I've seen this before on older engines that experienced excessive coolant change intervals. Rust and crud builds up and plugs the drain hole. Take out the drain plug and use a piece of wire or a small screw driver the break up the sludge that is preventing coolant from draining. I'd highly recommend using any of the commercial cooling system flush products on the engine, perhaps a couple of times.
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No coolant coming out of block
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Mine was dry every time I took it off. I thought it was because of the issue I have with a cracked head and coolant loss.
I jammed a long thin allen wrench up there and mine was filled with crud. I finally poked through it and a liter of water came out. Get a good stiff something to ream out the crud. I'll definitely be doing a lot of flushing once I get the head back together.
Good luck'74 2002 - Build blog at
nomads2002.blogspot.com
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