I just installed a rebuilt 3.0 motor. Motor ran great for about 20 miles. I now have a major coolant leak into the exhaust system. There is a hole in the muffler and a large puddle of coolant under the truck. My question is, intake gasket or head gasket? I pulled everything off and removed the intake. I did not see anything that definitely says intake gasket leak. There seemed to be a little moisture in the plenum. Just not 100% sure it is the intake. What say ye? Did I mention it is a major leak? Truck ran for 30 seconds, puddle at least a foot in diameter under the muffler.

 

Hate to tell ya...That's typically the HG.

 

Once its fixed you should clean or replace the contaminated 02 sensor, same with Cat.

 

sounds to me like a HG. Good luck

 

Found out it was the head gasket. Being a rebuilt motor purchased from a vendor(they installed the head gasket and torqued the heads to the block). What should I expect them to do? I now have a lot of money tied up in this project that is going to have to be spent again due to an issue out of my control. Labor, fluids, gaskets, etc.