Temperature sensor

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Farandaway

Veteran Member
Joined
Jun 10, 2020
Messages
34
Location
USA
Can someone tell me where the water temperature sensor is located on a ‘77 MerCruiser 454? Thanks
 
A very long life for a gasser. I had the same engine, a rebuild but eventually it had to be replaced. Has your engine been fresh water only? There are three Virmilion's listed, Ohio, Michigan and Illinois.
 
I’m 99% certain it’s been fresh water the whole time. I think I’m the 4th or 5th owner. At one time it was registered in Kentucky but I do t think it’s never seen salt water.
 
It's either on the side of the cylinder head near the spark plugs, or the front of the intake manifold near the thermostat.
 
I know there's a lot of knowledgeable folks on here and I do appreciate the feedback but isn't there anyone out there that knows for sure where this temperature sensor goes? It's important for me to locate the old ones and replace them.
 
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