Re: harmonic balancer questions

Posted by Allan in NE on July 28, 2004 at 06:33:57 from (148.63.132.164):

In Reply to: harmonic balancer questions posted by Dan on July 28, 2004 at 06:06:37:

Mornin' Dan,

How goes the struggle? :>)

The harmonic dampener "absorbs" the (harmonic) torsional vibration of that crankshaft, which normally will start happening at about 1000 to 1500 rpm crankshaft speed; this happens on all engines.

At this speed, the crank is actually trying to 'warp' along its lengthwise axis and is trying to make the ends of the crank rotate in a larger "arc" instead of staying true in a straight line.

A bad dampener can show up in one of two ways and usually involves the rubber tearing loose from either the hub or the weight: Sometimes it will tear loose & ‘slip’ around the rotational axis and the timing marks are not where they should be. Or, at other times, the engine will vibrate when it reaches this 1000 to 1500 rpm range. It is kinda like a rattlesnake, once you are accustomed to it, you never forget it.

Did you hurt the dampener by putting it on cold? Nope, not as long as you were working on the "hub" portion of the unit and not the outer weight. Beating or pressing on the outer weight could cause it to tear all over again.

Hope this helps,

Allan

Follow Ups:

• Re: Re: harmonic balancer questions Dan 10:08:39 07/28/04 (2)
  • Re: Re: Re: harmonic balancer questions Allan in NE 11:46:16 07/28/04 (0)
  • Re: Re: Re: harmonic balancer questions Bob 10:28:53 07/28/04 (0)

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