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Old 04-15-2020, 10:51 AM   #1
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Surge/Overflow tank replacement

While troubleshooting another issue at Quartzsite this year, it was pointed out to me that there was some leaking going on around the filler neck of my nylon/plastic radiator surge/overflow tank. It wasn't the cap. It was more of a bubbly mist (a technical term, I know) coming from 2-3 inches below the cap. I recently decided to replace the tank with the steel version sourced from Veurinks and it arrived yesterday along with two 90 degree fittings that will replace the original ones from the top of the old tank.

The question I have is about two identical threaded holes on the front of the tank. You can see them above the sightglass and below the filler neck. I assume they are for applications where it's easier to route the two "input hoses" to the front, but Veurinks does not have an answer. Any thoughts?

Finally, what are "best practices" when inserting threaded plugs in a situation like this? Thread lock, teflon tape???
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Old 04-15-2020, 11:23 AM   #2
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This is what I use Barry,

https://www.permatex.com/products/th...hread-sealant/

but I'd think a couple wraps of teflon tape would work as well.

Sorry, don't know about the extra holes.
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Old 04-15-2020, 03:04 PM   #3
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Thanks, Ben!
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Old 04-15-2020, 03:39 PM   #4
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Our tank uses a coolant level sensor in one of the front holes. I would just plug the other one.
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Old 04-15-2020, 03:49 PM   #5
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On some early models those two "front" holes would have been on top, the tank was flipped 90 degrees. That guy would be asking what the two holes on the "front" were as well.

He didn't get a sight guage though.
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Old 04-15-2020, 05:18 PM   #6
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Barry,
My old plastic coolant tank had those 2 holes. This new one doesn't. They were plugged until I replaced the tank a couple years ago.
My coolant sensor goes in the back of this tank. Its plastic.
Be real careful you don't cross thread the sensor. My threads were damaged and it kept leaking. I ended up replacing that sensor.

I just used teflon tape to seal everything up.

Picture posted sideways. Obviously the site glass is on the side, not the top.
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