47-55.1 Lincoln Cooling Fan

[mobileortho]

Originally Posted by leegreen

I'd look for a stuck thermostat or obstruction somewhere. A water pump that is failed so hard as to stop pumping would probably have other issues...like a seized pulley and a large puddle. It is possible the pump spit the impeller off the back, just not likely

That makes sense & is the easiest fix. I'll start with the thermostat this weekend. Thanks Lee!

[leegreen]

I think it said on the Holley site that the water neck could be clocked. It might be as simples as the actual thermostat vent hole being at the bottom so there is a bubble in the housing and is no water flow around the thermostat body to heat it up in time

[mobileortho]

Crossed the thermostat off the list, it works fine. Tested it this weekend.

[dsraven]

the LS engine coolant flows through the rad and butts against the closed thermostat (until it opens) at the engine coolant intake of the water pump then, when the engine heats up, coolant flows. you wouldn't see flow in the rad until this point. the old small block way was flow through the thermostat from the engine outlet side, not the intake side.
either way, no flow through rad until thermostat opens. flow through heater hose all the time.
check out this link for an in depth look at cooling system, steam lines etc. LS specific
http://www.billavista.com/tech/Artic...ble/index.html

[mr48chev]

That link is quite and education in cooling and especially in LS cooling.

[dsraven]

yup, it is a good read for somebody who is building and is unfamiliar with how the LS system works.
hopefully it will help somebody

[Hcb3200]

Pull the thermostat. out leave it out
Put the lower hose back on and stick a garden hose in the fill of radiator.
Take off the top fill hose and leave over top of radiator. (tie it off so does not fall into mechanicals)

Fire it up let it run and see how much flow your actually getting thru the system. it should hardly get up to operating temp with the constant flow of cold water in system.

That will tell you a lot. you can even measure gallons per minute in a five gallon bucket.

[mobileortho]

Originally Posted by Hcb3200

Pull the thermostat. out leave it out
Put the lower hose back on and stick a garden hose in the fill of radiator.
Take off the top fill hose and leave over top of radiator. (tie it off so does not fall into mechanicals)

Fire it up let it run and see how much flow your actually getting thru the system. it should hardly get up to operating temp with the constant flow of cold water in system.

That will tell you a lot. you can even measure gallons per minute in a five gallon bucket.

Great idea. I like the idea of trying small things first & checking them off before tackling the bigger stuff. I plan on running steam port vents on all four corners & moving the hose from the water neck housing on the pump to the upper radiator hose to see if that make a difference as well. Fingers crossed.