Originally Posted by atoll
the lower sender is the standard yanmar sender for the ysb 8/12.
which closes the circuit at ~50 degrees celcius activating an alarm
and warning light, indicating overheating
the upper is just a temp sender,and non standard.
as others have said it should be plumbed directly into the coolant chamber to be effective.
workshop manual here;
50degrees Celsius is only, 122 Fahrenheit that's not overheat temp.
However it's a seawater cooled engine
, so I think the temp sender is adequate.
You really don't want much temp, as salt
comes out of solution in higher temps, below 140 Fahrenheit is adequate.
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