Posted by Bruce in chilly b.c. [162.158.59.37] on Saturday, December 09, 2017 at 15:12:59 :
In Reply to: Re: Gain two inches on the front of your Cummins posted by Paul(in NY) [162.158.63.139] on Saturday, December 09, 2017 at 13:33:36 :
The solution to getting enough room for a shroud and mount the electric fan away from the radiator was to build a new mount to replace the old mechanical unit.
The solution was quite simple.
(1) I traced the old fan mount base on to a block of one inch thick aluminum
(2) I purchased a late 2000 Cummins idler pulley, comes with a bearing and bolt and a spacer
(3) I marked the pulley centre of the old mount on to the block of aluminum as well as the outside radius of the old pulley
(4) the new pulley is smaller, it needs to be moved out 45 degrees from the old centre until it is about 1/4" away from the old radius, at this point a new centre hole for the pulley can be marked and tapped. By doing this it is possible to use the old belt and the pulleys have optimal belt contact.
(5) to set the correct depth for the pulley you set the new unit and the old side by side on a flat surface. The new pulley spacer needs to be machined down.
quite simple really, a block of 1" aluminum, some math, trim a spacer, drill a few holes and you are ready to go.
The nice thing about this is if there is a bearing failure the replacement pulley will be a stock Cummins part. By going this route I now have room for a 1 3/4 shroud.