Yeah, you need thin wrenches.
Ford Dealers and Auto Parts Stores sell the set for the Ford 4.9L Fan Clutch,
I used 430 Channel Lok Pliers and a pipe wrench, I think
or two pair of 430 channel lok pliers (aka Channel Lock Pliers) to remove my 87
4.9L Fan Clutch.
My largest open-end wrench is 1-1/4" and that was not near wide enough being 1-1/4" is approximately 30 to 31mm.
If you can borrow a 1-1/2" or 1-7/16" open-end wrench from someone, well that just might fit?
Remember it has Right-Hand "Standard" Threads or in other words,
the fan clutch nut will turn Counter-Clockwise to REMOVE it.
Once you break the nut loose, it will unscrew easily counter-clockwise,
it's heavy and will fall to the ground if you are not careful.
Hope this helps!
Last edited by 1987 F-150 XLT 4x4; 09-26-2010 at 03:46 PM.
Reason: added a number