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Just did rebuild on 5.2L motor head gasket was blown

Ok so i just got done rebuilding a motor for this jeep all new internal arts and the heads were checked and good 1 of them is brand new. just started it and immediately is blowing coolant out the exhaust what could it be

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I suspect that the head gasket is not under the proper tension
IT is very common for people to refit heads without first cleaning out the head stud holes ( thread tap and compressed air)
there is normally water or oil in the hole and as the stud is screwed it it compresses the water/oil and reaches tension by bottoming out on the obstruction but the gasket is not tight

Posted on Apr 20, 2015

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Posted on Jan 02, 2017

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1990 Honda Civic under 100,000 kms. Head gasket fixed 2008, again in 2009 and now we've been told it's going again....is this normal...or have we been duped by a bad repair shop twice?


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When i go to check my oil i find antifreeze in my oli. then when i changed my oli again antifreeze was coming out of the oil pan at the bottom of the motor.


Ok, You are going to have to rebuild the motor that is a given. There are several possible problems that could cause this. Blown head gasket, Cracked Head, Cracked Block, a hole rubbed in the timing chain cover if a timing chain guide came free. I had a Nissan do this. A couple of the holes that the retaining bolts go in for the timing chain guide open directly into a water channel and were letting Anti Freeze run free as well as a hole being ground into the aluminum cover over the timing chain by the chain flopping around. You won't know until you open it up and inspect everything.

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Oil and antifreeze mixture


Don't try to start the car anymore!  You have blown your head gasket.  Take the car to a mechanic and have them check the engine out to make sure you haven't done any further damage to the piston.  If not, have them replace the head gasket and you should be good.  Hopefully it's just the head gasket and you don't need to rebuild the motor.  Hope this helps.  Thanks for an honest rating and for using FixYa.

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