A New Noise - E-e-e-e-e

Mike Rocket J. Squirrel Elliot · 2003-12-06T17:06:08+00:00

Yesterday, my lovely assistant Inge and I removed the fossilized remains of an air conditioner from the underside of the 71 hippie bus. It was just limpeted to the bottom midway between the front and rear wheels by four bolts, and had a few cut rubber hoses and other assorted disconnected bits. The four bolts that held the thing to the frame must have taken 15 minutes each to remove, even with PB Blaster they were reluctant. We held the thing against the bottom with jacks then lowered it down after everything was clear. Did a tidy job.Anyhoo, the bottom is much cleaner. But I have an exciting new noise to wonder about: when I engage the clutch, I hear a whining sound -- and it's not Inge feeling neglected. That's what -- the "throw out bearing" or something?What could have caused this? I know the sound was not there before we removed the A/C unit. I don't think that removing the A/C unit would have caused an otherwise inaudible noise to be louder. So the noise appears to be new. My options appear to be: A. Removing the A/C unit jiggered something I can't even begin to figure out because we were careful and nothing creepy happened during the removal, or it's a coincidence and the sound indicates something dire is about to happen in the clutch area.

Dec 06, 2003 24 Replies

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MUADIBÂ® 22 years ago

Hey Suirrel.................You have a pretty good knack for figuring this tuff out.

I figure , when you took the Core out from under the bus, you changed the resonant frequency of the mounting points thus giving more audible vibration. The vibration would have been dampened by the overall surface area of the hanging piece to a frequency much lower and making it much less audible to the human ear.

Makes plety of sense to me...................LOL

This all comes together pretty quick if you have done any vibration hunting after adding audio systems to cars, and having new exhaust put on, and stuff like that........................

Glad you found what causes the noise.............now how ya gonna fix it????

Keep us posted.

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Mike Rocket J. Squirrel Elliot 22 years ago

Will do. I'll need to do some more probing and poking at the area.

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Scott H 22 years ago

"Mike Rocket J. Squirrel Elliott" wrote

Sounds good ... ... and when you're done with Inga, you should check out the bus too. :-)

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Ilambert 22 years ago

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Mike Rocket J. Squirrel Elliot 22 years ago

Thank you. I'm an engineer, tho' electrical. Engineers have the conceit that we can figure anything out if we study it long enough. So do medical doctors, according to mine. I never forget that doctors have 0% success rate. All their patients die. My chances of figuring out something like this is higher than that of someone who does not even know how a faucet works, but it's far from 100%

The more I think about it, the more I am convinced that the A/C core was mooshed up against the clutch cable tube, and thus damped out the noise. Which makes the solution simple: re-install the core.

OT: Every time I go to write "clutch cable" I start writing "clutch cargo". Too many cartoons when I was a kid.

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