Gen 4 454 harmonic balancer screaming?

supercobra

Cadet
Joined
Jul 11, 2026
Messages
26
Bought this Baja force 250 with mercruiser 454 in it and replaced all gaskets .I also bought a parts engine to get parts and bolts from.Now after installing the original balancer it starts whining like a bearing is going out on a accessory pump.I then tried the parts motor balancer and it does the same thing.I took it off finally and it doesn't make no noise at all.WTF!! IS going on?It didn't do it before,but I did replace the timing chain cover seal for the balancer.Can that be it?Both balancer measure the same or real close.I even pulled it out a few thousands or millimeters.There is a line wore on the shaft of the balancer on the outside where the seal of timing chain cover is.Could this be it?The sound is unbearable.
 

alldodge

Moderator
Staff member
Joined
Mar 8, 2009
Messages
44,447
Don't see a balancer making any noise because "nothing" on it will move unless it's damaged and than the ring is going to go flying off. It's not flying off so it's something else like the ALT, water pump, idler or something else spinning
 
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