Timing marks 320 mercedes benz car engine ,year 1994 ,need information and how to time the engin

This is an easy one to time. the timing mark for the crank is 0 degrees-do not attempt to tum crank if cam timing is out. there is no distributor on this engine-it is advanced with your intake camshaft. The intake camshaft is the only tricky part to time. Be very careful because at 2500 rpm this cam actually moves forward via cam advance solenoid. It will hit your crank if not timed properly! so with your crank at o degrees-camshafts out of head if you need to turn engine to line up crank-on the exhaust cam(your left)behind the gear(on flange) there will be a hole big enough to put a small punch in that will line up with the top of the deck surface on the outer side(to the left). Now on your intake cam(your right) it will be just the opposite. the hole on the back side of the gear flange will line up on the right with the to p the deck surface. once in line hold intake cam and turn the gear(advancer) all the way to the right)-very important. You will have to start with you intake(put chain on) then line up your exhaust and install timing chain tensioner. always turn engine 360 degrees and recheck before you proceed. At least your at top dead center and you can visually see the lobes on both cams mostly straight up. hope I have been helpful.