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Hairline crack by thermostat - Any hope in fixing it?

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Old 06-17-2017, 11:36 PM   #1
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Hairline crack by thermostat - Any hope in fixing it?

Hey guys, I replaced my thermostat on the top of my lower intake manifold awhile back, and I ended up tightening it down snug enough to the point I made a hairline crack I didn't even need to replace the thermo but there's nothing I can do now

It'll hiss out coolant when the engine warms up, and I don't want to drive the car like this. Is there any way/suggestions as to how I can fix this crack? I'd rather not have to swap the entire lower intake manifold if not necessary

Thanks in advance guys
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Old 06-18-2017, 04:31 AM   #2
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Re: Hairline crack by thermostat - Any hope in fixing it?

Hi there,
You might try JB Weld. It would be tricky doing it without removing the intake, but if you have a flexible finger, you might smear some inside there. Can't say how long it would last (if any) or if it will hold under pressure. Might be worth a shot before removing/replacing the intake.
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Old 06-18-2017, 06:43 AM   #3
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Re: Hairline crack by thermostat - Any hope in fixing it?

Quote:
Originally Posted by LiveIt! View Post
Hey guys, I replaced my thermostat on the top of my lower intake manifold awhile back, and I ended up tightening it down snug enough to the point I made a hairline crack I didn't even need to replace the thermo but there's nothing I can do now

It'll hiss out coolant when the engine warms up, and I don't want to drive the car like this. Is there any way/suggestions as to how I can fix this crack? I'd rather not have to swap the entire lower intake manifold if not necessary

Thanks in advance guys
Another vote for JB Weld. That is good stuff and they make a high temp version. Just make sure it is dry before you apply it. You got nothin to lose by trying it.
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Old 06-18-2017, 07:39 AM   #4
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Re: Hairline crack by thermostat - Any hope in fixing it?

What about quik steel?
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Old 06-18-2017, 12:12 PM   #5
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Re: Hairline crack by thermostat - Any hope in fixing it?

Maybe I'm not understanding what has the hairline crack, so a picture of the cabbage will help.
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Old 06-18-2017, 01:50 PM   #6
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Re: Hairline crack by thermostat - Any hope in fixing it?

All great advice guys, many thanks
I took pictures but completely forgot to upload them here! The crack's a bit hard to see but it's there, I was wrong about this being the thermostat as it's actually the coolant temp sensor

Here's some pics-







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Old 06-18-2017, 10:38 PM   #7
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Re: Hairline crack by thermostat - Any hope in fixing it?

Yeah... the only way to fix that is to remove the LIM from the engine, then replace it or weld it.

JB weld might delay the need to do that, but eventually you'll need to pull it.
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