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Old 08-25-2017, 10:49 AM
JeepSJ JeepSJ is offline
Jeep Freak
Join Date: Sep 2003
Location: Feeniks, Aridzona
Posts: 1,108
Default Check those harmonic dampers!!

The duallytruck had developed a bit of a higher-rpm vibration. Fan clutch was failing and I figured they were related as the fan had a lot of play. So get a new fan clutch and start the job. Crawl underneath to unbolt the fan shroud and I notice that the outer ring of the balancer is resting against the back of the lower pulley.

So I pull all the belts and unbolted the lower pulley and the outer ring slid right off.

I've heard about that happening but have never seen one actually come apart. Inner, outer and what is left of the rubber. Amazing how smooth that 454 is with a new balancer. I am just VERY glad that the pulley was a larger diameter than the ring. I could not imagine what a chunk of iron that size could have done had it come off on the freeway.

Now that I think about it, I should check the timing also...there is no telling how long it has been loose.
1987 Jeep Grand 6.5 in process...diamond block, 18:1's, other goodies...

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