So I was driving my Disco II one day and I started getting a misfire on Nr. 6 Cylinder code.Shortly their after steam started bellowing out the tailpipe. I got the vehicle home, tore the heads off. The Nr. 6 cylinder was steam cleaned as I expected. I checked the head for warping, all seems fine. Since the water passages are next to Nr. 2&8 cylinder I dont think it was a head gasket causing the problem. Reading the forums everyone seems to jump to cracked block after the head gasket. I also inspected the liners, it looks good but sometimes the cracks are tiny.

Does cooolant jacket the valves on these Engines?
Can a valve seat fail and cause water to leak into a cylinder?

I dont want to spend a lot of money on this thing because I was actually driving it to trade the vehicle in when this all occurred. If it has a cracked block, of to the salvage yard this thing goes, unless someone wants it for cheap.

 

no a valve seat wont fail and cause coolant. but a cracked head could. but only on cylinders on the ends. In the middle and you are looking at the block. the coolant flows around all the cylinders in the block only. Slipped liners or cracked blocks cause the issue with the coolant dumping into the cylinders.

 

The spec for flatness is 0.002 inch, about one half the thickness of your printer paper. Looks may not be so precise. Of course now that you have heads off you can rent block test equipment, will need a source of shop level air pressure.