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Tech Talk Technical Discussion About The Nissan 240SX and Nissan Z Cars |
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#1 |
Nissanaholic!
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KA clutch noise question
I have a dual cam KA all stock, just put in a fresh clutch disc, pressure plate, throw out bearing, slave cyl, clutch line, and master, so all of that stuff is brand new. When I start the car cold and push the clutch in it makes a swirling light metal to metal rubbing noise, if I let the clutch out noise goes away, so the noise only ever occurs when I push the clutch all the way to the floor, but it's a little strange because sometimes it won't make the noise until I put it in gear, other times I can pump the clutch a few times until it makes the noise and it will continue making the noise until I lift the clutch off the floor. Once i have it in gear and start to move and i let the clutch out the noise stops. Another weird thing is the closer the engine gets to operating temperature the less frequent the noise happens, and once it is at operating temperature It won't make the noise at all. The clutch operates perfectly, I have zero issues other than this sound.
Now my question (besides wtf is the noise) is will this get worse or cause complications in the future or both or is this something I shouldn't worry about? First thing I thought was the throw out bearing but the throw out bearing is brand new and the noise seems to be operating temp. dependant which makes no sense to me, anyway if you guys have any ideas as to what this phantom noise could be please let me know, thank you in advance
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#2 |
Zilvia Junkie
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i kind of have the same experience as you except this started happening right after i changed my tranny oil. i switched to redline mt-90, and the noise happened. i just ignored it, and its about a year later now and my car is running fine.
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#3 |
Nissanaholic!
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yeah it doesn't seem to affect anything and its just my daily anyway so aslong as it doesn't get worse i could careless lol i just wanna make sure its not a big deal before i completely ignore it
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#4 |
Zilvia Junkie
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It sounds like the clutch cover (pressure plate) is rubbing on the clutch disk. If that is the case, you will develop small burn marks on your flywheel / pressure plate from the uneven mounting of the clutch cover.
Is the noise rotational? Question: What brand clutch kit did you get? Just don't say Valeo....
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#5 |
Nissanaholic!
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Exedy oem replacement clutch, yes it's a rotational sound, but I had the flywheel resurfaced and I torqued everything properly and made sure everything lined up right
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#6 |
Post Whore!
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I'd put money on input shaft bearing, or similar internally. It's strangly more common than the forums lead you to believe, and your symptoms are almost dead-nuts on in regard to how it works. Intermittent, and random, and only when clutch depressed.
Some people like to write it off as a TOB issue, but even on cars with NEW TOB's you can get this noise. In regard to the clutch touching through overextension, you can't do that unless you have the totally wrong (thicker) TOB in it, or a silly long rod in the slave cylinder for some unknown reason.
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