I've got these 2 W50's, neither of which came with an expansion tank. I think I'll put one in. Hang it, high in the engine bay, attach it to the output at the radiator cap. One of the radiator caps is 4#. The other one is 16#. Which is closer to correct? The cap on the engine in the boat is the 4# one.
Oh, and quick source for 1 7/8" O.D. exhaust injection elbow? I can't find where I found them before.
Edit: I'm going to go with 1.5" NPT and weld in a nipple on the downhill side. The manifold is cast iron, the pipe is iron, why would I put a piece of cast aluminum in the middle of that and run salt water through it? It worked for years on my Volvo MD2B. Comments?
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