Re: Mysterious coolant Leak
[Re: mopars4ever]
#2859098
12/12/20 08:31 PM
12/12/20 08:31 PM
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Joined: Jul 2007
Posts: 1,526 North Carolina
cjskotni
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pro stock
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OP
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North Carolina
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Maybe exhaust manifold stud/bolt leaking and running down. Forgot to mention...this motor has Eddy RPM heads. I seem to recall those not being wet bolts.
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Re: Mysterious coolant Leak
[Re: cjskotni]
#2859143
12/12/20 10:19 PM
12/12/20 10:19 PM
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Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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You might use this "tank valve" which is less than $3 at O'reillys. screw it into the 1/8 NPT coolant temp sensor & add some psi from your air chuck & grab your tire psi gauge & pump in 5 or 10 psi. use short blips with the air chuck cuz you can reach a critical psi quick & blow out some coolant hoses real quick (it ain't like airing up a tire). it'll make the leak leak
live every 24 hour block of time like it's your last day on earth
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Re: Mysterious coolant Leak
[Re: cudaman1969]
#2859207
12/13/20 08:57 AM
12/13/20 08:57 AM
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Joined: Jul 2007
Posts: 1,526 North Carolina
cjskotni
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Head gasket, I had one that squirted a thin stream under pressure. I used the pump up tool on the radiator, almost 20 psi before I found it. Blue gel-pro gasket, almost new This leak is from an engine sitting for three weeks with no oil pan. I can't imagine a blown head gasket would leak like this...especially since I saw no white smoke or lost any appreciable amount of coolant before I tore it down.
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Re: Mysterious coolant Leak
[Re: cjskotni]
#2859376
12/13/20 01:45 PM
12/13/20 01:45 PM
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Joined: Jan 2003
Posts: 15,383 Omaha Ne
TJP
I Live Here
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I Live Here
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Omaha Ne
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Head gasket, I had one that squirted a thin stream under pressure. I used the pump up tool on the radiator, almost 20 psi before I found it. Blue gel-pro gasket, almost new This leak is from an engine sitting for three weeks with no oil pan. I can't imagine a blown head gasket would leak like this...especially since I saw no white smoke or lost any appreciable amount of coolant before I tore it down. So you want to dispute the suggestion ??? Looking a bare block you don't have many other sources other than a head gasket or bolt. It's doubtful an exhaust or head bolt leak would find it's way to the center of the motor. So that leaves intake bolt (if drilled through), a head gasket, or the heater A/c system. Is the back of the block inside the floor tunnel or in front of it. I might suggest laying under the car and looking straight up to see if their is any coolant hoses, heater /ac box etc. directly above the area of the drip. Leaks typically do not go sideways but rather straight down that is assuming they haven't a ledge or lip to follow. Another thing to keep in mind, with the car sitting with the front raised up, the heater core, valves, hose connections are under more head pressure. HMMM Or one could put a camera on it and possibly record the event and capture the source Myself I agree with the previously suggestion(s) time for a pressure check
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Re: Mysterious coolant Leak
[Re: cjskotni]
#2859494
12/13/20 05:14 PM
12/13/20 05:14 PM
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Joined: Jan 2004
Posts: 8,274 fredericksburg,va
cudaman1969
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master
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Posts: 8,274
fredericksburg,va
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Head gasket, I had one that squirted a thin stream under pressure. I used the pump up tool on the radiator, almost 20 psi before I found it. Blue gel-pro gasket, almost new This leak is from an engine sitting for three weeks with no oil pan. I can't imagine a blown head gasket would leak like this...especially since I saw no white smoke or lost any appreciable amount of coolant before I tore it down. It wasn’t ‘blown’ it was coming straight out the front from the little hole in the lower corner. Defect in the gasket is the only thing I can figure
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Re: Mysterious coolant Leak
[Re: dvw]
#2859707
12/14/20 07:29 AM
12/14/20 07:29 AM
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Joined: Jul 2007
Posts: 1,526 North Carolina
cjskotni
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Wh haven’t you pressure checked it? Dougy Well I got a pressure test kit from a buddy and we pumped the system up to 18 psi. Aside from my lower hose leaking a bit, we were able to replicate the leak coming from the number 8 cylinder - a small drop on the piston skirt. The leak can't be that bad as once the lower hose bled down to about 15 psi, it stopped leaking and the system held pressure. I was then thinking, maybe head gasket, so I pulled the number eight spark plug and expecting a burst of coolant, I got nothing. Plug looks good. I used my handy borescope and inspected the cylinder. From what we can tell, I might have a casting defect where some of the coolant is weeping through the cylinder wall about an inch below the head gasket. If you look at the pictures you can see the little droplets of coolant on the cylinder wall - but they are all well below the head gasket. We ran the scope around the top of the cylinder/gasket and saw no sings of moisture. So the verdict is - very small leak through the cylinder wall in the number 8 cylinder. Since I likely have had this likely going on for years and it isn't diluting the oil from what I can tell (after 2 years/2000 miles), I am going to run it as-is with the plans that eventually I will need to pull the motor and get it re-sleeved.
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Re: Mysterious coolant Leak
[Re: NITROUSN]
#2859866
12/14/20 03:10 PM
12/14/20 03:10 PM
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Joined: Sep 2003
Posts: 19,421 north of coder
moparx
"Butt Crack Bob"
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"Butt Crack Bob"
Joined: Sep 2003
Posts: 19,421
north of coder
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there is a blue bottle of stuff called K-Seal. that stuff seems to work pretty good, and might work for what you are doing. the "roadkill" guys used a few bottles of this stuff to seal up a smoking head gasket on one of their episodes, and it stopped their severe leak [along with a new radiator cap] of course they beat on the car severely, which i don't think you are going [or planning] to do. you might want to try some of that stuff. sorry i don't have a link.
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Re: Mysterious coolant Leak
[Re: ek3]
#2860038
12/14/20 08:23 PM
12/14/20 08:23 PM
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Joined: Jan 2004
Posts: 8,274 fredericksburg,va
cudaman1969
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master
Joined: Jan 2004
Posts: 8,274
fredericksburg,va
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flush it out real good and use water only... get the temp up to 200 or a little higher like its about to overheat. the reason to do that is it will open the crack real good. if it stops the leak, it will prob. never leak again unless you get it hotter than when you made this repair. there are many products with many issues. this works really well and last. Buy this ! https://www.jegs.com/i/Moroso/710/3...=4579878248437694&utm_content=Moroso It says not to use with antifreeze, I’m guessing water on first application, once it’s sealed use the mix?
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