MERCURY MARINE MERCURY OUTBOARD (2-STROKE/4-STROKE) General Troubleshooting
System Nominal
The fluctuation in the telltale stream is a byproduct of the engine's thermostatic regulation. As the engine reaches its designed operating temperature, the thermostat opens to circulate water through the cylinder head jackets, which causes a momentary drop in the backpressure of the bypass circuit that feeds the telltale stream. This results in a visible pulse or change in the stream's trajectory which is a sign of a functioning thermal management system.
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