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06 4300 heating problem

bigg

bigg

Active Member
Joined
Sep 27, 2011
Messages
34
Location
north carolina
Occupation
wrench turner
2006 international 4300 DT466 tree trimming boom truck. Truck runs hot when you're driving over 50mph. Will idle on the job all day long and not get over 200° if you slow down to 40 miles per hour or less temperature drops back to the 200°range. It has new thermostat new radiator hoses new water pump flush has been run through the engine twice and the external radiator itself has been cleaned. Any ideas possibly bad radiator?
 
mekanik

mekanik

Senior Member
Joined
Aug 20, 2015
Messages
957
Location
Canada's Northwest
I used to look after a fleet of Internationals with DT466's in them. The viscous fan hub contains about
2 tablespoons full of a thick silicone liquid. Over time the liquid disappears and the fan slows down
and the engine starts to run hot under load. I would strongly suspect you need to replace the fan hub.
 
bigg

bigg

Active Member
Joined
Sep 27, 2011
Messages
34
Location
north carolina
Occupation
wrench turner
mekanik said:
I used to look after a fleet of Internationals with DT466's in them. The viscous fan hub contains about
2 tablespoons full of a thick silicone liquid. Over time the liquid disappears and the fan slows down
and the engine starts to run hot under load. I would strongly suspect you need to replace the fan hub.
Click to expand...
The fan is really hard to turn with engine off an seems to be pulling lots of air but at 55/60 mph hard to tell. Think I'll try a fan clutch before I confirm the radiator.
 
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