allen head or socket
 

need to replace fan clutch on 86 300sdl. did a search and still unclear as to the type of fastener holding clutch assembly to pulley. is it an allen head? or do i use a socket? anyone remember the size? thank you.

i continued the search
 

" I've not had any problem removing the 8mm allen head bolt securing the clutch to pulley using just a plain 'ol allen key. Some folks have reported using a cheater pipe on an allen key to generate enough force to break the bolt free." this sound correct?

allen head
 

I shortened the Allen about 1/2" to allow easier access to the fastener and used a 8mm. socket on the end of a couple of 1/4" extension pieces to engage the allen wrench and provide access and leverage.

Take a look at Baum Tools they show all sorts of tools relating to this area, perhaps one of them will give you your answer?

Kevin