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Discussion Starter #1
Just purchased a 2440. Everything looked good, no leaks, smoke or serious obvious problems except for broken differential lock pedal which I would like to address later. Brought it home and drove it around for a few minutes. Decided to brush hog a small area and it worked fine for a little over an hour. Then water boiled out the radiator fill. Shut down to idle and moved short distance to check further. Got the radiator cap off and slowly poured in about a gallon of water. No more steam, so I shut it down. After about an hour, started it back up and it boiled over in a few minutes at idle. Added a little more water and let it idle a few more minutes then shut it down for further checks. Removed top hose to check thermostat and there was not one installed. Next day checked water pump by removing small bypass hose and started tractor. Water forcefully shot out small hose. Removed radiator and discovered significant area with damaged fins and tubes, about the size of my hand. Doubtful water could have flowed through the tubes or air through the fins. Surprised it did not leak, perhaps someone had added stop-leak. My son is pulling water pump today to inspect impeller. Is there a way to make sure coolant can flow through the entire block and head before we go any further? Thanks in advance for your help.
 

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number one thing I'd do is replace that radiator, you're probably correct that it's barely flowing cooler through the cores because of stop-leak, corrosion, or God knows what. Second thing I'd do is a total drain, flush and refill with new coolant. If the water pump looks good, I'd put it all back together and see what happens.

Also, does the engine oil look clean? No contamination? There's no steam coming out the exhaust?
 
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Haven't drained the oil yet...looked OK on the dipstick..no apparent sign of water. No steam out of the exhaust, just the radiator cap. Also did not notice any foaming/bubbles in coolant...actually couldn't see much, if any, movement in the coolant itself. Difficult to see due to the obstruction (not sure what it is) just below the radiator filler neck. Intent was to drain and refill with new fluids before we got down to any serious usage in a few days. Looking now for new radiator, probably not worth trying to have the old one repaired since it would probably require new core anyway.
 

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Discussion Starter #4
Installing new radiator revealed probable cause of radiator damage. Broken welds on fuel tank attachment allows tank to push oil reservoir and air cleaner back against radiator. Bracket on R/H side of fuel tank that fastens to tank external rib is broken loose from front plate and R/H side weld of air cleaner mounting bracket is broken loose from fuel tank. Both of those breaks allow the fuel tank to move quite a bit and push the top rod connecting the tank to the radiator, forcing the radiator rearward into the fan. And there isn't much clearance between the fan and radiator. Looks like a job for the welder. Tech Manual says it can be done safely after draining and purging tank as long as tank is filled with water. Sounds reasonable. I guess we will find out. Anybody have any experience doing this?
 

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Discussion Starter #5
Overheating

Got the new radiator, hoses, coolant, and thermostat installed. Welding on the fuel tank bracket seems to be OK. Everything buttoned up and ready to do some work today.
 

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Overheating No More...

Brushhogging for a while today.. A little while after starting, the temp guage rose sharply then dropped back to normal range...suspect it was just the engine reaching temp to open the thermostat...stayed in normal range for a few hours, so looks like the overheat problem is solved.
 

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Problem solved but another appeard.

Solved our overheating problem with the replacement of the radiator and temp sending unit but the filler neck on the new radiator is about 1/2 inch shorter than the old one and the original radiator cap presses on the hood. The hole in the hood is not centered over the neck ... don't remember that being a problem before the radiator replacement....May have to enlarge the hole in the hood if we can't shift the hood a little to allow a smaller cap to be installed.
 
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