What are the signs of a water pump failure on 1994 Acura Legend

I have noticed black sticky drops on my garage floor and lite grey smoke coming out my exhaust once and awhile.
My car is a 1994 legend 6 speed coupe with type 2 motor

Asked by for the 1994 Acura Legend
1 answer
if water pump is visible noisy and leaking coolant down below the water pump hole.