Motor rebuilt complete, 7-8 hours on it. Yes purple W/yellow stripe to coil and purple to coil W/spliced orange wire to coil and a green wire to coil and a red W/black from relay going to coil as well.
Wish, replaced everything. Down to wiring now that seems to be whats wrong. Boat is 30 years old garage kept but nobody wants to work on it.
Not sure what that is.
Yes, back pressure coming out of overflow at high rpms
is it coming out of the plastic over-flow tank? if so, drain your cooling system and pressure test (easy as hell on a 470). you probably lost the head gasket.
Had coolant tank tested and is good, complete motor rebuilt with maybe 8 hours on it. Got some wiring issues, resistance wire is wrong wire, coil heating up.
Ordered resistance kit, somebody put regular wire spliced into on it
No, removed it, looks new, ran water througb all ports, flow easy.
without pressure testing, you do not know if you have a cracked tube sheet or other problems that would cause the symptoms you are describing.
Could a bad HX do that? coolant can leak to the raw water side, but it would take increased pressure in the freshwater side to flow out the overflow tank. You should pressure test the system, but it could still hold pressure with a bad head gasket. Did you pressure test the radiator cap? That could cause antifreeze to back up into the overflow. Bad head gasket would have a violent backflow, with air in there as well. You can check with a clear hose between the reservoir and the overflow, or check the antifreeze for combustion gases (they make test kits for that). Also, are you overheating at all, especially at the high rpms?
