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#846 - Cummins Swap
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Fan pulley part #3943591. This unit is about 1" larger diameter than the stock one it replaced. It is the correct pilot and bolt circle size for the ACS fan. Installing this larger dia. fan will cause the fan belt to run against the upper water hose neck. My solution (as yet untested with significant run-time) was to route the fan belt on the outside of the tensioner. See pics following.


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