Noise With Clutch Pedal Out
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From: WILLOW AK
Noise With Clutch Pedal Out
99 Super Duty 7.3, 6 speed, replaced the engine. Upon start up I'm getting a light noise from the clutch area when the clutch pedal is released, goes away as soon as I push the pedal down. I did install a new clutch, and pilot bearing during installation. Not sure if it's the pilot bearing, or the throw out bearing. Starting to question if I installed the slave cylinder wrong, though it seems pretty straight forward.
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Usually it's the throwout bearing, they can make some noise if not installed properly or if they're getting worn. The pilot bearing can sometimes make noise but it's not usually in sync with the clutch pedal in/out.
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From: WILLOW AK
yeah, the reason I brought up the pilot bearing was when I removed the old motor the bearing was dried out and in pieces, I replaced it with a new roller bearing. I have a new throw out bearing in it, seemed like a pretty foolproof install. I wondered about the two plastic tabs sticking out of the shaft where it meets the clutch fork, but I guess they're supposed to break off upon new installations, though I reinstalled the original cylinder. I don't quite understand what keeps the throw out bearing retracted from the pressure plate during normal operation?
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It's been a while since I've been into one, but the last time I remember one was my dad's old '94 GMC. We couldn't use the roller bearing for the pilot because it seems like the tip of the input shaft was slightly undersize, so we ended up using a bronze bushing, oil impregnated. Worked fine and after a little wear-in was just fine.
As for the throw-out bearing, I want to say that if it ISN'T just touching the pressure plate, it'll rattle a bit, because it's essentially 'freewheeling' on the input shaft which isn't good for any bearing. They need at least a slight load to be quiet. Does your clutch pedal have a little 'play' in it before you really have to start pushing on it, or does it start to disengage the clutch right away? You might need to adjust it a bit more. It will quiet down as you give it some throttle because you're managing to put just a little more pressure on the bearing through rotational speed, which quiets them down.
As for the throw-out bearing, I want to say that if it ISN'T just touching the pressure plate, it'll rattle a bit, because it's essentially 'freewheeling' on the input shaft which isn't good for any bearing. They need at least a slight load to be quiet. Does your clutch pedal have a little 'play' in it before you really have to start pushing on it, or does it start to disengage the clutch right away? You might need to adjust it a bit more. It will quiet down as you give it some throttle because you're managing to put just a little more pressure on the bearing through rotational speed, which quiets them down.
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From: WILLOW AK
Thanks for the input !! Very informative. Putting everything back together I too noticed some wear on the input shaft and considered a bronze bushing but I live in a pretty rural area and had to use what was available. There doesn't seem to be any adjustment for the clutch, but it feels like it always has in the past and appears to shift fine. My driveway is pretty long (1/4 mi.) and part of it washed out this spring. I drive to town on Fridays about a 100 miles round trip, we'll see how it does, I have to do driveway repairs soon, don't have time to keep tinkering with her....
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They're a bit more expensive, but you can buy your own bronze bushing and machine it to the size you need if you've got some rudimentary equipment. Heck I've done it with a drill press in a pinch but it's not PERFECT, thankfully bronze oil-impregnated bushings don't need to be.
If you ever need something like that and your local auto parts store doesn't carry it, go to McMaster-Carr (www.mcmaster.com) and see if they've got what you need or something close...they usually do.
If you ever need something like that and your local auto parts store doesn't carry it, go to McMaster-Carr (www.mcmaster.com) and see if they've got what you need or something close...they usually do.
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