Hey guys, first of all I just wanted to introduce myself. My name's Dave, I'm a junior at Penn State and just bought my first Jeep a month or so ago. (I also own a 96 F250 Powerstroke so if there are any Ford guys on here, you may notice me on the Ford Truck Enthusiasts forum under the same username). I've always wanted a Wrangler so when a good deal came about on one from a family friend, I couldn't turn it down. It's a 95 YJ Rio Grande (so 4cly, 5spd) with 115k on it.
Anyway, on to my question. Shortly after I bought it, it started overheating, I believe due to a radiator leak. I flushed the radiator, added that Bars stop leak stuff and it started running at normal temps again. A few days ago it started overheating again. I replaced the radiator but that didnt solve the problem. I noticed when I poured in coolant, that it would all leak out the bottom. I replaced the water pump today and assumed that was the problem, but it doesnt appear to be it. The leak is slower now, but I still cant drive more than about 3 miles without it overheating. The coolant drips off the front of the engine block somewhere near the bottom most pulley. It looks like its coming from the oil pan, but I cant pin point exactly where its coming from. I've narrowed it down to a few possibilities.
1). Blown head gasket- coolant seeping into oil and dripping out of the oil pan. Obviously I hope it's not this since that would require me doing the most work, but I'm not sure if it's that because it's dripping straight coolant, not the blackish yellow mixture I'd expect. Also, When I pull the dipstick, the oil is pretty black, it doesnt look contaminated. But I don't know a ton about blown head gaskets so it could still be that.
2). I may have damaged the water pump gasket when installing the new water pump. The gasket was a flimsy piece of junk that pretty much looked like cardboard and I noticed it had a small cut in it from the factory. The cut wasnt all the way through the gasket, but i did have to force the pump in place and its possible that I may have even screwed a bolt through the gasket. I can't be sure until I tear everything back apart tomorrow night.
Originally I considered a pinhole in a hose as a potential issue, but after driving it,the coolant started pouring out the bottom, much faster than it would out of a hole in the line. Any suggestions from you long time Jeep owners? I'm finding the tiny 4cly is a simple engine to work on, but I still haven't owned it long enough to know much about it. Any advice would be greatly appreciated.