Question about destroying clutch plate WITH CLUTCH PEDAL DEPRESSED
I read an article online that a guy described blowing up his clutch in an unusual way. He claimed that his clutch blew up while he had pedal fully depressed. He was coasting down a hill in first gear with the clutch fully depressed at about 30 miles per hour when his clutch basically blew up. He said his clutch was rated for up to 6000 rpm but due to his speed and having the shifter in first gear (despite having the clutch fully depressed) that his clutch exceeded 6000 rpm and failed catastrophic, despite having the clutch completely disengaged
I don't understand the finer points about the clutch but I always thought as long as you kept the clutch fully depressed that you were OK, no matter what gear you were in or what speed of travel.
Is this true and under what particular circumstances can this happen?
BTW, the guy was driving a re-geared CJ but said it could happen to a stock Jeep.
Interesting...what exactly blew? Pressure plate, clutch disk, flywheel, throw out bearing, pilot bearing? The clutch disk is about the only thing that could have come apart since it is splined to the tranny input shaft and him in first going 30mph it would be spinning between the flywheel and pressure plate at a pretty good click and the material riveted to the disk could have let go.
The friction material WILL come off at a high enough RPM. I've seen it happen with a missed downshift happen with a missed downshift.
We did a Cavalier who's driver was known for not having any grass grow under his tires. Tech brought me the clutch plate...not a trace of friction material on it, but all the rivets were still in the holes, jingling like a tambourine...lol
Somebody that knows diff/transfercase/trans ratios should do the math and see just how easy it would be to overspin a clutch disk by coasting in gear like that.
Not sure WHY someone would be coasting at 30mph with the trans in 1st....good rule of thumb....don't do it.
Jerry - I respect your knowledge without question most in not all of the time, but I think you are wrong on this one. The pressure plate is bolted to the flywheel and therefore turns with the flywheel and engine. The clutch is "floating" between the flywheel and the pressure plate and riding on the transmission input shaft. I think the clutch disk will turn at the same speed as the transmission input shaft.
IE, when you are sitting still, in gear with the clutch depressed, the clutch is not turning even though the motor is idling at 800 rpm. I'm not even going to try to do the math on what the input shaft would be turning at 30 mph in 1st gear, but no doubt it was yelling for help. Not a smart move.
I think mine would hit about 5,000 rpms at around 15 mph tops.
2007 Patriot Limited
2006 Unlimited Rubicon
2000 TJ Sport
My previous Jeeps
1992 Wrangler S (Ole Yeller)
1985 Cherokee Pioneer
1989 Cherokee Laredo
1995 Cherokee Country
1996 Cherokee Country
1996 Grand Cherokee Laredo
Yeah that's wild,likewise I dont understand how that could happen if the clutch was disengaged.On the otherhand if he was coasting down hill at that rate in 1st gear while engaged.........hmmmmmm guess he got what he was asking for
It can happen! I had a clutch disc in my 2WD S10 explode on me when I went back into gear (1st) out of neutral too soon while coasting to the end of an interstate off ramp when I was in college. DOH! The friction material literally grenaded. I was one of those "in theory it could happen, but yeah right" know it all punk kids. It was only a two month old clutch, all be it not the best quality (AutoZone). One of those lessons I had to teach myslef the hard way...
Be very careful with the wife mod. Uninstallation can be extremely expensive. Wife mods have been known to take the Jeep and all other mods during the uninstall process. Also, make sure you service your wife mod properly as often as humanly possible. Wife mods not properly serviced may malfunction or uninstall themselves at any time.