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Blow up the clutch!!!

Discussion in 'Intermediate CJ-5/6/7/8' started by johneyboy03, Jul 9, 2012.

  1. Jul 9, 2012
    johneyboy03

    johneyboy03 The green beast

    Quebec, Canada
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    I just want to share my weekend experience!!! I was riding off road on saturday and at the end of the day i wanted to go down a high slope on hard sand surface. Put the tranny on low (t18 a 6.32) with the t-case on low and start going down. My mistake is there i wanted to let the jeep go down by itself so i push the clutch pedal to the floor all the way down but i took too much speed and at the end of the slope i was going to much fast and with the centerforce the clutch blow out. Result no more clucht at all need to replace the whole thing. :cry:

    Conclusion: Never go down a slope with a t18 un first speed with you're feet holding the pedal clutch on the floor....jeep toss
     
  2. Jul 9, 2012
    timgr

    timgr Jeepin' Nerd 2020 Sponsor 2019 Sponsor

    Medford Mass USA
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    Yes. Seen that before. You spin the friction material right off of the disk.
     
  3. Jul 9, 2012
    '72CJ5

    '72CJ5 Member

    Modesto,...
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    Im not sure I understand correctly. So you went down a slope with the transmission in first gear BUT you had the clutch pedal pushed in and that caused your clutch to go out? Or am I missing something...

    EDIT: Or is it because with the clutch disengaged and not being held by the engine and while in first gear, the wheel speed will end up multiplying back through the drivetrain to the clutch and literally spin the material off of the disk. Is that what happens?
     
    Last edited: Jul 9, 2012
  4. Jul 9, 2012
    duffer

    duffer Rodent Power 2019 Sponsor

    Bozeman, MT
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    Think clutch rpm's FAR in excess of what would normally blow the engine. Something one should avoid and if you are still using the stock clutch, pieces could be coming through the floor. When a pressure plate does come apart, it is really impressive-but probably not something you want to see.
     
  5. Jul 9, 2012
    johneyboy03

    johneyboy03 The green beast

    Quebec, Canada
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    Exactly what happen on saturday....i can't tell at the moment if it's the clutch or the pressure plate, only thing i know i was still able the switch speed withou using the clutch and nothing pass tru the floor
     
  6. Jul 9, 2012
    '72CJ5

    '72CJ5 Member

    Modesto,...
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    Thats what I was saying about the clutch RPMs. If going down through the drive train reduces the RPMs down as much as it does, I can only imagine how many RPMs that clutch would be spinning with all the speed being fed back up through the drivetrain.
     
  7. Jul 9, 2012
    timgr

    timgr Jeepin' Nerd 2020 Sponsor 2019 Sponsor

    Medford Mass USA
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    Think 10000 RPM. The clutch disk blows up. It throws the lining right off of the disk.

    I've seen the end result - it's like stringy mineral wool.

    Gears in 1st, low range, downhill, clutch in. 20 mph is enough to blow up the clutch disk.
     
  8. Jul 9, 2012
    johneyboy03

    johneyboy03 The green beast

    Quebec, Canada
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    Hum i will take some picture for sure of the desaster between the engine and transmission. One thing is sure i won't ever go down a slope the way i did it this weekend!!!!
     
    Last edited: Jul 9, 2012
  9. Jul 9, 2012
    Mike S

    Mike S Sponsor

    Cameron Park Ca.
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    Exactly, the flywheel and pressure plate stay at idle RPM, but the clutch disk is spinning like a dervish on drugs. Centrifugal force literally throws the friction material off the metal center plate.

    Did this to my old Datsun pickup once, demonstrating how smoothly it could downshift.................
     
  10. Jul 9, 2012
    johneyboy03

    johneyboy03 The green beast

    Quebec, Canada
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    but the weird thing now is, if the friction material is going off the clutch why i was still able to still run the jeep, shift speed without using my clutch? If there is no more friction matérial how can it trac on the flywhell and the pressure plate?
     
  11. Jul 9, 2012
    zila

    zila I throw poop

    Rock Springs,...
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    Once you get moving it seems shifting is pretty much a none issue. I rarely use the clutch on my dirt bike when shifting. Just let off the gas and shift. I blew the clutch on my girlfriends Mustang years ago. drove a long ways home w/o a clutch..
     
  12. Jul 9, 2012
    johneyboy03

    johneyboy03 The green beast

    Quebec, Canada
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    it's not a big deaf if you don't have red light to cross.....was funny this week end, two jeep to escort me tru the stop and red light.
     
  13. Jul 10, 2012
    nickmil

    nickmil In mothballs.

    Happy Valley, OR
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    Typically the friction material bunches up between the flywheel and pressure plate and won't allow it to release. That's why the disc and transmission input shaft was still driven. Any worse and you'd have no drive to the transmission.

    Edit: should have said between disc and flywheel or disc and pressure plate.
     
    Last edited: Jul 11, 2012
  14. Jul 12, 2012
    johneyboy03

    johneyboy03 The green beast

    Quebec, Canada
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    Ok well changed the clutch last night picture to come tomorow or this week end. I can tell you that on the side of the pressure plate there is no more friction material and on the side of the flywheel it seem in perfect shape.
     
  15. Jul 12, 2012
    Howard Eisenhauer

    Howard Eisenhauer Super Moderator Staff Member

    Tantallon, Nova...
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    Having spent quite a bit of time driving in Quebec I'd say most people don't actually bother with escorts when cruising through stops & red lights :D

    H.
     
  16. Jul 12, 2012
    johneyboy03

    johneyboy03 The green beast

    Quebec, Canada
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    hum i can't tell where it come but when we have a stop and you don't stop you're car totaly we call it an "american stop" ...i've been driving in Moroco, Usa, Mexico, British Colombia and i can tell that there is weird driver whatever you're coming from!!!
     
  17. Jul 13, 2012
    DrDanteIII

    DrDanteIII Now with 95% more running jeep.

    Milford NJ 08848
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    I've always called it a California stop.
     
  18. Jul 13, 2012
    sterlclan

    sterlclan Member

    exploring the...
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    no cop....no stop.
     
  19. Jul 14, 2012
    givemethewillys

    givemethewillys Sponsor

    New Kent, VA
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    This is good to know, I never knew that coasting with the clutch "in" in low gear could be so bad!
     
  20. Jul 14, 2012
    Hawkes

    Hawkes Member

    Nova scotia
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    That makes 2 of us, never heard of it before but makes sense.
     

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