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Thread: Clutch problem?

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    Clutch problem?

    Clutch any thoughts?
    Have a Y2K Mazda truck..Done me good for 11 years.
    Sometimes clutch pedal stays down and clutch stays engaged. Lift pedal with my foot and a pump or two and all is right. Local garage says need new clutch..Already replaced slave and master cylinders...maybe clutch springs or??.. Replacing clutch only about 7kbt so no big deal but not exactly sure if the real problem?
    Thoughts anyone??
    Been fixing my old cars for 50+ years never come across this problem...???

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    Quote Originally Posted by crepitas View Post
    Clutch any thoughts?
    Have a Y2K Mazda truck..Done me good for 11 years.
    Sometimes clutch pedal stays down and clutch stays engaged. Lift pedal with my foot and a pump or two and all is right. Local garage says need new clutch..Already replaced slave and master cylinders...maybe clutch springs or??.. Replacing clutch only about 7kbt so no big deal but not exactly sure if the real problem?
    Thoughts anyone??
    Been fixing my old cars for 50+ years never come across this problem...???
    Maybe need some oil on the pivot point of the clutch peddle.

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    Thailand Expat VocalNeal's Avatar
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    When they replaced the master cylinder did they replace the activation rod? there is a small plastic bushing in the eye that can wear.
    Or what Ratchaburi says

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    Have you tried to drive up a big hill? Best way to see if your clutch is slipping. Engine RPM will race ahead of KPH.

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    You say clutch stays engaged with the pedal down ? Or you mean stays disengaged and the pedal wont rise ?
    If the latter I would say the pressure plate springs are rooted.
    New clutch.

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    ^ Yep

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    Could be as simple as insufficient fluid in the master cylinder. Given that Somchai the shade palm mechanic has worked on it.

    Not easy but stick your head under the dash and see if the clutch pedal has an obvious hole where a return spring should be or there is a spring around the pivot that is broken.
    Better to think inside the pub, than outside the box?
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    ^You could be right. I had an old car once that had a spring going between the pedal and body. I found out the hard way that it was needed.

    Quote Originally Posted by crepitas View Post
    Lift pedal with my foot and a pump or two and all is right.
    ??

    Hmm.....I'm very tired tonight, and brain shutting down (I'm 3 hours ahead of you). But I seem to remember that occasionally the hydraulic hose going from the master to slave cylinder can partially collapse internally, so that when you put your foot down, the clutch disengages as usual. But when you take your foot off, the fluid does not return immediately because the nylon interior is pressing inwards. It literally has a kind of valving action.

    That would be amusing if I was correct.

    If it's not this, then it'll be something like the throwout mechanism getting stuck slightly = new clutch pressure and driven plates.
    As they are Thai : If you do that, make sure they replace the throwout bearing.

  9. #9
    A Cockless Wonder
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    Some clutches have auto-adjusting cables but the auto-adjusting mechanism can be prone to go out of kilter causing the clutch to behave oddly.

    I had a VW Polo that did that.

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    Thanks all.
    Will look at the nylon bush on op rod on slave.certainly was not replaced. Remember them frickin around with it a lot..? There were no probs for about 3 months after new master and slave ..just now started again though not all the time..something is sticking....
    Will check out pedal return .
    Will check out fluid level return.
    If not that then maybe will get a new clutch for the springs...though it is not slipping ...it stays engaged.
    Weird....hate to get a heart transplant for indigestion

    thx again

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    Quote Originally Posted by Latindancer
    It literally has a kind of valving action.

    That would be amusing if I was correct.
    No, it wouldn't.

    Does that vehicle have a clutch cable ? If so, that could be the issue, not the clutch plates.

  12. #12
    Excommunicated baldrick's Avatar
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    for your crutch problem I would suggest baby powder

    if the rash is still a problem you could try cornflour , or turn to a range of creams

    hope that helps

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    BTW, a piece of crud in the hydraulic line somewhere will valve it ( seriously ! ) just as much as a collapsed nylon inner as I described above.

    This is consistent with the master and slave hydraulic cylinders being replaced a while back.....particularly if they were only re-kitted with new seals, rather than the complete units replaced with entirely new ones.

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    Quote Originally Posted by crepitas View Post
    Clutch any thoughts?
    Have a Y2K Mazda truck..Done me good for 11 years.
    Sometimes clutch pedal stays down and clutch stays engaged. Lift pedal with my foot and a pump or two and all is right. Local garage says need new clutch..Already replaced slave and master cylinders...maybe clutch springs or??.. Replacing clutch only about 7kbt so no big deal but not exactly sure if the real problem?
    Thoughts anyone??
    Been fixing my old cars for 50+ years never come across this problem...???
    Kinda sounds like they didn't bleed all the air out of the lines when they replaced the slave and master cylinder. Or you got a bad slave or master.(happens with rebuilt parts)
    Or it could be the throw out bearing sticking.
    How long ago was the slave and master replaced?
    Go with the local guys advice they generally know how to keep these old trucks hammering away down the road.

    Loose springs on the disc you will noticed a chattering. If the disc is getting thin the release will happen near the top of the pedal. Noise when you push the pedal is the throw-up bearing about to throw-up.
    Last edited by Mr Earl; 06-04-2016 at 03:24 PM.

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    Quote Originally Posted by Ratchaburi View Post
    Quote Originally Posted by crepitas View Post
    Clutch any thoughts?
    Have a Y2K Mazda truck..Done me good for 11 years.
    Sometimes clutch pedal stays down and clutch stays engaged. Lift pedal with my foot and a pump or two and all is right. Local garage says need new clutch..Already replaced slave and master cylinders...maybe clutch springs or??.. Replacing clutch only about 7kbt so no big deal but not exactly sure if the real problem?
    Thoughts anyone??
    Been fixing my old cars for 50+ years never come across this problem...???
    Maybe need some oil on the pivot point of the clutch peddle.
    I will put this out there again as I have a old Nissan fork lift it will do the same,not all the time.
    This has happened 10 times over 3 year.
    A spray of WD40 will fix for now but will come back agter the wet seson

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    Quote Originally Posted by bsnub View Post
    Have you tried to drive up a big hill? Best way to see if your clutch is slipping. Engine RPM will race ahead of KPH.
    5th gear and the hand brake !

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    Quote Originally Posted by Latindancer View Post
    ^You could be right. I had an old car once that had a spring going between the pedal and body. I found out the hard way that it was needed.

    Quote Originally Posted by crepitas View Post
    Lift pedal with my foot and a pump or two and all is right.
    ??

    Hmm.....I'm very tired tonight, and brain shutting down (I'm 3 hours ahead of you). But I seem to remember that occasionally the hydraulic hose going from the master to slave cylinder can partially collapse internally, so that when you put your foot down, the clutch disengages as usual. But when you take your foot off, the fluid does not return immediately because the nylon interior is pressing inwards. It literally has a kind of valving action.

    That would be amusing if I was correct.

    If it's not this, then it'll be something like the throwout mechanism getting stuck slightly = new clutch pressure and driven plates.
    As they are Thai : If you do that, make sure they replace the throwout bearing.

    You old Valver you
    will not put up wiv the "Nanny state" so don't push it on me.

  18. #18
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    well well well..seems a judicious amount of spraying WD40 equivalent on every possible accessible clutch moving part has solved the problem at least temporarily.
    Thanks all...

  19. #19
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    Great !

    Next time it occurs on a regular basis, squirt it on one junction at a time in order to narrow it down. Then put a dab of moly grease on that joint.

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