W126

91 350SDL -- HELP - dropped something into engine

This is a new car to me and I was replacing the glow plugs. To make it easier I removed the Intake Manifold on that engine since some of them did not have the 'proper' nuts on the bad glow plugs.

My mistake was to not cover the intake holes and I think something fell into....ALL THE WAY into the cylinder (past the valve). I have all the nuts and bolts that I was using, so I can't figure out what fell in. After I put it together I heard a metallic bang, bang, bang when I started the engine so I shut it down right a way.

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