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Subaru Forester 1998
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9 Posts
Discussion Starter · #1 ·
It’s a black bolt that’s laying flat X my son used a small Screwdriver to open the valve. It wouldn’t budge so he kept at trying to get it open… now it looks like a square now. How do I safely remove the bolt?
 

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2006 WX8, 2022 BWA
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1,360 Posts
It might be worth trying to break it loose when the engine is hot, just don't go more than 1/4 turn.
 

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Premium Member
2020 Onyx
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15,396 Posts
I hope you don't mean opening it when the radiator is pressurized!
 

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2005 Outback Wagon 3.0 L.L. Bean
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1,302 Posts
I'd resort to method 2 of air bleeding. That looks like a resentment waiting to be opened. Leave it as a reminder
 

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'98 Outback
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262 Posts
Ditto. Just leave it until you need a new radiator. Bleeding air will be more difficult, but not as difficult as dealing with that screw.
 

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2020 Outback Premier 2.5i
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1,409 Posts
Just in case you must remove it anyway, I might find a coarse threaded nut with an ID of around 1/2" (that would be 3/4" nut - probably could go larger). Then I'd mix up some 5 minute epoxy and pack some into the damaged portion, place the ID of the nut over the portion that hopefully will be turning and pack the nut with more epoxy. I would not try to turn the nut for at least 24 hours.

If it doesn't work, you will have filled up the damaged portion with epoxy. Maybe you'd have an opportunity to make a new slot in that.
 
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