jasonz44124 Posted December 28, 2010 Share Posted December 28, 2010 changed the fan clutch twice now with brand new from mack still locked up any ideas??? its a viscouse clutch on a 94 rd e7 350 mechanical is there a senser somewhere?? if so how does the clutch get a signal without a wire or airline?? got me puzzeled anyone heard of this both clutches were brand new also changed waterpump during first go around no prob yet, used special mack bolts too. thanks Jason Quote Link to comment Share on other sites More sharing options...
theakerstwo Posted December 28, 2010 Share Posted December 28, 2010 Sensor is in the front center of the clutch but it never locks the clutch 100% Quote glenn akers Link to comment Share on other sites More sharing options...
bobo Posted December 28, 2010 Share Posted December 28, 2010 Hey explain what you mean by locked up? That type of fan always has drag on it. It will appear tobe spinning when the engine is started, It has a bi-metal strip in the center where the heat sink is, there is no wire or air signal needed. Bobo Quote Link to comment Share on other sites More sharing options...
jasonz44124 Posted December 29, 2010 Author Share Posted December 29, 2010 its definetely locked up , mack dealer said this is common when its cold as hell out and u install a new one??? said to drive it a week and c if it frees up some, but this thing was squeeling the belts it was so stiff> tightened belts a bit and gonna drive for a while noisey as hell though and cant b good for the fuel economy never had this on any other truck, guy at mack said those viscouse cluthes are junk right out of the box so i might be swappin it again in a week thanks for any help Jason Quote Link to comment Share on other sites More sharing options...
bobo Posted December 29, 2010 Share Posted December 29, 2010 I never herd of that? And they are junk out of the box? All cars used Viscous fans until the electronic age came about, tried and true. I only know what I know! I could be wrong. Out of the 5 rb/rd's I've owned, I've only changed 1 Viscous fan. Bobo Quote Link to comment Share on other sites More sharing options...
rhasler Posted December 29, 2010 Share Posted December 29, 2010 I think there may be a couple of different viscous drive clutches. It seems like we had a similar problem on a CV chassis due to the incorrect part number being installed. The viscous fans are generally pretty much trouble free as Bobo said. Quote "Mebbe I'm too ugly and stupid to give up!" Link to comment Share on other sites More sharing options...
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