SoCal Jet Boats

Tech Talk => Engine Mechanical / Electrical => Topic started by: mkatena on May 20, 2018, 02:34:57 PM

Title: Harmonic balancer
Post by: mkatena on May 20, 2018, 02:34:57 PM

Question for you guys about the harmonic balancer on a BBC 454. How do you match one to your flywheel? The reason I ask is that I changed mine out (as it was bad) and purchased one from AutoZone. I just purchased the one for my motor and it looked the same as my old one. The issue I am having is I have a vibration once accelerating and on plane. Nothing at idle. The vibration is continuous. I’m not sure what flex plate I have as I did not build the motor. If they do not match could it cause a continuous vibration?


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Title: Re: Harmonic balancer
Post by: aquaholic72 on May 20, 2018, 02:48:06 PM

Did it look the same on the backside where the counterweight would be??  Timing cover side?

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Title: Re: Harmonic balancer
Post by: mkatena on May 20, 2018, 03:03:23 PM

It had the same drill holes on on front side facing away from motor. I do not recall a counterweight on the timing cover side.


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Title: Re: Harmonic balancer
Post by: el mojado on June 01, 2018, 07:34:41 PM

If it had a weight, new one must also have a weight. If it had no weight, new one must not have a weight. The holes will be there regardless.  The holes are where the weight is mounted. I just went through this.

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