hmmwv composite fan upgrade

[85-m1028]

has anyone upgraded to a 10 blade clock wise composite fan used on the A1 hmmwv?? if so does it bolt to the existing fan clutch or does it need the hmmwv clutch??

[Dieselboy]

The hummer fan won't bolt to a CK clutch, and a hummer clutch won't bolt to a regular CK water pump pulley.

Hummers have a 4 groove pulley with a wierd pressure plate style fan clutch that has a special mating with the pulley.

[85-m1028]

I have a hmmwv 6.2 take out with the hmmwv clutch and pulley, there is a device on the end that spins freely and has a small opening for some kind of hose???? does this activate the clutch?? sound like I would be stuck with the 87gpm hmmwv water pump if I went this route? what's different about it??

[Dieselboy]

I think that nipple hooks up to a coolant line, and then locks for clutch engagement.

You would be stuck with a clockwise rotation water pump. 87 gpm is factory, and peninsular has a 110 gpm pump - I've used the latter on my engine with good success.