LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

Corroded radiator drain valve

Old May 11, 2004 | 04:54 PM
  #1  
htweels86's Avatar
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Corroded radiator drain valve

Yes, I'm pretty sure it's stuck. First I tried to turn it the way I would think it turns, and when that didn't work I tried turning it in the opposite direction, no results again. I got pliers on it and turned it, and that only ended up ripping the plastic grips off. I've tried to use a pocket knife (VERY carefully!) to cut the cap off the valve, but that would probably take way more time and energy than I have to spend on this. Is there anything I can do, or has this happened to anyone else?? Maybe something like WD40, or am I just screwed and need to buy a new radiator for ~250 bucks. Yes, I searched, but didn't find anything.
Old May 11, 2004 | 05:08 PM
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That valve is made of plastic. I had the same problem but managed to take it out with some pliers even after braking off the grips.

Try heating it up with a propane torch a little. A propane lighter might work too.
Old May 11, 2004 | 05:30 PM
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Originally posted by madwolf
That valve is made of plastic. I had the same problem but managed to take it out with some pliers even after braking off the grips.

Try heating it up with a propane torch a little. A propane lighter might work too.
I have a propane torch, but never thought of doing that with plastic...hmmm, sounds interesting tho. Thnx man, I'll give it a try!

One quick question, where did you apply the flame? I don't want to melt the thing.

Last edited by htweels86; May 11, 2004 at 05:34 PM.
Old May 11, 2004 | 05:34 PM
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As long as you keep a little bit of distance, you'll be ok. The plastic will get hot (but don't heat it up till it melts) and should come out right away.

Try applying around it first... but since it's broken off, you'll probably have to apply directly over it. Just let it melt a little bit, then stick a knife in it, let it cool down a bit and turn.

Last edited by madwolf; May 11, 2004 at 05:36 PM.
Old May 11, 2004 | 05:41 PM
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I forgot to mention... don't forget to find a new valve first.
Also, I edited the last post. Don't know if you noticed it.
Old May 11, 2004 | 05:47 PM
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Forget about the valve,just remove the bottom hose.
Old May 11, 2004 | 06:36 PM
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Well I got it up on jack stands, and flamed it for a little while making it glow nice 'n orange. I let it cool for about a minute then just hit the side of the valve with a vice grip, then used the vice grip to turn it. And it turns! Now to worry about how to get the coolant out of *both* blocks... Maybe shoebox's site can help.
Old May 11, 2004 | 06:39 PM
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Haha... I love the propane torch. I always carry it with me to light the cigar.... err...hmmm maybe that's a bit too many details.
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