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Originally Posted by willrev
Why couldn't I just remove the one on my car from the crankshaft via the center bolt and bolt the other one on there exactly as the old one was? Because if you are balancing the counterweight off the crankshaft - then the one off the old 1982 300sd parts car should be balanced and just go right onto mine.
Let me know what you think. I'm sure someone has an answer to this.
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The purpose of the balancing process that you read in the FSM is to match a new balancer to the original one. This is done by mounting the new balancer 180 degrees out of phase from the original, then removing metal from the new balancer until the two balance as mounted. That essentially "copies" the original. The original balancer is not in balance with itself. So you cannot just bolt on the junk yard balancer. However, it is possible that the junk yard balancer could be matched to the original, depending on the location and degree to which metal was removed from the donor part. But that is probably not the easier option.