whine unless clutch pushed in
#1477346
07/31/13 10:50 PM
07/31/13 10:50 PM
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Joined: Dec 2012
Posts: 14
r3dplanet
OP
member
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OP
member
Joined: Dec 2012
Posts: 14
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Hi there.
I have a '65 Barracuda with a newly built 360 and an A833-OD gearbox. The car has been complete for more than a year but I've been slowly chasing a few gremlins and sounds resulting from changing so much equipment. Last year I replaced the radiator, engine, carburetor, intake, power steering (pump, gear, and hydrobooster), aluminum bellhousing, gearbox, driveline, front disc brake conversion, 8-3/4" rear diff, and exhaust. I'm still stuck with the 273 manifolds but that's a discussion for another time.
I have a clear problem where I hear an distinct engine whine that's hard to echo-locate, but it seems to come from the rear of the engine about where it meets the firewall. The pitch of the whine corresponds to the rpms - so at 3,000 rpms the whine is the same note. When the car starts in gear from a dead stop and the revs build up, I hear a corresponding whine. The same happens in second, third, and fourth. That is, as the speed of the engine increases so does the pitch of the whine. I can even hear it in neutral a little. BUT when I push in the clutch ( a new Centerforce 10.5" clutch ) the whine disappears. It also disappears when I push in the clutch to change gears.
What can this be? The shop who rebuilt my gearbox absolutely maintains that it isn't the transmission. So I'm wondering what it might be now - throwout bearing? Input shaft? Crank bushing? Z-bar? Clutch fork? I've been trying to figure this out for a while but I'm out of ideas.
Thanks for any insight, Marcus
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Re: whine unless clutch pushed in
[Re: 340SHORTY]
#1477349
07/31/13 11:56 PM
07/31/13 11:56 PM
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Joined: Sep 2007
Posts: 14,889 up yours
Supercuda
About to go away
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About to go away
Joined: Sep 2007
Posts: 14,889
up yours
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Sounds like the throwout bearing is touching the clutch fingers when the clutch is released to me.
They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.
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Re: whine unless clutch pushed in
[Re: Supercuda]
#1477350
08/01/13 01:07 AM
08/01/13 01:07 AM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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I am not a clutch guy but what Supercuda said, I'd shorten the clutch fork threaded adjuster rod to get the throwout bearing off of the fingers & see if it dissappears. Do ya feel lucky. Count the # of turns to easily return it to its' original length if that ain't it
live every 24 hour block of time like it's your last day on earth
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Re: whine unless clutch pushed in
[Re: r3dplanet]
#1477352
08/01/13 01:59 AM
08/01/13 01:59 AM
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Joined: Jun 2006
Posts: 125 kalispell montana
jwilson 61
member
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member
Joined: Jun 2006
Posts: 125
kalispell montana
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Transmission input bearing if it goes away with clutch pushed in
70 cuda 440 6bbl Auto with a dana 60 68 road runner QQ1 383 auto 1970 6 barrel 4 speed Superbird FY1 number matching 15 Challenger 6.4 SRT pearl White 6 Speed 72 Cuda 440 5 speed 71 Road Runner 440 4 speed
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Re: whine unless clutch pushed in
[Re: jwilson 61]
#1477353
08/01/13 07:53 AM
08/01/13 07:53 AM
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Joined: Jan 2003
Posts: 4,664 Newfoundland
mopar_man
master
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master
Joined: Jan 2003
Posts: 4,664
Newfoundland
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Usually when the throw -out bearing is failing it starts to whine when the clutch is released. it is possible that it is failing and the T/O bearing is still touching the fingers when released causing it to whine . And of course it could be the front bearing in the tranny. It could also be crank related, when you press the clutch in, it tries to push the crank forward and it will if the truss bearing is bad but when you release the clutch the crank will return to the Goldylocks zone (lol) and the whining starts again
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Re: whine unless clutch pushed in
[Re: JohnRR]
#1477356
08/01/13 06:28 PM
08/01/13 06:28 PM
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Joined: Aug 2003
Posts: 1,062 Amherst,NY
challengermike
super stock
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super stock
Joined: Aug 2003
Posts: 1,062
Amherst,NY
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Quote:
Quote:
sounds like the throwout bearing or a bearing in the trans.
Trans , TO bearing would make noise when he pushed in the clutch.
But it could be not adjusted correctly and turning all the time. Its hard to diag a problem like this from a computer. But I agree it wouldn't make noise when its not touching.
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Re: whine unless clutch pushed in
[Re: Supercuda]
#1477357
08/01/13 10:02 PM
08/01/13 10:02 PM
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Joined: Jan 2003
Posts: 5,447 So Cal
Sinitro
master
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master
Joined: Jan 2003
Posts: 5,447
So Cal
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Quote:
Quote:
Very good. The clutch pedal itself feels perfect with just the right amount of free play. But tomorrow I'll loosen up the adjuster and see what happens.
Best way to set clutch free play is at the clutch, not the pedal. Shoot for a .060" gap with the pedal fully depressed. Then release the pedal and make sure the TO bearing is not riding on the fingers.
Free play @ the pedal has litle relevance with 40 year old parts.. Crawl underneath, pull the clutch cover and adjust the rod so that the throwout bearing is pulled back from the pressure plate about 1/8"....
Just my $0.02...
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