w126 wont start
 

I changed the water pump, and i had to remove the balancer. I placed back the balancer but its not reading '0' all i did was place the balancer make sure it was secured then bolted it back on --then i removed the front right spark plug i tried to poke a 6 inch plastic in there see if the piston was there or something or if the stick would dip in but it didnt dip in much so i took it as the piston was 'up' so then i check where that ignition wire for that spark plug when and aling the rotor straigh to it--it wasent off much at all probably like 1/5 of an inch. Then i try to start the car and i get no luck.....any ideas ?? did i check the whole piston thing wrong ? if so how do i do it ?! thanks for you advice!! btw this is for a 1980 500SE v8 mercedes benz!! greymarket!!

Thanks a bunch

how far was the marks off from TDC? Either your pump has the alignment peg in the wrong place, the crankshaft was rotated slightly, or (iff off more than 50-60 degrees) you have the balancer out of alignment (one hole is offset, so usually you will find that you have one bolt left over, because only 5 would screw in instead of 6).