Originally Posted by jomandm

Thanks everyone for the information. Just an update, I removed the heads this weekend. The #4 cylinder was steamed clean compared to the other cylinders. See the attached photos. The actual head gasket seemed to be in good condition. There did not seem to be any abnormalities or imperfections in it. Head bolts took some effort to get off so I do not think that they had loosened up any. From what I have read about dropped sleeves, it does not appear that this has happened to me. How does everyone think coolant could be getting into that cylinder and vice versa exhaust pressurizing the coolant out of the overflow tank? I know there is a possibility of a cracked block but hoping this isn't it. I will get my heads checked for flatness to see if those are not true.

Just as additional information I did a compression check of the engine prior to tear down.
1-175psi
2-200psi
3-175psi
4-165psi
5-150 psi
6-175psi
7-175psi
8-180psi

Thanks

Originally Posted by Charlie_V

It really has to be a crack or some small head gasket issue. But I'm surprised the compression figure is still so high and close to average compared to the other cylinders. The block can crack around the bolts and behind the liners. I'd hope it is your head gasket since you have already opened it up (assuming you opened it to see the steam cleaned cylinder).