Thanks all. Rick, that's the sort of nightmare story I'm hoping to avoid! When you say corners were cut "on the exhaust elbow, hose routing, and the siphon break" do you mean the prior engine had those things installed in a poor manner, or that a siphon break wasn't installed?
I haven't heard from any Landfall 38 owners about layout (where the loop is mounted), so if any of those folks have one I'd still be interested in that. I did wonder about temperature. I think the exchanger raw water output is not as hot as the exhaust? Forespar says Marelon is okay to 170F. Interestingly the Scot loop says 140 F max temp, which is pretty low. Maybe because their vent parts are made out of plastic Delrin, or they're just being conservative. In the diagram Paul sent me they show the loop in use between the exchanger and exhaust elbow, so obviously they intend for it to be used in that role. I guess most people do the loop between the exchanger outlet and the exhaust elbow because it's easier to install there than in between the water pump and the exchanger inlet. And presuming the water is below 170F then Marelon is okay in either location. I agree the exhaust transom exit is probably the greater risk in most cases. I already have an ample exhaust hose rise there though, and the waterlock muffler should prevent siphoning afaik. It'd take a lot for following waves to push past a 3 foot rise in a 1.5" hose and then through an exhaust riser. I'd consider an exhaust lock (inline, in an accessible location) if I'm worried about that. Hanging from the transom in ocean swells to insert a plug doesn't seem viable. -Patrick '84 C&C LF38
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