Detroit 11.1 won't turn over

Check your positive connections especially at the starter .. also maybe your starter has pretty much give up the ghost

 

Put a multi meter on the positive terminal of the starter make sure you have a good ground for your meter have somebody try starting it and see what the meter does if it drops voltage severely you have a bad connection if it stays about the same voltage when trying to start well more than likely is the starter
My friend @Rideandrepair is the Detroit Guy he can help you if it’s the starter

 

Yes, check wiring connections. I had the main ground from batteries onto the frame get rusty under the bolt and cause a dragging starter.
Also had a wire crimp connector attached to the start relay on my firewall get so corroded that it broke off.
Seeing as it struggled to turn over I would look for a connection.
Once I did have a starter that had an internal bushing turn in the housing causing binding, but it would still clunk when I tried to start it.

 

Quiero actualizar mi detroit 11.1 y quiero colocar una 18 que requiero hacer? Ya actualice de ddec 2 a 3. Cambie turbo sin valvula a valvula. Ya estoy esperando que me llegue mi intercooler mas grande. Esta en 400hp y 1450 lb.pie. pero quiero poner una 18.