Clutch trouble
#1
Clutch trouble
Hey fellas,
A few months ago my clutch master cylinder was leaking so I replaced it. Clutch operated very normally till two weeks ago when the clutch started slipping on the highway. For example, I would be going 60mph at 2600 rpm or something, push down on the gas to get over a hill, and suddenly the rpms would jump up to 3500 and speed would not change.
The engine and clutch only have about 6000 miles on them and it was assembled properly, so I figured the slave cylinder might be having trouble. I bled it, and the clutch operation went back to normal. Sounds like it just got a little air in it, right?
Well a week later the same thing occurred, again corrected by bleeding the clutch. Does this sound like the slave cylinder needs to be replaced? Anyone had this trouble before?
A few months ago my clutch master cylinder was leaking so I replaced it. Clutch operated very normally till two weeks ago when the clutch started slipping on the highway. For example, I would be going 60mph at 2600 rpm or something, push down on the gas to get over a hill, and suddenly the rpms would jump up to 3500 and speed would not change.
The engine and clutch only have about 6000 miles on them and it was assembled properly, so I figured the slave cylinder might be having trouble. I bled it, and the clutch operation went back to normal. Sounds like it just got a little air in it, right?
Well a week later the same thing occurred, again corrected by bleeding the clutch. Does this sound like the slave cylinder needs to be replaced? Anyone had this trouble before?
#2
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don't forget i am the Y/T idiot when i answer this. have you had somebody pump the pedal to make sure the release cylinder is releasing all the way? generally, when the rpm's climb like you describe, the clutch is slipping. do you have a remain seal leaking, maybe? i know you said it is only 6000 mile since rebuild. that is my .01 worth.
#3
Contributing Member
iTrader: (3)
don't forget i am the Y/T idiot when i answer this. have you had somebody pump the pedal to make sure the release cylinder is releasing all the way? generally, when the rpm's climb like you describe, the clutch is slipping. do you have a remain seal leaking, maybe? i know you said it is only 6000 mile since rebuild. that is my .01 worth.
#4
A leaking seal would cause oil to get on the clutch and then it would slip all the time. That wouldn't explain why bleeding the clutch alleviates the symptoms.
And no, the rear main seal wouldn't leak after 6000 miles.
I'll change the slave cylinder and give you an update.
And no, the rear main seal wouldn't leak after 6000 miles.
I'll change the slave cylinder and give you an update.
#7
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May be your slave , if your having to bleed it repeatedly then air is getting in the system somewhere and unless you see a visible line leak then that would be the place to go , after all its only a few things envolved with the air in the system problem unless you have trapped air in hydraulic clutch system and it is migrating .
Oil leaks at Trans or Main Seal would have to be very substanstail generally to cause slippage and the slippage is generally pronounced across the operating range so I don't think that is your problem.
Check for leaks closely and bleed the system well , if slave is bad enough to cause that it generally is leaking also but can have a problem with the cylinder sticking from wear or varnish without leaking as well , hate to see you replace and then that not solve your problem but if the clutch installation is good then that would be the way to go since you have already replaced your MC taking for granted there are no leaks where system could suck air as well , when you have to bleed again is the fluid level lower at that point ?
Oil leaks at Trans or Main Seal would have to be very substanstail generally to cause slippage and the slippage is generally pronounced across the operating range so I don't think that is your problem.
Check for leaks closely and bleed the system well , if slave is bad enough to cause that it generally is leaking also but can have a problem with the cylinder sticking from wear or varnish without leaking as well , hate to see you replace and then that not solve your problem but if the clutch installation is good then that would be the way to go since you have already replaced your MC taking for granted there are no leaks where system could suck air as well , when you have to bleed again is the fluid level lower at that point ?
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#8
Well, I changed the slave cylinder, and it was doing fine for a while, then started having the same slippage problems.
I drove it around and then cracked open the slave cylinder bleeder - there was pressure! So that means the system was not de-pressurizing. I checked the FSM and it said to adjust the pedal to have 5 to 15mm of play. The pedal had NO play at all. I adjusted it and it seemed to fix the problem! I'll update after I drive it some more...
I drove it around and then cracked open the slave cylinder bleeder - there was pressure! So that means the system was not de-pressurizing. I checked the FSM and it said to adjust the pedal to have 5 to 15mm of play. The pedal had NO play at all. I adjusted it and it seemed to fix the problem! I'll update after I drive it some more...
#9
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Hydraulic Clutch
Well, I changed the slave cylinder, and it was doing fine for a while, then started having the same slippage problems.
I drove it around and then cracked open the slave cylinder bleeder - there was pressure! So that means the system was not de-pressurizing. I checked the FSM and it said to adjust the pedal to have 5 to 15mm of play. The pedal had NO play at all. I adjusted it and it seemed to fix the problem! I'll update after I drive it some more...
I drove it around and then cracked open the slave cylinder bleeder - there was pressure! So that means the system was not de-pressurizing. I checked the FSM and it said to adjust the pedal to have 5 to 15mm of play. The pedal had NO play at all. I adjusted it and it seemed to fix the problem! I'll update after I drive it some more...
#10
Here's the update guys, the truck behaved itself for a while but now it acts up intermittently. Seems like if I pump the clutch a few times it will begin to grab better...
Also, the clutch does not start to grab at all until the clutch pedal is about 1/2 way up, and even when it was working it was still soft...
Any more ideas guys?
Also, the clutch does not start to grab at all until the clutch pedal is about 1/2 way up, and even when it was working it was still soft...
Any more ideas guys?
#11
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If you pump the clutch a few times and it grabs better, then it sounds like you've got air in your system. Check out the rubber hose near the slave cylinder for leaks.
Also, it's possible that either your MC or SC, or both, are not doing their job. If you have air in the system, it doesn't take long before the aforementioned break down due to poor lubrication. Did you bench bleed the MC?
One more thing is to look at your clutch pedal bracket to make sure there aren't any cracks which may limit the travel of the push rod in the MC.
Also, it's possible that either your MC or SC, or both, are not doing their job. If you have air in the system, it doesn't take long before the aforementioned break down due to poor lubrication. Did you bench bleed the MC?
One more thing is to look at your clutch pedal bracket to make sure there aren't any cracks which may limit the travel of the push rod in the MC.
#12
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Clutch Problem
Here's the update guys, the truck behaved itself for a while but now it acts up intermittently. Seems like if I pump the clutch a few times it will begin to grab better...
Also, the clutch does not start to grab at all until the clutch pedal is about 1/2 way up, and even when it was working it was still soft...
Any more ideas guys?
Also, the clutch does not start to grab at all until the clutch pedal is about 1/2 way up, and even when it was working it was still soft...
Any more ideas guys?
#13
Here's a new element guys - I just called a mechanic and told him my woes, and he said that my problem is probably that I replaced the MC with an Advance part... In his experience items like that from Advance or Autozone do not hold up. This would explain why I got a good 6 months out of it but that was it. Looser tolerances, cheaper materials, etc.
I will be replacing it sometime soon (and probably the slave cylinder too), getting my money back from Advance, and I will update.
I will be replacing it sometime soon (and probably the slave cylinder too), getting my money back from Advance, and I will update.
#15
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Clutch Master Cylinder
Here's a new element guys - I just called a mechanic and told him my woes, and he said that my problem is probably that I replaced the MC with an Advance part... In his experience items like that from Advance or Autozone do not hold up. This would explain why I got a good 6 months out of it but that was it. Looser tolerances, cheaper materials, etc.
I will be replacing it sometime soon (and probably the slave cylinder too), getting my money back from Advance, and I will update.
I will be replacing it sometime soon (and probably the slave cylinder too), getting my money back from Advance, and I will update.
#16
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get real toyota parts when it comes to hydraulics. apparently the cheapo rebuilts don't last at all. i used cheap rebuilts when i did my clutch and it's already giving me notchy shifting after only a few thousand km.
#17
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