The good news is that checking the thermostat is often a quick and easy task. Here is a quick step-by-step guide to checking your thermostat at home: here
See full version: How To Check An Outboard Thermostat
The good news is that checking the thermostat is often a quick and easy task. Here is a quick step-by-step guide to checking your thermostat at home: here
If I were to ask you what the five most important things to check when servicing an outboard were most would rate a thermostat pretty low and some, in fact, wouldn’t even rate it. We are trained to think that the heart of the cooling system is the water pump and it should be checked and changed annually, and this is correct, but if the water pump is the heart of the cooling system then the thermostat should be considered the brain!
Working thermostat: A working thermostat should open as the wax inside expands from the heat of the water. If your thermostat appears to be working, clean any muck around where the thermostat seats in the block and re-install the thermostat with a new thermostat gasket. here
A thermostat is designed to hold the cooling water in the block until it reaches the temperature set by the engine manufacturer. Generally, this is between 50 and 60 degrees Celsius. It then opens to release the water before it gets too hot and overheats the outboard.
Because of the saltwater environment that most of us run our outboards in thermostats are susceptible to corrosion, salt build up (from irregular flushing) and sand build up (from beach launching or shallow water usage). These are the instances that can cause thermostat blockages and lead to your engine overheating. more
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