F40 overheating

dcsey

New User
I've been putting a Ferguson F40 back together after it sat through the winter with a cooling system full of water. Replaced the radiator, water pump and thermostat and
used K&W Nanotech head and block sealer which I'd read about on these boards. The block sealer seems to have worked fine (no coolant in the oil pan, anyway) and it will
idle all day long and the temp gauge never breaks above 170-180. Once it's under a load, the temp gauge climbs pretty rapidly and the radiator overflow starts spitting
once it hits ~230. I can release the pressure at the radiator cap, give it a few minutes and then top off the radiator (takes about 1/2 gallon at this point) and it
will start back up at about 180, but will show the same symptoms after maybe 15 minutes at the most. I removed the thermstat, but that made no difference at all. I've
been told the head gasket might have blown between a cylinder and water jacket and the pressure in the cooling system comes from cylinder compression. Or perhaps the
block sealer is restricting flow through the cooling system. Just thought I'd solicit thoughts from the experts here. Thanks in advance.
 
where did you apply block sealant? water pump has a gasket as does t-stat. soundl like your radiator has blocked fins. the radiator isn't clogged with dust or mud is it?
 
you will know if head gasket is blown by running with cap off. you will see percolating in radiator but don't confuse this with normal agitation of coolant from flowing in from upper hose
 

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