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What I'm saying is extended Idle time is not good for diesels, you have to warm up your engine of course (at idle) once warmed up you are doing your motor no favors by idling for extended times.
Manufacturer says rpm 3400 then yes that's redline.
Generally 3/4 of redline is a good max "run all day" engine speed, tho nothing in stone that you MUST stay at 3/4...slow down and go 1/2 or 1/3 if you want.
Some engines will reach redline with full throttle, some won't it depends on your prop pitch/size.
Don't rev your engine to redline with no load.
Funny but it's my experience too that the more I rev the engine the faster my boat goes? who'd a thunk it?
Want your engine to last...then don't let it sit for months between start-ups, change your oil, keep a fresh impellor in it.
Duckhead
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