What is normal temperature 3L Volvo Penta?

[boatdude100]

I've searched and just can't find a straight answer.

What temperature is "normal"?

Mine is running 180 deg at plane (according to gauge)
2007 with I assume.. 160 deg thermostat
New to me boat with Impeller I suspect has never been changed
Thanks!

 

[Scott Danforth]

ignore your gauge as they can be very inaccurate

use an IR thermometer. check what temp you are at. you also need to know what thermostat you have.

assuming a 140 degree thermostat, some parts of your engine will be about 150 degrees, some about 90

assuming a 160 degree thermostat, some parts of your engine will be about 170 degrees, some about 100

 

[boatdude100]

I think this thermostat is supposed to be 160, Can I tell from looking at it what it's rated for?

 

[Lou C]

It should be a 160 stat. I never had a 3.0 but I have a 4.3 V6 Cobra with the same thermostat housing and exhaust design as the Volvo and it ranges from 160-175. If it is really hitting 180 that is a little too hot. Try taking IR temp gun readings on the stat housing or right where it bolts to the intake manifold. See what you get there.