How do I know if my engine is salvageable?

[Edgeplus]

If coolant has entered the oil, but the Edge still starts/runs (a little rough), does that mean engine is still good and replacing water-pump is advisable?

[TourGuide]

I'm afraid it is done. You are on borrowed time. You should either start looking for a re-man unit, junkyard special, or a new motor.

[WWWPerfA_ZN0W]

Hard to say. If you noticed it right away and did not drive it after that? Redemption is possible. But if it turned chocolatey and/or sludgey, you will definitely be flushing for a long time, and would be better off with a rebuild, or a "new" engine given time & expense. Depending on mileage of the "new" engine, would perform the water pump replacement on that as well just to tick that box.

[autom8r]

As soon as water enters the crankcase, electrolysis begins. Modern engines use a variety of dissimilar metals as bearing surfaces. In oil, galvanic corrosion between these dissimilar metal surfaces is slowed way down or arrested. In water, galvanic corrosion will most likely damage the bearing surfaces of the engine parts where dissimilar metals come into contact with each other, crankshaft to connecting rods, connecting rods to wrist pins, etc. Even the seals and guides may be affected.

 

Regretfully, you are against the clock. As the engine sits, water is beginning its demise. A week, probably recoverable. A month, could be trouble.