I've been having trouble keeping my AMC 360 cool on the trail. It does fine on the road, staying around 190-195 with a 185 t-stat. But when I hit the trail it runs around 215 to 225. I'm currently running a mechanical fan (no clutch) and no shroud. I plan on getting a fan shroud, but have also been thinking about adding a pusher fan. Do they really help, or a waste of money? What have yall been using for a pusher setup?
Check your radiator 1st, like has been mentioned above.
The pusher fan will help, your clutch fan speed is tied the engine RPM. At low RPM(I.E. on the trail) the fan spins at a lower RPM. An electric fan spins at speed regardless of engine RPM.
However, unless you are doing something off the charts strenuous-or your 360 is making massive HP, I think this overheating is a product of either old fluid, a clogged radiator, or a damaged fan clutch. Did you put in a new radiator when you did the engine swap?
Another thought, that may or may not apply to the 360 is water pump rotation(those with 360 experience please advise to if this is even a possibility). I know on the straight 6's there was a water pump that everything on it was the same except the rotation...If buying refurbs especially, one needs to be very sure to double check the impeller for proper rotation-in case the store had mistakenly swapped them.
The impeller could also be worn out if a water pump has not been installed in a while. At higher RPM there is enough to move enough, but at lower RPM it could be lacking.
Will be ordering a shroud very soon. Does anyone know if whether or not I have a fan clutch make a difference on the shroud? I'm sure the clutch would make the fan closer to the radiator, but don't know if that would matter.
Would adding a clutch really help? Unless there is something in the clutch to make the fan spin faster, its not going to move any more air and just be another part to wear out.
Radiator was replaced 6 or 7 years ago and water pump is about 4yrs old. As soon as I get off the trail and start moving even 25-30mph it cools down almost immediately. This is at the same or lower rpm than on the trail. That's why I was thinking its an air flow problem.
You said you have a fixed fan, I need to know exactly what fixed fan you have. Stock or aftermarket? It does make a difference.
Also, if the engine is idleing in netural, do the temps run up over 200/215?
1957 WILLYS pickup,
1973 J 4000,
1978 CJ7 DD.
1979 CJ7 360, TH400/Quadratrac.
1980 CJ5 trail Jeep.
1989 YJ the CJ to YJ.