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Discussion Starter #1
is the harmonic balancer and the drive pulley for the fan/alt supposed to be one piece.....cause mines not. at first i thought the throwout bearing was making all that noise and vibration.
 

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There was a message posted yesterday about the same thing. Look back in the archives for more discussion however the answer is yes, they should not be detached from each other.

Brett
 

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Harmonic balancer is made of two metal(steel) pieces connected together by a hard rubber insert. They sometimes fail and one spis while the other screeches!
Sorry.
 

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There are a few varieties on the Balancer for the z car. The most common is the two pully two piece steel where the larger alt/fan are mounted on to the hub on rubber and the smaller accessory pulley is part of the hub. you can bolt additional pulleys onto the front of this unit. The better early 240z version mounts the alt/fan and accessory both same size as one unit and coupled to the hub via you guest it, rubber. It too can bolt on additional pulleys on the front of the hub. If you continually spin the pulley on the hub, look at aftermarket one piece CNC machined units. The cost goes up but the time spent changing the unit can be a real pain. Most parts available from junkyards are not going to be long for this life, I used to change them one or two a year.
 
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