Mechanics apply with in

StrokerScamp said
If it is a leak from compression escaping from the cylinder, I don't know of anything, nor have I ever seen anything that can fix the problem, even temporarily by adding to the coolant. I have seen products that claim to but never worked. You'd be talkin about easily in excess of 100 PSI and probably more like 150 PSI. That's a lot. Now if it's just leakin coolant from the water jacket side with no compression then I would give it a try.

I agree with stroker on this and his last post. get a friend that has a pressure tester- you install it where the rad cap goes. (radiator or overflow tank-can't remember that particular one) pinch off the overflow hose from the rad to the overflow bottle w/ a vise grip. Pump up to rad cap spec- usually 13-16 lbs. You'll either see or hear the leak! This takes all the guess work out. That's how we chase it down in my shop. the head gaskets aren't that big of a deal on the 4.0's. 97 should be a normal head not OHC. You need new head bolts, resurface and pressure check the head (do BOTH heads- AMHIK) and you'll need a torque to yield adaptor or some white out (yeah the stuff for correcting paper mistakes) the procedure for the head bolts are retarded. Something like torque to 13 ft lbs. back off 1 1/2 turn, torque to 32 lbs, turn 90 degrees, turn another 90 degrees etc.. All i did when i started wrenching on these is used white out on the bolt head and made a spot on the head that I could track my progress. This is a day job at worse. Problem childs are the studs on the heads for the exhaust- use PD Blaster. Any other problems PM me....Good luck