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Old 01-15-2021, 06:39 PM   #1
osaltyone
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Coolant leak from oil pan

Got the truck up and running and have been trying to figure out my coolant issue. Thought I’d post here to see. I have a LM7 in my 49 3100. Swapped the oil pan with one that has a lower profile, but seems like I have a coolant leak in one of the spots that had a hole for a bolt but my block doesn’t have a bolt hole. Anyone run into this? When it’s @ 190 seems to just pour from there.
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Old 01-15-2021, 09:05 PM   #2
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Re: Coolant leak from oil pan

Think i found the issues. Coolant temp sensor is leaking I’ll swap it when engine is cool again. Odd that oil pan bolt is not there though.
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Old 01-15-2021, 11:11 PM   #3
Captainfab
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Re: Coolant leak from oil pan

I would have drilled and tapped the block for that bolt.
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Old 01-16-2021, 02:03 AM   #4
gmc684x4
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Re: Coolant leak from oil pan

Looks like the gasket is off center on that hole
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Old 01-16-2021, 06:47 PM   #5
LS short box
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Re: Coolant leak from oil pan

Be careful when you replace the temp sensor and don't over tighten as they will break quite easily. Ask me how I know.
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Old 01-25-2021, 09:53 PM   #6
derotoreut
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Re: Coolant leak from oil pan

My LM7 is the same as yours. No bolt drilled / tapped there.
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Old 01-25-2021, 10:29 PM   #7
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Re: Coolant leak from oil pan

Quote:
Originally Posted by derotoreut View Post
My LM7 is the same as yours. No bolt drilled / tapped there.
Good to hear it’s not just mine.

Coolant temp sensor was backed out for some reason. Maybe when I had the engine out and cleaned everything.
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Old 01-26-2021, 09:41 PM   #8
derotoreut
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Re: Coolant leak from oil pan

Quote:
Originally Posted by osaltyone View Post
Good to hear it’s not just mine.

Coolant temp sensor was backed out for some reason. Maybe when I had the engine out and cleaned everything.
Glad to hear that's all it was. Got to love an easy fix.
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