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Riiiing

Mark1968

1/2 ton status
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Jun 25, 2010
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Location
SW Ohio
I have what sounds like a tiny bell ringing at very light throttle.
Is this detonation and if so what how do I get rid of it.
1979 350, timing set at either 8 or 10degrees.
 
What kind of air cleaner? Detonation sounds more like a garbage disposal with a rock in it
 
Stock air cleaner. I am wondering if it in the dist because at idle I can advance the timing slightly and hear it.
 
You sure it isn't the sound of air past the throttle blades?
 
Start poking around under the hood. It could very easily be something that's loose that is noticeable at certain rpm points due to vibration/harmonics.
 
It's the sound of an angel getting their wings.
 
Noises can be a PITA to locate. You might get a "mechanic's stethoscope"

http://www.harborfreight.com/mechanics-stethoscope-41966.html

or similar, going around the engine compartment putting the probe up to various parts of the motor. Note they are surprisingly sensitive, so don't plug the earpieces right in like they're your iPad earbuds or you WILL hurt yourself. Hold the earpieces outside the ears, first, until you get a feel for how FRIGGING LOUD they can get. This is the voice of experience.

The general idea is that if you put the probe up to the case of the alternator (being wary of the wiring :) ) and you hear the noise, then you may be hearing its bearings grind or the like.

If the probe picks up your tapping when placed against the heads -- don't burn yourself on the manifolds -- you've got top end noise (bad), or below the heads, bottom end trouble (really bad :( ) Obviously the motor makes "normal" noises so the trick is to local the "abnormal" one. (Youn Frankenstein ... "Abby Normal"...)

Make sense?

-- A
 
Have you run over a cat lately? Some of them wear bells on their collars, and it might be hung up under the truck........

Otherwise check your exhaust pipe hangers. Some of the aftermarket type are made of old belt type material, with a rivet and a washer.
When the belt breaks, the washer will ring at idle.
 
Have you run over a cat lately? Some of them wear bells on their collars, and it might be hung up under the truck........

Otherwise check your exhaust pipe hangers. Some of the aftermarket type are made of old belt type material, with a rivet and a washer.
When the belt breaks, the washer will ring at idle.
 

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