Thanks to all for your input
Something to consider The water pump bearing is the weak link on these motors Does you drive system include the water pump? I would guess not. American diesel could give you your answer
Yes the water pump is on a separate pulley v-belt system with a smaller alternator. I agree the water pump bearing is the weak link in the system.
But like on some serpentine belts there is a back-side idler/tensioner which gives a belt more wrap as much as 240º.
of a idler has been a thought, seems that they cause the v-belts to wear faster. What are your opinions on this.
The engine pulley (it bolts onto the original Lehman
pulley) in question has 3 grooves. I used Gord's link for the calculator (thanks for that Gord just what the doc ordered). My first thought was to have the second alt and the compressor on the same circuit with a unused 3rd groove. The alt creates the belt adjustment. It looks like the best that I can do is 130 degrees the calculator calls for 165, I would have to install a idler.
The other options would be to run the alt and the compressor on there own separate circuits. The alt with two 1/2" belts and the compressor on the single
. The problem would maybe be that the compressor may require 2 belts. The other option is to turn up a 4 groove pulley, placing both loads in opposition. What do you think