Reply To: My Mercury Runs Hot?

[Don]

Hopefully a Merc guy will chime in here….I can reply when it comes to the OMCs, but not the Mercs…
It all depends on where the indicator is tapped into the engine.
On most OMCs, the indicator tap is located on the exhaust manifold, which is at the beginning of the cooling cycle. So, the telltale flow should never get “hot”, it should always be pretty cool, perhaps a bit warm in this hot weather.
That is a nice old Merc, so let’s wait to hear from a Merc guy, you wouldn’t want to harm such a nice engine.