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I'll add my 2 cents to the fray. My '85 240 and my wife's '87 740 have the same B230F engine and matching water pumps. Both had the "green dribbles" at the pump area, mostly from the top pump seal at the head. If there's no coolant running from the weep hole at the shaft, it's not the pump. The pump's fine. I found that locally, parts stores only have the seals with the replacement pumps. Went to the dealer and got the 3 seals each pump takes and replaced them. They were $38 for 3 but worth it. As other posters have said, the mating surfaces are critical. I made sure they were clean and added a thin coat of Permatex HiTack to hold them in place during install. Plus it added a measure of extra sealing. The upward pressure with a prybar on the pump to press the top seal against the head is critical. That was over a year ago and many miles and no "green dribbles". I learned this lesson the hard way. Bought the 240 in '99 and it was leaking the same way and had someone replace the perfectly good pump. That pump's still fine with the replacement seals. The car has 235K and the 740 has 185K and both are leak free, at least water pump wise! If you still have your replaced pumps and didn't have to turn them in for a core charge, keep them. They're probably still good.
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