Wierd clutch problem with my 69 Coronet RT??
#454922
08/30/09 09:13 PM
08/30/09 09:13 PM
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Posts: 1,149 NW New Jersey
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OK, So I bought this Coronet RT awhile back and didn't have much time to play with it until recently. The clutch worked fine but the pedal would not return all the way back up unless you used the top of your foot. I then adjusted to factory spec so that resistance is felt after the pedal travels 1 inch, and now the pedal returns nicely BUT HERE IS THE PROBLEM... Now when I push the clutch down it bottoms out before hitting the floor. Like the clutch is fully engaged and can't travel anymore on the input shaft. Car appears to be all original. Could I have the wrong ratio z-bar or clutch fork??
1970 Superbird 440 Six BBL, 4-Speed, Dana, FJ5 1969 Daytona Charger 440 4-Speed, Dana, EV2 1971 340 Challenger Conv. Flemington Speedway Pace Car, FC7 1970 340 Six Pack Callenger T/A 4-speed T8 Tan 1971 340 Challenger RT Formal Roof, EV2 w/ V2 Stripe & Orange Houndstooth 1969 Talladega Torino, 428CJ 1969 Gurney Special Cyclone Spoiler II, 351 Cleveland
"Id rather have a bottle in front of me than a frontal lobotomy" Ben Franklin 1755
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Re: Wierd clutch problem with my 69 Coronet RT??
[Re: stumpy]
#454924
08/30/09 10:29 PM
08/30/09 10:29 PM
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Anonymous
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Quote:
That sounds like it's working right to me. It isn't supposed to hit the floor.
Since when?
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Re: Wierd clutch problem with my 69 Coronet RT??
#454925
08/31/09 07:05 AM
08/31/09 07:05 AM
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1970 Superbird 440 Six BBL, 4-Speed, Dana, FJ5 1969 Daytona Charger 440 4-Speed, Dana, EV2 1971 340 Challenger Conv. Flemington Speedway Pace Car, FC7 1970 340 Six Pack Callenger T/A 4-speed T8 Tan 1971 340 Challenger RT Formal Roof, EV2 w/ V2 Stripe & Orange Houndstooth 1969 Talladega Torino, 428CJ 1969 Gurney Special Cyclone Spoiler II, 351 Cleveland
"Id rather have a bottle in front of me than a frontal lobotomy" Ben Franklin 1755
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Re: Wierd clutch problem with my 69 Coronet RT??
[Re: RSI700VIPER]
#454926
08/31/09 07:09 AM
08/31/09 07:09 AM
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Joined: Feb 2003
Posts: 7,595 TX , NJ , FL
WINGCARS_6970
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I think I remember .But wasnt there 2 different length adjusting bolts.From the Z bar to clutch fork
1969 Daytona 440 L9B410772
1970 Coronet 500 383 Presently owned
1970 Superbird 440 U 166242
1970 Superbird 440 U 174597
1970 Superbird 440-6 V 179697
1970 Coronet RT 440 U 224126
1968 Road Runner 426 J 134509
1970 Daytona Replica 318 G 178701
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Re: Wierd clutch problem with my 69 Coronet RT??
[Re: WINGCARS_6970]
#454927
08/31/09 09:15 AM
08/31/09 09:15 AM
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I don 't think the length of the adjusting bar would have any affect as the distance it would travel would be the same, longer or shorter. However, if the fork were longer or shorter, or if the z-bar "leg" where the rods connect too are longer or shorter, this would affect the pedal travel vs. clutch travel ratio. My pedal travel vs throwout bearing travel seems way off.
1970 Superbird 440 Six BBL, 4-Speed, Dana, FJ5 1969 Daytona Charger 440 4-Speed, Dana, EV2 1971 340 Challenger Conv. Flemington Speedway Pace Car, FC7 1970 340 Six Pack Callenger T/A 4-speed T8 Tan 1971 340 Challenger RT Formal Roof, EV2 w/ V2 Stripe & Orange Houndstooth 1969 Talladega Torino, 428CJ 1969 Gurney Special Cyclone Spoiler II, 351 Cleveland
"Id rather have a bottle in front of me than a frontal lobotomy" Ben Franklin 1755
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Re: Wierd clutch problem with my 69 Coronet RT??
[Re: RSI700VIPER]
#454928
08/31/09 04:01 PM
08/31/09 04:01 PM
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John_Kunkel
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I'd guess that a mismatch of parts is the problem.
If the pedal hits a hard stop before it reaches the floor there is probably an overcenter condition somewhere. If the pedal was over-traveling, the pressure plate fingers would hit the clutch disc.
Have somebody sit in the car and operate the pedal through its entire range, you should be able to see what's stopping the pedal.
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Re: Wierd clutch problem with my 69 Coronet RT??
[Re: stumpy]
#454931
08/31/09 07:36 PM
08/31/09 07:36 PM
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What's a PP? It just doesn't feel right. I have a 72 charger rallye w/ 440 and the pedal retuns all the way, and goes to the floor. I don't have to push it all the way to the floor to engage the clutch, but I am able too just the same. My RT pedal stops traveling about 3/4s of the way down if I adjust it so it returns all the way back. Or I can adjust it so it hits the floor, or almost hits the floor, but won't return back to the top without help from my foot. Must be mismatch parts or something with the clutch fingers or throw-out bearing. Is the fork shaft and z-bar unique to 440s? Car has matching 4-speed. Maybe it has the wrong bell housing with the pivot point for the fork shaft closer to the T_O bearing
1970 Superbird 440 Six BBL, 4-Speed, Dana, FJ5 1969 Daytona Charger 440 4-Speed, Dana, EV2 1971 340 Challenger Conv. Flemington Speedway Pace Car, FC7 1970 340 Six Pack Callenger T/A 4-speed T8 Tan 1971 340 Challenger RT Formal Roof, EV2 w/ V2 Stripe & Orange Houndstooth 1969 Talladega Torino, 428CJ 1969 Gurney Special Cyclone Spoiler II, 351 Cleveland
"Id rather have a bottle in front of me than a frontal lobotomy" Ben Franklin 1755
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Re: Wierd clutch problem with my 69 Coronet RT??
[Re: 1fastrunner]
#454933
08/31/09 08:29 PM
08/31/09 08:29 PM
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jim, The shaking when you let the clutch out is either the flywheel needs resurfacing (trued-up) or the crank is bent. I've also seen where someone cut the nib off on the end of the input shaft because the crank was not cut for a pilot bushing which cased vibration. Hard to believe all those items where wrong on your car. Are you sure the guy wasn't fishing?
1970 Superbird 440 Six BBL, 4-Speed, Dana, FJ5 1969 Daytona Charger 440 4-Speed, Dana, EV2 1971 340 Challenger Conv. Flemington Speedway Pace Car, FC7 1970 340 Six Pack Callenger T/A 4-speed T8 Tan 1971 340 Challenger RT Formal Roof, EV2 w/ V2 Stripe & Orange Houndstooth 1969 Talladega Torino, 428CJ 1969 Gurney Special Cyclone Spoiler II, 351 Cleveland
"Id rather have a bottle in front of me than a frontal lobotomy" Ben Franklin 1755
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Re: Wierd clutch problem with my 69 Coronet RT??
[Re: Dougsmopars]
#454939
09/01/09 06:19 PM
09/01/09 06:19 PM
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Anonymous
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Had the same problem with my road runner. Brand new clutch plate throw out bearing resurfaced wheel rebuilt z bar pedal would only come up half way. Also clutch wouldn't last. Could not find the reason or problem finally got pissed off and sold the car. The clutches were Hayes
!!! MAN !!! Some of you give up easy.
Look guys, this is simple. Clutches are simple mechanical devices. I know it's work I'VE BEEN THERE. I've probably had the 4 speeds in/ out of all my various Mopars I've owned some 30 times or more, I wasn't counting. So I know it's work. So get going. Get greasy. Get UNDER there.
First thing to do is inspect the linkage from one end to the other. Inspect the pedal bushings, the pedal, the rods, and espessially the "Z bar." Get a buddy to run the clutch in/out while you crawl under and look for things bending or moving that shouldn't, or not moving that should.
IF all else fails find a friendly friend/ shop/ etc with a press and "jig up" the flywheel, disk, and pressure plate and measure finger travel and disc clearance at release.
Put it back in the car and recheck. Bore a hole in the bell/ shield if you have to, to get a feeler ga. up in between the disc/ pp to check release. Take a GOOD look at things like the fork.
THIS IS SIMPLE MECHANICS and levers. There's nothing complicated about it.
DO NOT easily negate problems you think it "isnt" Is it the correct pp? Does it REALLY fit the flywheel? Right disc? in backwards? Bend/ bending fork/ linkage? Broken mount/ engine moving? Frame bracket loose/ cracked/ bending? Z bar cracked?
There CAN be stuff wrong with pressure plates, junk caught inside between the plate and cover, etc.
Is it the right Z bar? are the levers and rods the correct lenth so that the levers are near 90* to the rods in the "main" part of the swing?
Last edited by 440sixpack; 09/01/09 06:20 PM.
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Re: Wierd clutch problem with my 69 Coronet RT??
#454941
09/01/09 07:38 PM
09/01/09 07:38 PM
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Posts: 1,149 NW New Jersey
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sixpack- lots of good advise. I'll "get greasy" and see if something looks out of place. I suspect though it;'s a mismatch part. Does anyone have the part number for the clutch fork and z-bar as these are the lever multipliers?
1970 Superbird 440 Six BBL, 4-Speed, Dana, FJ5 1969 Daytona Charger 440 4-Speed, Dana, EV2 1971 340 Challenger Conv. Flemington Speedway Pace Car, FC7 1970 340 Six Pack Callenger T/A 4-speed T8 Tan 1971 340 Challenger RT Formal Roof, EV2 w/ V2 Stripe & Orange Houndstooth 1969 Talladega Torino, 428CJ 1969 Gurney Special Cyclone Spoiler II, 351 Cleveland
"Id rather have a bottle in front of me than a frontal lobotomy" Ben Franklin 1755
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