Loose radiator cap on 8n

Bullseye · Mar 11, 2017

My cap was loose on my 8n radiator so I ordered a new one from yt and it fits the same very loose the only way it seems snug but not to snug is if I turn it sideways about 1/4 turn. Any ideas why

Den N Ms · Mar 11, 2017

Bullseye,You must have a aftermarket radiator in your tractor.I have seen many of them that the neck in the radiator was clocked and soldered in the wrong position and has to be re-soldered in the correct position.

Tall T · Mar 11, 2017

(quoted from post at 20:54:06 03/11/17) My cap was loose on my 8n radiator so I ordered a new one from yt and it fits the same very loose the only way it seems snug but not to snug is if I turn it sideways about 1/4 turn. Any ideas why

Don't get "sideways about 1/4 turn" (?)

But if you mean turn the cap backward a little then I get it

sometimes you can get creative with the part of the cap that rides the underside of the rad pipe lip.
Sometimes one can add just the right ring gasket to take up the slack.

To reiterate . . .
if you mean that by backing it off from being full on, it gets tight enough . . . then if it doesn't vibrate away from that position it's found a new home. Or you could make it tighter with a gasket.

But since I've never seen an 8N cap
and there's talk about a wonky pipe
disregard this message.

ratface · Mar 12, 2017

does it hold pressure, because mine has always fit the way you describe and it holds pressure just fine.

Colin King · Mar 12, 2017

They can sometimes be a bit loose - I have two original radiators that the caps fit loosely on. However, they do pressurize. These are low pressure systems, so it doesn't require a perfect fit.

You can try tinkering with the tabs on the cap to see if you can improve the fit.

Colin, MN

Bullseye · Mar 13, 2017

Thanks for the info all.i don't think it will hold any pressure it is really loose and it doesn't hold enough when I turn it back some to stay very good at all
I'll try to adjust it somehow I haven't done a lot with it since ive been busy with other things.

Kiss4afrog · Mar 14, 2017

You can call and see if an auto parts store (NAPA, Oreilly, ...) in your area loans out a pressure tester. That way you'd know for sure if the caps holding pressure.

I haven't used one on a tractor but I'm hoping they just used the design from a car so the size isn't something odd.

This is just one of the "How-To" vids on youtube. https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=3&cad=rja&uact=8&ved=0ahUKEwjQq-2F0tbSAhXEjFQKHaGoBO8QtwIIKDAC&url=https%3A%2F%2Fwww.youtube.com%2Fwatch%3Fv%3D-mRlDUp7-nQ&usg=AFQjCNEQOK4JwFLxTsKZXaJbKOLNc-hN-w&sig2=GHiCzCrgha8ZJiu6m8NbgA

Loose radiator cap on 8n

Bullseye

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Den N Ms

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Tall T

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ratface

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Colin King

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Bullseye

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Kiss4afrog

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