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clutch size and chatter |
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dafox99 
AMC Apprentice 
Joined: Jun/06/2017 Location: austin, tx Status: Offline Points: 45 |
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 Topic: clutch size and chatterPosted: Oct/20/2017 at 11:08am |
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AMC team. I bought a '66 Marlin a few months ago. Mechanicals are really good, except for clutch chatter. When I pulled it, I found the pressure plate was about 2" smaller in diameter than the flywheel. I tried to find a clutch for it (66 Marlin with 232). Found a ton of them for V8s, but couldn't find one for the six. It looked just fine (actually looked new), so I re-surfaced the flywheel, and put it back together. I did that nutty cable adjustment per the manual. It's better, but I still have a fair amount of bounce when it engages. Any thoughts?
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Lyle
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Joined: Jul/17/2014 Location: None Status: Offline Points: 772 |
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Posted: Oct/21/2017 at 7:44am |
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Several thoughs:
Wrong throw out bearing that's not putting even pressure on the clutch - ID to large. Clutch type - tree finger vs diaphragm. A three finger with any distorted part will chatter. Miss alignment of transmission to motor or transmission shaft to flywheel bushing. Contaminated clutch friction material. Flywheel is not flat. Worn or wrong flywheel bushing. If the clutch fits the transmission, bell and flywheel then it does not matter if it's a V8 or S6 as long as the pressure to depress it is within the design range of the vehicle engagement mechanism. i.e. that clutch may be wrong and too small for the load it's to transfer.
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6PakBee
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Charter Member Joined: Jul/01/2007 Location: North Dakota Status: Offline Points: 5458 |
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Posted: Oct/21/2017 at 9:26am |
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The only thing that I could add to Lyle's excellent list is that the disc is bent.
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Roger Gazur
1969 'B' Scheme SC/Rambler 1970 RWB 4-spd Machine 1970 Sonic Silver auto AMX All project cars. Forum Cockroach |
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dafox99
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Joined: Jun/06/2017 Location: austin, tx Status: Offline Points: 45 |
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Posted: Oct/21/2017 at 11:02am |
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Great list, Lyle.
I think I can rule out the flywheel as I had it surfaced, but I think my next step is to replace the clutch. That should eliminate a fair amount of the issues. The surfaced looked good, and the guy I bought it from said it was new, but I don't think it is the right one. Again, the clutch disk looked good, but was smaller than the flywheel surface. The big hard thing is finding one. I found lots for V8s, but not 6's, and I assume they won't bolt up.
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73Gremlin401
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Joined: Mar/02/2013 Location: Stmbt Sprgs CO Status: Offline Points: 955 |
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Posted: Oct/21/2017 at 1:39pm |
Don't worry about the clutch being smaller in diameter than the machined area of the flywheel - bigger overall diameter doesn't equate better, especially with smaller displacement motors - it's just more mass that the motor has to get spinning. AMC also, especially in later years, swiss-cheesed the flywheels with numerous mounting bolt possibilities to allow the same flywheel to be used in several different engine & clutch applications. I don't know for certain if early flywheels like yours were similarly prepared. |
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73 Gremlin 401/5-spd.
77 Matador Wagon 360/727. 81 Jeep J10 LWB 360/4-spd 83 Concord DL 4-dr 258/auto  |
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limachine
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Joined: Apr/02/2009 Location: Long Island Status: Offline Points: 151 |
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Posted: Oct/21/2017 at 7:22pm |
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I've seen some clutch materials do strange things if they're not broken in properly, specifically Hayes and McLeod. I love my diaphragm McLeod, once they break in they're sooth as silk. Until they do, they can do all kinds of things. Hayes and similar clutches tend to chatter like mad. I'm also going to add a bent fork to Lyle's list. I've seen the forks spread and bend or wear uneven, throwing uneven pressure on your clutch. You're actually slipping a small area. Also check you're not stroking over center.
As for the size, isn't it the same as a small Chevy - 10 1/2" coarse? I went with a "Corvette" clutch kit and substituted the right pilot and throwout bearing. |
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First_Gear
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Joined: Jan/18/2010 Location: Mukilteo WA Status: Offline Points: 644 |
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Posted: Oct/23/2017 at 9:02pm |
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Yay something I can help you with. I too ran into the clutch debacle. I found this:
https://www.ebay.com/itm/AMC-HD-Clutch-Kit-Pressure-Plate-Clutch-Disc-AMC-10-R-/182370802760?hash=item2a76259c48 Its larger but still fits on the flywheel. Seems to be high quality and stronger than the stock one. I have not run the car with this yet but I put it on the flywheel and all the holes match up and it looks like its going to work. This is in a 66 rambler classic with a T96J transmission. My clutch was 9 1/4". One other thing no one has mentioned. Does your car have the wonky 66 only self adjusting clutch?? If so I would recommend ditching it like amc did in 67. Find a car with the standard linkage or do what I did. I used a wilwood master and converted mine to hydraulic. I added metal to the stiffener that is already there. I wanted it to look stock. I really need to create a build thread for my car!
Edited by First_Gear - Oct/23/2017 at 9:08pm |
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mmaher94087
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Joined: Apr/01/2008 Location: Arizona Status: Offline Points: 1690 |
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Posted: Oct/23/2017 at 9:40pm |
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If the "chatter" occurs when the clutch pedal is first engaged then I'd vote that you have the wrong T/O bearing collar. If too big, then they will wobble on the tranny front bearing retainer (AKA; tranny snout)and cause all kinds of noise.
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Mike
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dafox99 wrote: