Should the fan be engaged even when cold?

[EShaw]

Guys,

The subject says it all... ... Should the fan be engaged even when you first start up? My instincts tell me NO... ... . But I defer to the sooth sayers on TDR.

Eric

 

[Tom G]

Don't know for sure if it's normal but mine does the same thing. Seems to take about 1-2 minutes before clutch fan fully disengages. I say fully because it's still somewhat engaged all the time to move air across the other stuff in front of our engines.



Read in some magazine/shop manual/book (can't remember which) that the viscous fluid in the clutch fan settles to the bottom of the clutch fan housing and takes a minute or two to get re-distributed when re-starting the engine.



Have a great day

Tom G.

 

[Ramboy]

I'm glad you brought this up. Mine runs all the time and I have been meaning to check my service manual to see if this is normal. Guess I will put this at the top of the to-do list.

 

[Tom G]

Now its hot instead of cold

I am glad someone has taken up the challenge to look this up in the books of love (shop manuals



Of course we haven't even discussed yet what happens after the truck gets warmed up and you are heading down an Arizona highway in July.



Well if you have never visited Lake Havasu City, AZ in July, August or September let me tell you; there is no reason to bring a stove to cook your breakfast. Common temps can be anywhere from 110-125 degrees. And at about 210 degrees on the beasts temperature gauge you change over from a Cummins Diesel to a Turbo Fan Engine. I am here to tell you that the clutch fan and the fan itself on the Cummins moves some serious quanities of air. It sounds like a gas turbine winding up when the fan engages.



Anyway, mine is working fine but just wondering what temperature the clutch fan is set to engage at when the engine gets-to-workin. Everyone know the OEM (orginal equipment manufacture) gauges are not very accurate.



Tom G.