2007 hpdi 225 overheated in grass

[opie1]

First day with newly rigged motor. I clogged the intakes completely with grass but I did not realize what happened until after I got back to the dock. The overheat warning blinker had been blinking from the first time I started it, so I did not think anything of it. The warning horn got my attention. One beep. I had no water pressure.
I turned it off, waited a minute and when I turned the key back on, before I turned over the motor, the horn was continuous. I pulled the cowl and burned my hand on both side of the motor.
I let it cool for twenty minutes, started it with no alarms and idled twenty minutes back to the ramp.
What's my next step? Can I just flush it and see if I have pressure again? Do I need to check for a burned up impeller? Are there more serious possibilities?

[Rich Z]

You should check the impeller and do a compression check.

[EL Skeeter]

If it indeed got "that hot." Have it checked out on the Diagnostics Computer for "Codes".
A motor overheating for a prolonged period of time can cause Serious damage.
HPDI 's are notorious for overheating with their Low Water pick-up.
My HPDI just smells hydrilla and it starts getting hot.

[opie1]

When I was doing the compression test, I got a constant alarm starting after the engine turned over and not stopping until I turned the key all the way off. Is this normal?
Compression was good, 118,118,118,120,118, and 118

[Charlie206]

Do you have the small lights on the dash for overheat and oil alarm indication? You certainly should not be getting a heat alarm on an engine that's not running. You may have melted the sending unit in the head.

[opie1]

Today I fished on the trolling motor, but started the engine to load the boat on the trailer, with no alarms.

I have the basic digital tach, (not the command link), and the temp warning bar blinks all the time. It blinked all day the first day I had it. The oil indicator on the tach is supposed to show three bars, full, medium and almost empty, but when I turn the key on only one bar blinks for a second or so and then goes out. My not understanding what exactly is going on with the gauge is partly why I let the engine get hot enough to set off the alarm. I kept checking the tell tale and thinking it must be getting water. Now I know better.
I am going to order a water pump, and new plugs, now I'm wondering if I'll need to add more to my order.

[opie1]

The sending unit in the head I may have melted, is that the thermosensor assy?