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Brother's Avatar
 
Join Date: Aug 2004
Location: San Antonio, TX
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Thermostat

On the external thermostat, how do you remove any lines without stripping the threads and having to replace the tstat?

I just finished Wilkinson's book and he mentions that he screwed his up in the one of the last few chapters. My parts should be here tuesday and I need to replace both lines coming back to the engine and tank.

Is there any chance that I'm not buying a new thermostat?

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Paul

1980 911SC Targa - Sold
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Old 02-27-2005, 04:39 PM
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The easiest way to remove them if you are not going to reuse them is to cut the nut with a Dremel tool with a small cut off wheel. This way the bib nut splits and you will not harm the threads.

Jeff
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Old 02-27-2005, 05:47 PM
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good idea. I'll try that unless I find something that takes less effort.
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1980 911SC Targa - Sold
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Old 02-27-2005, 06:15 PM
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It really only takes a few minutes. just one cut 90 degrees to the thread direction is all it takes (down the length of the nut)

Jeff
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Old 02-28-2005, 07:21 PM
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I think that is what i'll do then.
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1980 911SC Targa - Sold
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Old 03-01-2005, 02:18 AM
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Cutting the nuts of course ruins your lines, which end up being much more expensive than the t-stat. So, if you're not reusing the lines, this is a good approach, otherwise, you'll want to try something else. I used a combination of hammering a wrench and sheer force. In the end I only had to cut one nut off and didn't ruin any threads. The other approach is to use an air chisel to turn the nut. I've heard this is very effective, but have not personally tired it. A search will reveal dozens of posts on this same topic.

Good luck.
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Old 03-01-2005, 09:11 AM
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This is will destroy the lines you are right. Only use this if you have new lines on hand.

Jeff
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Old 03-01-2005, 10:08 AM
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Brother,
I assume (like Jeff did) that you are trying to remove just the lines you are replacing. The cutoff wheel or Dremel is the safe way to go. Use a chisel to simultaniously unscrew+separate the nut (put the tip in the cut).

Because the big oil lines connections can be so "resistant to change" I try to avoid removing/unscrewing any lines that aren't being replaced.
This usually involves taking the whole oil lines+thermostat and sometimes the oil tank out as a unit to get access to the nuts on the thermostat. I found that the lines at the front cooler usually unscrew OK.
Yeah, I know I'm a weenie but it's cheaper than wrecking a thermostat.

If you wind up removing the oil lines and thermostat together, cover the front rotor&caliper to keep oil from contaminating your brakes and put some masking tape around the fender lip to protect it. I always use a helper for this task because the lines are so long and unwieldy.
-Chris
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Last edited by ChrisBennet; 03-01-2005 at 04:56 PM..
Old 03-01-2005, 10:40 AM
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We will cut those bad johnnies off this weekend. Did you apply anything to the new threads?
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1980 911SC Targa - Sold
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Old 03-01-2005, 03:19 PM
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I put a small amount of antisieze on them but I am not sure if it will do any good.

Jeff
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Old 03-01-2005, 03:25 PM
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I suppose I want them to sieze up pretty good (with no leaks).
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1980 911SC Targa - Sold
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Old 03-01-2005, 06:38 PM
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Quote:
Originally posted by Brother
I suppose I want them to sieze up pretty good (with no leaks).
The don't seal on the the threads, they seal at the end. Corrosion won't make them seal any better.
-Chris

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Old 03-01-2005, 07:00 PM
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