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clutch rattle

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Old May 5, 2012 | 06:36 PM
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89 F-250 man's Avatar
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clutch rattle

Hi i have a 1989 f250 7.3 idi and i have a horrible rattle coming from the clutch. My rear seal has started to leak so i figuered while i have my transmission out i should fix the rattle.The clutch thats in it has no more than 2500 miles on it the only thing i can figure thats causing my problem is the clutch realese bearing (throw out bearing) if anyone could help it would be well appreciated. thanks
 
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Old May 5, 2012 | 10:05 PM
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Did you replace the dual mass flywheel? If it goes bad it causes a funky ticking/knocking noise at certain engine speeds.
 
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Old May 5, 2012 | 10:18 PM
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well the wierd thing is the only time it rattles is when sitting at idle if you keep it at or above 500 rpms it stops. it also stops rattling when the truck is in gear with the clutch barely ingaged.
 
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Old May 5, 2012 | 10:38 PM
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An easy way to tell if its the flywheel is to listen when you shut the truck off, it will kinda rattle a couple times as the two halves bounce off each other. Otherwise you need to take the inspection cover off and check for play. If you can move the flywheel without seeing the clutch rotate chances are its worn out or has springs missing. The "service limit" is 5/8" but they can move alot more if its bad enough.
 
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Old May 5, 2012 | 10:56 PM
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i just went outside and checked the fly wheel threw the inspection pan witch i already remove do to oil from the rear main seal leaking oil and i couldnt feel any play at all by what ive found from doing reshearch the throw out bearing has two clips on it and i was wondering if one of the clips brock causing it to rattle at low rpms
 
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Old May 6, 2012 | 08:22 AM
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Originally Posted by 89 F-250 man
well the wierd thing is the only time it rattles is when sitting at idle if you keep it at or above 500 rpms it stops. it also stops rattling when the truck is in gear with the clutch barely ingaged.
Do you know if the flywheel has been replaced? If someone has converted the truck to a single mass flywheel,you may be hearing gear roll over, that some get after doing the conversion. Some have reported these same symtems after installing a SMF. Over filling the tranny with fluid by a qt. or so helps to quiet the gear roll over.
 
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Old May 6, 2012 | 10:48 AM
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I went back out this morning and checked again for play in the flywheel i could not fill any but i found that the springs where really loose im guessing that this is my problem
 
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Old May 6, 2012 | 03:43 PM
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Could be. There's plastic keepers that hold the springs in place, they wear out and let the springs rattle around or fall out.
 
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Old May 6, 2012 | 04:32 PM
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i know that when the truck idels at 500 rpms it dosnt rattle is there any way to turn the idel up?
 
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Old May 6, 2012 | 05:11 PM
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on the side of the injection pump that the throttle linkage connects to there is a screw.

let me see if i can find a pic.
 
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Old May 6, 2012 | 05:19 PM
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here ya go. idle should be ~650 rpm.

 
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Old Nov 7, 2015 | 06:07 PM
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Same problem

Hey this is an old thread but did you ever figure out problem. My 97 7.3 5speed Powerstroke does same thing. Rattles real bad unless it's idling at little over 500 rpm. Goes away if I touch throttle or depress clutch.
 
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