Horton clutch fan

Does it screech when the fan engages or all the time? Could be just belt slip when it fully engages,lot of torque there from a dead stop.

 

Still sure it isn't the fan belts or something else? If it's definitely coming from the Horton it's time for a rebuild before disaster strikes.

 

Belt tensioner pulley?

 

Well I had an ISX that the belts would squeal most of the time and turned out that the pulley wasn't running true, just enough to make'em squeal.

 

I've had fan belts make a screeching noise before, they weren't that old. You can get spray cans of belt-grip from industrial supplies. Even WD40 would work just to see if that's your problem. If it's Horton bearing noise, the pitch (noise) should change when you engage/ disengage the fan clutch.

 

That's how it should work. Maybe you just never payed it much attention.

 

If it is a serpentine belt check and see if the groves in all the pulley's are free of dirt. Take a screwdriver or wire brush and clean the groves out. Alot of people will install a new belt and don't check to see if the pulley groves are clean or worn. It doesn't take much to get a new belt to slip if this is the case.also check the tension of the tension pulleys. If the springs are weak the belt will slip.