| | RE: Yamaha OX 66 Pressure Relief (poppet) Valve
Thanks for the explanation! Mine appears to open intermittantly, no overheat or alarm warning. Will check the valve out when I replace the T-stats. Seems to be a little difficult to access, tucked under the ECM below the top of the lower casing on the 250 HP OX 66. Any tips on how to get at it more easily? Also, sucked a lot of mud into the cooling system recently. Might have gummed up the valve and the T-stats.