Does anyone have any idea why my new Geba water pump leaks at the o-ring? I followed Guenter's post on water pump replacement located on the Benz forum to the "t". I have taken the water pump out four times in the last 2 weeks and I can't seem to stop this leak. Each time I have changed the o ring, bolts and washers (4 each), and tried different ways of torquing the bolts. Am I tigethening the serpentine belt too tight? I replaced the tensioner, damper, and adjustment and made sure I set the tightness right to the notch on the scale. I am really tigthening the bolts down on the pump to the point where I'm afraid the bolts will snap if I go any further. Could it be a defective pump? Every time I take the water pump off, I immediately check to see of the o ring held it's position and in each case it has. I replaced the bolts because the ones that were on there were all bent, except for the allen bolt. Is there some sort of mechanic's trick that I'm missing? On the last attempt, I even put a little "super black" form-a-gasket in the o ring slot to see if would help and it didn't.
I'm ready to fly the white flag and bring the problem to a mechanic. Pleas help.
Thanks,
Gene