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As much of my resource material is quite old, I unfortunately I don't have the phase diagrams for any V-type engines.  You should be able to get that information readily from the engine manufacturer.  It will tell you if the "5x component (firing frequency)" is a major or minor order.  You might try contacting them yourself, again you need the firing order which you didn't supply.

With regard to the phase diagrams see the paper at Torsional Vibration in The Diesel Engine.  The content is very old but go to page 55 and you'll see a table of the anticipated minor and major orders for a 8 cylinder 4-stroke diesel.

More modern information can be found at http://www.jmess.org/wp-conten...4/JMESSP13420093.pdf

I previously mentioned an elastomeric coupling.  Is one being used, and if so have you inspected it?  Typically, these couplings have some form of a rubber element.  The rubber elements tend to age over time and get hard hence driving the coupling stiffness upward.  This can change the torsional response of the system over time.

RM

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