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

Get Your Car Fixed at a RepairPal Certified Shop.
We certify shops based on expertise, quality work, and verified customer reviews
1 answer
if water pump is visible noisy and leaking coolant down below the water pump hole.