I'm trying to choose a DTI which I can use to find TDB on my om603 engine. The head is installed and I think I fouled up setting TDC when I put everything back together. My hope is to remove the #1 injector and the precombustion chamber so I can insert a TDI to pin down exactly (or as closel to exact) TDC.

From looking around the net - I thought I wanted the Starrett 196, but after looking more closely at that one, I don't think it'll work. The lever on that one looks like it is on the back of the dial. What I need in one with a long stem that will reach down thru the injector port. One that I can clamp in place - probably the kind that has a little pivoting finger. Since I am not actually interested in a measurement value per-se, only the movement of the piston, there is no need for a calibrated / certified uber-fancy tool. I even have thought I could maybe use a long wooden dowel which I could watch closely as the piston moves up/down?

Anyone have a suggestion? I am hoping to find one used.

Thanks to all for the advice.