Clutch problem question.

I got a problem with clutch sliping. I have bought my nissan 240sx from used car delaership and the owner sed that he has changed the clutch for brand new one and I have no reason not to belive him. The clutch doesnt constontly slip some times i drive and i can rev engine to 4000 rpm drop the clutch and it will grip in any gear, but few times it would all of a saden start to slip like there is no tomorow and it feels like the clutch is gone. My first guess was clutch fade but that was thrown out the window with my resent experience when i drove to my frinds house really close by, riping it there and no problems but when i left his house 30 min later right away my clutch started to slip really bad but after we stoped at place where we went to and i had to go back after about 30 min the clutch was fine again. Today i was driving and all of a suden the problem came back so I stoped and tryed to smell if clutch over heated since i was driving in traffic and using clutch alot but no smell so it didnt look like it was over heated, later on the day my dad drove the car and since he didnt say anything to me about clutch i think its working fine again:banghead: . Now I never head to deal with clutches before since i learned to drive on automatics so i dont have much experience in this area but my next guess is, is it air in the hydrolic system some where could that be the reason?:uhoh:

IM really sorry about all the spelling mistakes i know there are way to many so you dont need to tell me that. This is my seconed language:banghead:

try checking your clutch master cylinder

maybe the clutch wasnt broke in properly

nah if it was slippingthat bad hed smell it. id bet either MC, slave cylinder, or transmission problem. check for leaks in the hydraulic system, and change the transmission fluid. look for metal shavings in the fluid.

OK thx ill do that this weekend. I dont really think its transmision itself couse if gears were screwed up it wouldnt be on and off like this at least i dont think it would but ill check that any way just to make sure.

ok here is a new thing i noticed that might clue you guys in to my problem. When i first start my car in the morning my clatch starts to grip with only 1/4 of the pedal released when i drive and its all fine its about betwen 1/4 and 1/2 but when the problem starts it starts to grip when pedal is 7/8 out :uhoh: .

I don't see how it could be in the hydraulic system, that would only PREVENT you from disengageing the clutch.

When my clutch was slipping, as it did for nearly 6 months before it finally gave out, it always had 4x the grip when cold.

Money is on these thoughts:
Clutch Master Cylinder preventing Slave Cylinder from retracting,
Clutch was not replaced with new clutch (used clutch worn in differently)
Only disc was replaced, not pressure plate
Flywheel was in bad shape and not turned.

All these items could give you the symptoms you've been experiencing.

Thoughts to rule out:
Bad Slave Cylinder, (if it was sticking you'd probably notice in pedal, they usually leak and fail, not allowing you to disengage clutch)
Leaking rear main seal, (Grip should increase as dripping oil is burnt off)
Air in Hydraulic Lines, (once again only preventing to disengage clutch / and gives soft pedal)
Gear's failing or bad Gear oil would not give you these symptoms (and when looking at metal shavings, there will ALWAYS be metal shavings, usually you are lookings for BIG pieces of metal shavings indicating failure, not wear)

No "easy" fix. You are going to have to have the Tranny pulled and something replaced. If you can do it yourself aftermarket clutch and pressure plates are cheap.

About you'r clutch problem that you used to have. That was clutch fade which is a sign of worn clutch, when clutch is worn its thiner and disopates heat slower so it get hotter faster then it starts to slip. Thats what i tyhought at first but in my case clatch starts to slip at any time and it starts to slip bad. Like is ed before i went to my frinds house ripping it all the way there and it was gripping yet when i left about 30 min later it started to slip imedietly and then after i was parked at place where we went to for about 30-60 min it was fine again. Or it hopened to me on high way one min it was fine the otehr one it all fo a sadden started to slip bad and there was no clatch smell even when i got out, if it was clatch fade and it was slipping that bad I would of smelled it with out geting out of the car.

IM still gona bleed the system on the wekend and check the master cylinder and maybe slave cylinder as well if i can get to it and see if it does any good if it doesnt im gona check if the clatch in teh car was changed or the guy just bsed if he did hell be in alot of shit for bsing.

Make sure when you figure it out you give us an update, I'm very curious what this is!!!

K will do. So far by the looks of it my friend an I decided it has to be eather clutch master cylinder or clutch slave cilinder that got lazy and not retracting properly sometimes so the clutch doesnt engage back properly. I guess will see when ill have a chance to do full repair on it.

Well, don't forget that the only thing PUSHING the slave cylinder back is the pressure plate itself. So don't rule that out.

I'm having the same problems as you right now, drive the car for 30 min, starts slipping like crazy. But if it sets for a while, the clutch grabs really hard.

I did some checking and found out that there was no clutch pedal play, which may be causing the clutch not to engage all the way, which could cause it to slip after it gets hot enough.

so I just adjusted the pedal height and got it straightened out.

so we'll see how it does.

pressure plate and the throw out bearing seems probable... when the 'clutch' is replaced in the first place those are the items that need replacing as well... which in your case they probably werent.

K this is not 100% yet but it has been fine for 2-3 weeks. What i have done is adjusted the clutchpedal under the steering wheel. What might have been the proble was wrong adjustment. When i was adjusting it I noticed when pedal is fully released there was still tension on the rod that goes in to break slave cylinder so basicaly my clutch was never engaged properly so when it warmed up it would start to slip since it was preaty much same thing as keeping ur foot on the clutch all the time it would slip soner or later so hopefully that was it. But still even tho i hope this has fixed the problem I still cant figure out why sometimes it would slip right after sitting some where for 30 min after i drive it.

not to steel but my freind just installed a clutch and now when the clucth is pushed in the pedal stays to the floor. Is it possible the rod is not hitting presure plate?

Yup, sounds like the line hasn't been bled enough, therefore it's not pushing on the clutch, nor, is the clutch pushing back against it.