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post #1 of 9 Old Aug 8th, 2011, 12:52 am Thread Starter
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Question Noisy Clutch

2002 LT
Clutch is making a rattle noise when engaged. Pull in the lever and the rattle goes away.
This happens in any gear AND in neutral.

Is it gonna scatter the clutch and leave me stranded?
OR is it the throwout bearing?
I'm bummed out

2002 K1200LTC Ocean Blue
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post #2 of 9 Old Aug 8th, 2011, 8:42 am
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Cool Re: Noisy Clutch

Eric, this is a new one on me. Can't recall seeing these symptoms before on the LT, but hopefully someone else will chime in with a suggestion. If you don't get any ideas locally here you might want to post the symptoms on the main LT forum to reach a larger group of folks.

John

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post #3 of 9 Old Aug 8th, 2011, 8:32 pm Thread Starter
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Re: Noisy Clutch

I just went out and took a better listen to the thing. Sounds like a rough bearing. I'm hoping, if you can call it that, for throw out rather than transmission.
Still a bunch of work.

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post #4 of 9 Old Aug 8th, 2011, 8:42 pm
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Re: Noisy Clutch

Quote:
Originally Posted by Eric_R
I just went out and took a better listen to the thing. Sounds like a rough bearing. I'm hoping, if you can call it that, for throw out rather than transmission.
Still a bunch of work.
The "throwout" bearing is a very small, about 12 mm, ball thrust bearing in the end of the slave cylinder piston. Doubt you are hearing that, besides, that bearing is spinning anytime the engine is running. If that bearing gets tight enough, or seizes, the slave is ruined (which is what I think takes out many of the failed slaves).

I am trying to think of what else it could be, but so far, no good answer comes to mind. It could be the transmission input shaft bearing, or possibly the rear engine output shaft bearing, but not all that likely. It is possible that the spline drive to the clutch has worn, or something else in the clutch, like the rivets holding the clutch lining have loosened. All just guesses at this point.

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post #5 of 9 Old Aug 8th, 2011, 9:47 pm Thread Starter
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Re: Noisy Clutch

Quote:
Originally Posted by dshealey
The "throwout" bearing is a very small, about 12 mm, ball thrust bearing in the end of the slave cylinder piston. Doubt you are hearing that, besides, that bearing is spinning anytime the engine is running. If that bearing gets tight enough, or seizes, the slave is ruined (which is what I think takes out many of the failed slaves).

I am trying to think of what else it could be, but so far, no good answer comes to mind. It could be the transmission input shaft bearing, or possibly the rear engine output shaft bearing, but not all that likely. It is possible that the spline drive to the clutch has worn, or something else in the clutch, like the rivets holding the clutch lining have loosened. All just guesses at this point.
Yikes, when YOU aren't sure I really get worried.
Guess I'll take it over to a tech session and let the guys take a listen. Maybe I can sprinkle Marvel Mystery Oil on it, that will fix anything

Thanks for your time David.

2002 K1200LTC Ocean Blue
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post #6 of 9 Old Aug 8th, 2011, 10:51 pm
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Re: Noisy Clutch

Is it perhaps alternator rattle? Try turning on the high beam and applying the brakes to see if that changes the noise.


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post #7 of 9 Old Aug 9th, 2011, 9:34 am Thread Starter
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Re: Noisy Clutch

So, latest tests while riding.
60 mph, clutch engage=noise, clutch dis-engage=no noise.
I pulled in the clutch and hit the kill switch at 60mph. Silence!
Slowly engaged the clutch, noise back.
I noticed that I can feel the vibration of the noise, I had dismissed it as bad road surface/tires.

Not the alternator rattle, that stays constant when the clutch is engaged. Thanks for the thought Dean.
Not tires cuz' it happens while stopped in neutral.

I will take her to the tech session at Ernie's on Saturday for the assembled masters to ponder over.

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post #8 of 9 Old Sep 2nd, 2011, 12:59 am Thread Starter
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Re: Noisy Clutch

As it turned put the noise was the transmission input shaft bearing.
Ernie has the bike apart in his shop. I have all new bearings and seals and await his return to reassemble the bike.
Lots of fuzz on the drain plug.
Photos to come.

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post #9 of 9 Old Sep 2nd, 2011, 10:28 am
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Re: Noisy Clutch

Quote:
Originally Posted by Eric_R
As it turned put the noise was the transmission input shaft bearing.
Ernie has the bike apart in his shop. I have all new bearings and seals and await his return to reassemble the bike.
Lots of fuzz on the drain plug.
Photos to come.
That's good news! With all of the parts in we will be able to get your bike back together this week. I'll be home from Boise on Sunday night. Sorry you wern't here to join us, but it was a lousy party anyway...
Ok, I lied just to make you feel better.

Ernie A
Milwaukie, OR
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