I have a 1987 Benz 300 SDL, with the 6 cyl 3.0 Turbo Diesel motor. I recently started having trouble with the car and it turned out my turbo was seized so I put in a used turbo. The car started running better for about 20 minutes then as I pulled into my driveway I noticed that it was pouring oil out of the front of the motor, I assumed it was coming from the front crankshaft seal. After I pulled everything apart I realized that the seal was fine but directly underneath where the crankshaft comes out there is about a 1 inch by a half inch hole in my timing chain cover. I have a few questions, How difficult and what does it involve to change the timing chain cover? Also what are the chances that the piece of metal fell into the motor? And how would I check to see if the piece did fall in? Any advice is well appreciated, Thanks.