I've pulled the passenger side head (drivers ones proving to be annoying!) but i'm curious about some of the findings.
The engine was pressurising the cooling system, slightly, and using coolant, but drove fine and you could do 100's of miles in it a day without issue. Lots of short trips seemed to guzzle coolant, but a long trip would only use a little, suggesting it was leaking more when cold perhaps?
Spark plugs on 1 and 3 would turn orange over time. Its been like this for several years and i've finally decided to fix it as it seems to (finally!) be getting worse with some signs of water on the other bank.
I'm particularly curious having removing the head though, of how exactly its ended up the way it has.
Examining the head and pistons, you can see that 1, 3 and 7 all appear to have signs of steam cleaning, with the clean areas of the piston crowns and clean areas of the head. 5 looks pretty normal.
Moving over to the gasket, cylinder 1 has obvious rust on the firing ring, so we can imagine thats certainly a path between the water jacket and cyl 1. Oddly enough for the cylinder with the most obvious water route, its the dirtiest of the three cylinders. Cyl3 has a small amount of rust on the fire ring too. I guess i'm pondering how water got into these cylinders in the first place to rust the fire ring though... Especially 3, it doesnt appear to be near any water... Cyl 7 fire ring looks fine, infact theres nothing obvious at all around cyl 7, so not sure why its showing signs of steam cleaning. It is ofcourse adjacent to the water jacket, so it certainly could be leaking across from there.
Is there anything else i can check while its apart? Cylinder liners being the obvious question mark.
Ive put a stream of photos on imgur: https://imgur.com/a/PyyyvxJ