407 dampner problem

I just overhauled a 1256, dampner went out, although I didn't notice it wobbling, took the teeth off the cam timing gear. Put new cam, etc. in it, and am pretty happy with how it turned out. I also put a new dampner on, driving on the hub, not the weight. It was new from CIH.

At an idle, I can't quite tell if the dampner is running true. The fan belt isn't quite square, thanks to a non factory alt bracket. I don't know if the paint is wore off uneven or if I have a slight wobble. I can't feel a wobble when letting my fingers run over the back of the dampner while idling. I can't feel any vibration in the tractor. If I crack the throttle and give it 2-300 rpms it looks perfect. How can I tell if I have a wobble or an optical illusion? The CIH service man said as long as the index marks line up, I am fine. Is this so?

I will recap what I said at the Red Power site. I don't want to be a pain in the butt, but I want to know this topic. That is what makes these sites such a great service. There are people here who know these older tractors when you can't consistently find that at your dealer.

Thanks. Dan Hanrahan

scotty

Not to worry; lots of 'em look like they are "out of round". :>)

Allan

Just my 2¢. Harmonic distortion occurs at roughly 1500 rpm. The Harmonic balancer is designed to even this lengthwise distortion of the crankshaft out to an acceptable level.

If you don't feel any vibration at this speed range, I'd bet that the dampener is just fine.

And, believe me, if there is something wrong with that balancer, you'll know it. It will shake the hat off your head.

Allan