throw out bearing
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03-29-2016, 05:06 PM | #7 |
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Re: throw out bearing
throw out style body is the longer type
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03-29-2016, 05:15 PM | #8 |
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Re: throw out bearing
It's possible you have the disc in backward, if so it will compress the pressure plate moving the release arms inward.
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03-29-2016, 05:31 PM | #9 |
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Re: throw out bearing
thanks for suggestions, will try to post a picture , disc not in backwards ,it fit flush on flywheel and can see cushion springs while looking inside cover.
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03-29-2016, 05:38 PM | #10 | |
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Re: throw out bearing
Quote:
Pictures will get you the information that you seek ! You do not say, but I'm wondering ...are you working on stock setup, i.e.-trans/pressure plate, etc....? |
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03-29-2016, 07:30 PM | #11 |
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Re: throw out bearing
The 6 fingers should be 11/16" in from the surface of the pressure plate. A simple tool to make is a 5" piece of aluminum channel with a 1/4" bolt and nuts in the center, so you can lay the channel across the face and slip a feeler gauge between each arm and the bolt head to make sure it's 11/16". It can be plus or minus 1/16" from the 11/16", but make sure all 6 fingers are exactly even.
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03-29-2016, 08:08 PM | #12 |
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Re: throw out bearing
Agree with Tom. Adjust the PP fingers. It is easy enough with the engine out. Lots of threads on this.
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03-29-2016, 08:19 PM | #13 |
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Re: throw out bearing
Here's a link to a thread showing the tool I just mentioned:
https://www.fordbarn.com/forum/showth...e+tools+clutch And here's a link to the electronic clutch adjust tool I made: https://www.fordbarn.com/forum/showth...e+tools+clutch |
03-30-2016, 05:13 AM | #14 |
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Re: throw out bearing
thanks Tom , trying to get back at car to take a picture, but while looking into inspection cover shouldn't T O bearing be near fingers? mine appears to slide forward 3 or 4 inches before coming in contact with fingers , the bearing body is long style.
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03-30-2016, 05:17 AM | #15 |
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Re: throw out bearing
yes its all stock setup.
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03-30-2016, 08:14 AM | #16 |
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Re: throw out bearing
Yes, when the tranny is mounted in the car and the linkage connected, the throwout bearing will be very close to the 6 fingers. Until the linkage is connected the return spring will pull it back as far as it can move.
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03-30-2016, 09:21 AM | #17 |
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Re: throw out bearing
This is how my external linkage looks with approximately 1" of free travel in the pedal..
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Early '29 CCPU that had a 4-speed, but not any more.......in the family since '62 |
03-30-2016, 10:25 AM | #18 |
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Re: throw out bearing
My guess is you have a sheared pin on either the fork that moves the throwout bearing or the leaver that is moved by the pedal. Grab both and see if one or the other moves on the shaft.
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03-30-2016, 10:54 AM | #19 |
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Re: throw out bearing
Times 2 something to check
Last edited by Mitch//pa; 03-30-2016 at 06:03 PM. |
03-30-2016, 05:03 PM | #20 |
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Re: throw out bearing
guys i gotta say thank you, situation remedied, as suggested fingers on pressure plate off by a mile, i am using original p.plate, problem was i purchased a aftermarket clutch disc , it may be ok but way to thick , noticed while taking off p.plate that fingers came out and while reattaching the fingers were drawn in. gotta say a special thanks to Tom and his simple but effective adjustment tool and his words of wisdom. thanks again
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03-30-2016, 05:05 PM | #21 |
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Re: throw out bearing
How can the T O bearing be 3"-4 " away from the fingers? Sounds very wrong.
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03-30-2016, 05:27 PM | #22 |
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Re: throw out bearing
while bolting on pressure plate with aftermarket disc clutch fingers drawn in so deep that T O bearing had to travel full length to even touch fingers that were already compressed.
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03-30-2016, 05:49 PM | #23 |
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Re: throw out bearing
A new disc will have a much thicker lining than a worn disc and this will make the pressure plate fingers move in more. I've never heard of a disc that had too thick a lining.
How thick is the new disc? BTW, I had to adjust the fingers on the last new pressure plate I installed. They weren't even with each other, and they were quite a bit off the 11/16" correct depth. |
03-30-2016, 06:01 PM | #24 |
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Re: throw out bearing
hey Tom , maybe i used a canadian expression , To Thick, the new disc is a good bit thicker than old used one , i don't have exact measurement on hand, disc was purchased from vendor in Calgary Alberta who markets Macs parts, i also noticed that the adjustment nuts were back until no thread was showing on screw, with 11/16 adjustment several threads are showing. i have two other plates and original discs and no threads showing on either of those two. i think in the end that the new disc is cheap and mass produced with no attention to detail....just to get job done
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03-30-2016, 07:47 PM | #25 |
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Re: throw out bearing
Your replacement plate may be significantly thicker for a reason, and not necessarily a bad one.
Many plates after the 30's were made with Marcel carriers. Separate from the center hub torsion springs, a Marcel carrier adds a wavy flat spring plate under the friction material on one or both sides of the disc. This eliminates chatter and jerky engagement while providing a broad, gentle friction point feel. Your old plate may have had only the hub springs and a solid riveted lining, or perhaps a single sided, thinner, or less aggressive Marcel design. A Marcel carrier (wave spring under the friction material) makes for a thicker plate. |
04-01-2016, 04:15 PM | #26 |
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Re: throw out bearing
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Do you happen to have a 'Marcel' type disc which can fit/be used in A/B ? If so, would you please give me a part number |
04-01-2016, 04:43 PM | #27 |
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Re: throw out bearing
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04-01-2016, 05:20 PM | #28 |
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Re: throw out bearing
Hardtimes, I have one with SMM73 on a box marked "Master Clutch". It is a single center Marcel with six center torsion springs captive on both sides. I bought six of them at Hershey several years ago, used five, and have only the one left, slated for a diaphragm PP behind a R2P now on my bench. I do not recall who the vendor was. If I could find discs equal in quality I would buy more. That number cross-ref's to APRA# CD688 but ordering one of those gets you the typical recent vendor trash with center torsion springs caged on one side only.
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04-01-2016, 09:46 PM | #29 |
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Re: throw out bearing
Hey Mike,
Thanks ! Too bad that that disc is not readily available. It appears to have the right stuff. And your use of it confirms that. I don't think that a lot of guys realize the importance of the 'captured' springs, and the problems that they prevent. That's what caught my attention. |
04-03-2016, 09:44 AM | #30 |
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Re: throw out bearing
hey rosella, you were the first with the KISS syndrome , Keep It Simple Stupid. and i thank you for that, i think that this forum is a wealth of knowledge , extremely professional but if you make a mistake , with terminology or description of a part or situation be prepared to be hit with insults and crap, i am up for that from both sides but i will be barred from side. TIMES 2, and you know who that is. anyway look on the map folks i am in Newfoundland Canada , drop by
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