vibration damper or harmonic balancer

[DThibault]

Has anyone had a vibration damper go bad and if so how did it act and how does one tell if it is bad? Thanks

 

[Shadrach]

If the rubber ring that separates the inner and outer parts of the damper starts to bulge out or fall apart it's time for a new one. A bad oil leak is one way to wreck the rubber part. Revving part the intended rpm limit will eventually cause problems also. Shadrach

 

[Greenleaf]

For some reason the industrial engines in the school bus application leak there. I have had to replace many a crank seal and balancer. The rubber oozes out. It normally is a very small buldge looking alot like a 1/8" bead of black silicone.



They also have a timing mark. One on the inner and one on the outter ring. They must be pretty much in perfect alignment.

 

[JLEONARD]

I know of more than one Perkins T6. 354 owners who have broken their crankshaft because of a bad harmonic balancer.



But no Cummins owners.