Flushing engine

[tcoat60]

I have a 2016 Crownline 255 SS with a 300 HP Volvo Penta engine with 20 hours. While flushing the engine the temperature came up to 144 degrees and stayed there for a while and then dropped to 0 degrees. The engine was not running hot, has anyone see or heard of this issue before?

 

[Scott Danforth]

how were you flushing it?

 

[tcoat60]

I was flushing it through the hose connection on the side of the engine. I have flushed it once before and the temp stayed at 140 thought the whole process.

 

[Lou C]

Either an issue with the sending unit or connection there, or the flushing unit is allowing air in, causing the sending unit to not read properly.

 

[DouglasW]

I can't envision this being anything but a problem with the gauge or sending unit. Zero degrees F wouldn't occur even with no water on the sensor unless you are in the arctic.

 

[BRICH1260]

I`d say a sending unit or gage issue. I`d start it up again and see what happens, monitoring the block temps with an IR temp gun. If temp gun indicated the block and manifold temps are steady, then it`s the sender or gage.