my starter motor decided to give up the ghost on my 200 tdi after goin in a lot of water . so i changed it for the one off my old td engine which was fine back in the summer. well the td starter does work but it makes like a loud grinding noise. but NOT a metal on metal grinding noise . until the engine starts then its fine. being a tdi it dosent take much cranking to start but the noise dosent sound healthy . could it be a bad earth from starter to chassis causing it IE THE STARTER ISNT GETTING A PROPER CONNECTION I DONT KNOW. any one care to enlighten a novice