Did you remove the water line that runs across the front of the engine? Or is that bolt 10 mm.

Anyway, check the heater hose connection at the rear of the head -- it's sealed with an o-ring and held in place with a metal clip, and the o-ring goes bad and dribbles.

Did you replace the short hose between the water pump and the thermostat housing? If not, you need to, it's likely to be bad.

The sealing surface for the water pump must be completely clean, so must the groove in the pump, and you should not use oil or grease on the o-ring, else it dribbles.

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!