cover plate on engine block neap water pump

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Thought I had blown a water pump on my 1989 pont. grand am. This has the 2.5L engine. Upon closer inspection I found the leak coming from a cover plate just aft of the pump held on with 4 bolts and the bottom one was loose! when I removed the plate I exposed a 4" opening in the water jacket. My question is: What the heck is this thing, why is it there and what is it's purpose?

posted by  freebird5850

Its a relic of the manufacturing process and very usefull if you have to descale your engine.

posted by  cinqyg

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