Ford 9n overheating

Farmer Kevin · Mar 26, 2014

Hi I have a 9n with a new water pump,belt,hoses and
thermostat it over heats after very little use n is y I changed the
pump. Any ideas on as to y is still over heating would be I
appreciated. And yes the thermostat is put in the right way the
belt is tight and coolant it is up to level and not going down

Jimmyjack · Mar 26, 2014

Radiator or block could be partially plugged?

Bruce (VA) · Mar 26, 2014

Check out tip # 24 at the link.

But, sometimes you just have to bite the bullet & flush out the block & radiator. To do that, remove the t-stat from the top hose. Then, remove the bottom hose from the radiator & stick your garden hose in the radiator. Turn the water on (reverse flush) & the water will flow into the radiator, then the block & out of the disconnected lower hose. Let it run until the water is clear. Then, check the radiator flow. Stick the hose in the top of the radiator; the water should flow out of the bottom w/o backing up in the filler neck. It should flow at 19.5 gallons a minute. As a final flush, put a gallon of white vinegar & about 2 gallons of water in the radiator, run it to operating temp & then drain it again. Don’t forget to put the t-stat back in correctly!

Use 50/50 anti-freeze & distilled water as your coolant. The anti-freeze contains rust inhibitors, pump lubricant & raises the boiling point of the coolant.

If you do need to get the radiator re-cored, make sure you get the flat fin industrial core. Automotive style cores will clog up w/ debris very quickly.
75 Tips

Bob Harvey · Mar 26, 2014

As below, you should think about flushing EVERTHING. I got about 1/2 an ice cream bucket (4l) full of apcray out of my 45 2N block alone. HTH

Den N Ms · Mar 26, 2014

Kevin,I have seen the blocks on Ns be 1/2-3/4 full of rust,crud,and old stop leak.You can remove both hoses from the engine,remove the drain cock from the block.Then flush it out with a water hose turned on full alternating from upper to lower with a rag wrapped around the hose for a good fit.run a wire into the block drain hole to loosen crud. If it still has crud in the block find a 1/4" npt male garden hose coupling and hook the hose to the block to flush it out.Then flush the radiator out.Then run some vinegar in it and flush again.

souNdguy · Mar 27, 2014

deffinately flush block, then see how well the rad passes water from inlet to outlet.

lastly.. not running lean are you?

and have you done a leakdown and compression check?

Ford 9n overheating

Farmer Kevin

New User

Jimmyjack

Well-known Member

Bruce (VA)

Well-known Member

Bob Harvey

Well-known Member

Den N Ms

Well-known Member

souNdguy

Well-known Member

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