Reply To: 1968 Johnson 40hp overheating

[lindy46]

There is no seal on the bottom of the housing – the poppet just seats right against the hard plastic of the housing. Parts diagram doesn’t show any other seal – just the rubber gasket (22) which seals the the bottom of the housing to the thermostat housing. The hole in that gasket is much larger than the poppet. I’m trying a rubber gasket with the same sized hole as the hole in the bottom of the housing. The poppet should now seal against the rubber.