Timing M104 Cams (1996 E320)

I lost cam timing when replacing a leaking head gasket on my 1996 E320 (M104). While no CD has been released for the W210 series, M104 was also used in the 124 series and the procedure described in the 124 CD is the same for M104 as that specified in Alldata. Specifically, basic cam timing is set with cylinder 1 at TDC, the variable timing on the intake cam set at full retard, and 4mm pins stuck through the holes in the cam sprocket to align the hole with the top of the cylinder head.

I do this but I am experiencing resistance after I rotate the engine about 30 degrees. It feels like a piston is interfereing with a valve. Does anyone know of a revised or alternate procedure to time cams?

Of some interest, the engine is described as non-interference at 30 degrees BTDC. Should cams perhaps be timed at 30 degrees BTDC?