Ford 8N dumping coolant through radiator cap after shutdown

porchhound · Jul 30, 2015

This is a 1948 8N and it has coolant overflow from radiator cap after I shut it off from mowing. No temp guage so I don't know if it is overheating although i don't know any other reason. It also leaks from the hose connection shown in this photo. I have tightened this hose clamp now but why is it only leaking from cap at shutdown...fan no longer running?

ZANE · Jul 30, 2015

Probably too much coolant in radiator. The coolant level should be a couple of inches below the filler cap when cold. Water / coolant expands when
hot.

Zane

steve19438 · Jul 30, 2015

a meat thermometer can help determine water temp.

porchhound · Jul 30, 2015

Wouldn't I have to wait for it to cool down to pull radiator cap and check temp...or are you suggesting checking it with cap off during warm up?

porchhound · Jul 30, 2015

When I pulled the hoses off I didn't find a thermostat....just a really big spring in bottom hose (to keep it from collapsing?).

steve19438 · Jul 30, 2015

if its not over heated you should be able to SLOIWLY loosen cap. either way take it slow and easy and wear gloves or put a rag around the rad. cap.

old · Jul 30, 2015

Non pressurized cooling system so little if any problems removing the cap but you still want to use a rag and do so slowly just in case.

souNdguy · Jul 30, 2015

it is a pressurized cooling system.

early Big tank N's were non pressure.

That N should be something like 4 - 7 psi

Roger in Iowa · Jul 30, 2015

It is always a good idea to let engine idle for a few minutes before shutting off.

steve19438 · Jul 31, 2015

any chance the rad. could be clogged with grass?

porchhound · Jul 31, 2015

(quoted from post at 08:33:28 07/31/15) any chance the rad. could be clogged with grass?

Steve I checked it when I removed the hose to look for a thermostat and it looked clean...both sides. Thanks for reminding me though...easy to overlook.

Ford 8N dumping coolant through radiator cap after shutdown

porchhound

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ZANE

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steve19438

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porchhound

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porchhound

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old

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Roger in Iowa

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