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Old 09-26-2010, 11:10 PM
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radiator gurgling after brand new engine install.

its the first time i did a rebuild on a motor. i broke in the cam for a half hour like ive been told. no problems, engine stayed cool, nothing out of the norm. i shut the engine off and i can hear the radiator burbling. all the fluids are fresh. is there air in the systtem or something? no leaks. nothing bad, just gurgling noise. help!!!

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Old 09-27-2010, 01:03 AM
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More than likely just air purging out of the system. To aid the burping of the system I always drill one 3/16 hole in the parimeter of the thermostat.
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Old 09-27-2010, 05:17 AM
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drill into the intake? or drill into the tstat itself? i have my overflow hooked up wont it just eventually burp it all out after running it for a while. i already ran it for a half hour for the break in.
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Old 09-27-2010, 05:49 AM
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you want tp drill 2 holes in the t-stat. drill 1/8" holes on either side of the flange that sits on the manifold.make sure the holes are 180 degrees from each other.
the overfow has nothing to do with air in the system, it is for expansion of hot coolant after the motor is shut off .
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Old 09-27-2010, 09:37 AM
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is this the only way to purge the system or will driving it just do it
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Old 09-27-2010, 09:44 AM
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jls4speed,

I think the thermostat is stuck in the closed position. When the engine is shut down the heat builds up and you hear that rumbling sound.

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Old 09-27-2010, 09:50 AM
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Did you just fill the radiator before you started the engine and haven't topped it off yet? I would've filled the rad, left the cap off, let the engine run until the t-stat opens or until you see some steam, then top it off and cap it.
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Old 09-27-2010, 02:30 PM
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motor isnt over heating after a half hour of running. tstat cant be stuck closed
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Old 09-27-2010, 02:55 PM
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jls4speed,

I have seen this happen more times than I can count. Replace the thermostat and it will be good to go. You can take it out and run it to see if the problem goes away if you want to test the theory.

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Old 09-27-2010, 03:06 PM
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I always do as two of the other posts have mentioned . Drill a hole in the flange of the thermostat . I used to drill a bigger hole than I do now . One 1/8" hole works for me and still lets the engine get up to temp quickly . Go bigger if you like but do drill a hole .
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Old 09-27-2010, 05:49 PM
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Heres some pics i found for you to see .


Cole
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Old 09-27-2010, 06:21 PM
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If you don't want to take the thermostat housing off to drill it, you may get by with burping it, purge air. With the cap off rev the engine some, you'll see water moving through, that'll push air out. Add coolant as you go, cap it as soon as you've done that a few times.

It's old school, but it's worked for me.
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Old 09-27-2010, 06:28 PM
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Quote:
Originally Posted by 68NovaSS
If you don't want to take the thermostat housing off to drill it, you may get by with burping it, purge air. With the cap off rev the engine some, you'll see water moving through, that'll push air out. Add coolant as you go, cap it as soon as you've done that a few times.

It's old school, but it's worked for me.

X2 This is how i always do it also and it has always worked for me too.
The pics above are to show you what the others are talking about.

Cole
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Old 09-27-2010, 08:46 PM
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thanks so much guys. i feel pretty idiot about now. now if someone can guide me to a starter that wont grind my brand new flywheel to sht it would be awesome. i posted a couple different threads. it has been the hardest problem i have ever come across in my entire history of doing work on cars. truly mind boggling. ive gotten the gears to mesh to a paper clips thickness so many times then bam grind grind whine curse curse throw tools.
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