Turbo is not cutting in on cummins diesel boat motor?

Question

any ideas as to why the turbo is not working. It has just been fitted (brand new turbo) but is not cutting in when increasing speed.

Answer 1

could be a problem with your injectors

Answer 2

The turbo on a Cummins does not have a waste gate and does not "cut in" as you put it. What symptoms does your engine have? Does it have a lot of black smoke, poor acceleration? Just because you have a brand new turbo there could be other problems. The turbo could still be bad, not installed correctly (v-band torqued wrong), the exhaust could have a restriction, the air intake could be restricted, the prop or shaft could have something on it creating an overload for the engine.

Answer 3

some cummins engines do have a wastegate,i suggest removing the intake hose from the turbo and seeing if the impeller is spinning if the turbo wasnt prelubed it could be seized up