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C200 gas head gasket

L

langdangnebraska

Member
Good morning everyone. Over the past year I resurrected an old 674 gas. It sat outside for a few years and became locked up. I carefully pried the flywheel back and forth
until it was unstuck. 3 of the 4 cylinders had stuck valves. No big deal, I got everything free and adjusted correctly. I recently used it and when the thermostat opened
it starting pouring anti freeze out of exhaust port #1(i believe, closest to the radiator). Tore the head off, the gasket didn't look bad and both surfaces didn't look
that bad at all. Before I tear into the block, does anyone have any other ideas why this could be happening? I pondered water pump gaskets, but I don't know if that would
cause it. Any input would be greatly appreciated. Thank you.
 
Having the head checked for cracks is also important. Water in the head can freeze and cracl ports without getting into the cylinder. Jim
 
'Pouring should be easy to find.

Look the head over closely for cracks or a bad casting, especially in and around the exhaust port. Might can block off the thermostat hole, lay it upside down and fill it with water, look for leaks.

Look the block over closely for cracks around the head bolt holes, and down the cylinder.

A head gasket that is hemorrhaging that bad should be easy to see, and would have been supercharging the radiator with steam!
 
Had a 351/400 Ford Cleveland crack up inside the exhaust port, probably back in the 80's.

It laid wide open, and for no apparent reason, wasn't overheated prior that I know of, and didn't freeze. Even the machine shop missed it, I found it after putting it all back together and it still leaked.

Must have been some strange internal stress that decided to let go after 100,000 miles.
 
Are you sure it is not the water pump leaking at the shaft, maybe a gasket or hose leaking and just being blown back by the fan? I am not sure if the operation of the thermostat has any relation to your problem. An open thermostat would put less pressure on the head gasket.
 
I'm going to get the head tested tomorrow. When I get home I'm going to crank it over a few times and see if I can find any cracks. Thanks for the info everyone.
 
I'm not sure about your engine, but some with cylinder liners, they just sit in the block. With the head off they will ride up if you turn the engine through.

Once one moves, it has to come out and the oring replaced, the bottom of the block cleaned to get it seated back in, big job!

If it has liners, best clamp them down with bolts and washers just to be safe.
 
the c200 dosen't have liners. the cylinders looked fine yesterday when i rotated it and the crankcase isnt full of oil. i'm pretty sure it's the head. i drop it off today to get it tested.
 
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