TR2/3/3A Cog v-belt causing noise.

[Lukens]

I just replaced my generator with an alternator. I kept my original wide belt pulley. Today I took a 150 mile drive and could hear a "whirring" sound coming directly from the alternator. Got home and took the belt off. The bearings sound and feel fine (spinning by hand). I used a cog belt (top and bottom cogs) and had the tension set properly. Could it be that I'm hearing the belt contacting the v groove in the pulley? If that's the case I can live with the sound.
Russ

 

[Geo Hahn]

Russ - I like to use a mechanics stethoscope to pinpoint strange sounds:

https://www.harborfreight.com/mechanics-stethoscope-69913.html

Though the same results can sometimes be had with a piece of hose or a long screwdriver. Just be careful around moving parts.

 

[TR3driver]

I'd be looking for where the rotor or the fan is just kissing something, under the load from the belt.

Or is this like the old Rolls Royce commercial with the loud clock?

 

[Lukens]

Or is this like the old Rolls Royce commercial with the loud clock?

I put the old solid v belt on and the noise went away. Apparently the cogs need a few miles to conform to the pulley.
And yes, it may be a case of the loud clock. Since I had the head reworked, the motor runs much smoother and quieter.

 

[CJD]

I'm worried about your mufflers. They are way to quiet if you can hear a belt whirring!

 

[Lukens]

I'm worried about your mufflers. They are way to quiet if you can hear a belt whirring!

Loud pipes save lives? BTDT
Now I like it quiet so I can talk to myself.

 

[tomshobby]

Now I like it quiet so I can talk to myself.

Might be a good thing but I tend to forget what I am talking about. :rolleye:

 

[martx-5]

That's not as bad as arguing with yourself.

 

[TR3driver]

That's not as bad as arguing with yourself.

And losing !!