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Just came across this while searching for something. Any updates?

Never mind... Who got "Blasted"?

Ray, your comparing apples to oranges. This situation is cut and dry, one driven accessory.

By engineering standards, it's a bad idea. There is no need for it either, the water pump has provision for adjustment.

Choose you words carefully, the engine drives everything! The accessory drive pulley drives the water pump.

Is the term "dogbone" supposed to be funny or disrespectful(I'm not getting that).

In your diagram, which end is driving it and which is the load? I don't see that determined in that diagram. It is correct when it represents the smaller pulley suppling the power and the larger one as the load. As posted(by you), the diagram is incomplete.

My first concern with the added tensioner where it is is, the bearing is under much more load than it needs to be on the tension side. Then there are a few other things.

Here's a nifty link with some good info. http://www.techtransfer.com/resources/wiki/entry/726/#Idler Pulleys Click on "idler pullys"

So, we agree on the direction of rotation. A belt transmits power by pulling(tension), not pushing. I corrected your pic with slight explaination. Does this make sence?

I determined the direction of rotation from your picture(posted below with explaination). I may be wrong as I can't see all the drive accecories but with some arrows and explaination maybe we can figure this out for sure. First off I looked at the fan blabe in your picture. If the fan and...

Personally, I prefer to maintain it as designed(same as other commercially used Cummins water pumps). That way, if I have a belt failure, I know all the fasteners are in good working order and the water pump surface is easily cleaned and lubed to reseal whenever needed. I was just pointing out...

Ideally a tensioner is installed on the "slack"side of a drive belt or chain. You have it on the "drive" side where tension always pulls it tight. This adds to the stress on your tensioner and mount.