1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

Clutch noise

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Old 06-21-08, 04:17 PM
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Clutch noise

Well i installed a brand new clutch and pressure plate, throw out bearing pilot bearing and seal, new front and rear trans seal. When driving on deceleration i get a squeeling noise. It was doing this as my old clutch was going bad so i figured replace it and id be ok but it didnt solve the problmes. Everything is well greased and new gear oil in the trans. Its a high pitched squeel, and as soon as i depress teh clutch it goes away. Its only on decel,, no noise on acceleration at all and it grips pretty hard. Any input would be appreciated
Old 06-21-08, 04:30 PM
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My guess is that because it is only on deceleration we can rule out flywheel condition. You may have to dig deeper into the transmission for a bearing thats toasted. Again, just guesses on my part.

Is it a squeal or a whine sound? Does it cange in pitch with speed or gear chosen?
Old 06-21-08, 08:17 PM
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Does this happen while your in neutral? Depress the clutch and see what happens. We can eliminate a lot of things with this knowing.
Old 06-21-08, 10:18 PM
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sounds like it may be an input shaft bearing issue.. stupid question, but have you checked your belt's tension and are you positive the noise is coming from the trans? how far from cleveland are you? i may be willing to take a trip east to help you out
Old 06-22-08, 06:44 AM
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well it doesnt do it in neutral, its not gear sensitive, its a high pitch squee. .. but i might have found the issue. i was waiting in the mcdonalds drive through, foot on clutch all of a sudden car stalls :-( clutch pedal goes completely limp. i think i might not have bled the clutch properly/ enough or my slave went bad on me causing it to stick and not completely reengage the clutch causing the noise.. so i will update as soon as i bleed my clutch etc etc.. i just got of work so imma eat and sleep tehn figure this out.. and im only 10 min from down town clevo im moved to richmond hts recently so im not far at all..
Old 06-22-08, 07:30 AM
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before you bleed the clutch, check for leaks at the slave cylinder. most notibly you will see fluid dripping onto the bellhousing from the slave cylinder's boot. this can indicate a bad seal on the piston on the slave cylinder. also, look under the dash at the clutch pedal's actuating rod. this rod will connect to the dished piston on the clutch master cylinder. check for fluid leakage there as well. you may also want to check the hose between the master's hard line to the slave. this hose will have a tendency to rub through, crack or collapse internally.
Old 06-22-08, 09:59 AM
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Bleeding a clutch is harder than bleeding brakes because you can't use pedal pressure to compress air bubbles as effectively. The clutch doesn't come up against a hard limit like the brakes; you come up against the soft limit of the pressure plate springs. So the internal hydraulic pressure is less in the clutch lines. Thus, when the bleed screw is released the bubbles are less enthusiastic about escaping.

Most people solve the problem by positively displacing bubbly fluid with new fluid through use of a "power bleeder" that forces good new fluid into the system while draining the old fluid into a waste catcher.

But the squealing sound is probably something different. Doesn't sound like any transmission problem I've ever had, since transmission bearings always made more of a roar than a squeal. Does the sound change when you shift gears?
Old 06-22-08, 12:37 PM
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my clutch makes a squeeking noise during low speed decel...personally i think its the throw out bearing. pushing in the clutch makes the squeak go away
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