Well for the last year our so I would have to add a little coolant. Maybe like a gallon total after 3-4 months. I finally got fed up with it and started checking where these little drops came from. I thought it was the freeze plugs on the initial inspection, so just to be sure I did a pressure test. I could see it start coming out from above the freeze plugs so I assumed the head gasket. So, today I ripped off the intake and header just to find that it wasn't the head gasket. The coolant is actually seeping out of these cracks. It is 4 "v" shaped cracks in the block. My main question is had anyone else ever seen this? Also, if you have, what causes it?
I know this motor hasn't been overheated. I bought the rebuilt 4.0 from a close friend that has a shop he rebuilds motors for a living. I called him and he said to bring the motor by so he could tear it down. Btw it's supposed to be bored .040, a small cam, hvop, and the head is shaved .040. I got it out and I'm taking it over there in a minute. He said in about an hour he could tear it down and he could tell me what happened.
Well, he called me around lunch yesterday and said that the reason it cracked was because the extra compression was too much stress on the block. He also said that eventually it would have broke enough to blow the head off the top. This is his reason for the v-shaped cracks. So I drove about two hours away to pick up another motor. He's going to trade me the rebuilding of the new motor (bore the cylinders, shave the head, swap in my cam, and grind the crank with new bearings and seals) for me to do some trans r&r labor. I guess we'll see how long this block lasts.
Me too. He swapped all my stuff and I installed it today. This motor doesn't seem to have as much power to me. Before I could atleast chirp in 2nd, maybe I can't because it's warmer. Oh well, it's all done now, I'll just drive it until it breaks again :-) which will probably be soon.
Yep..seen it last week on my cousins Jeep. Previous owner had a leaky radiator, kept adding plain ol' water..winter came and froze the block..all freeze plugs were buldged (looks like yours to0) and cracked the block in the same place as yours. To bad the freeze plugs didn't do their job
__________________ Tom- Brookfield, CT-'95 Wrangler, Metalcloak front and rear fenders, Fox Fabrication Rocker Guards, 36" IROKS on ARE 23's, 2.5" Springs, 1" shackel, XRC8, Fox Fabrication Front Stinger Bumper, Warn Fog Lights, KC 130W Daylighters, Skyjacker Shocks, CB, Optima Yellow Top