No, not a soda stream, a new water pump that fails in short order.

Been getting an intermittent sound from the front of the engine. From inside the cabin, this sound is faintly noticeable at startup. I'd describe it as a high pitched jingle bell. It usually abates after 4-5mins of idling/slow driving. Much more noticeable from the front of the engine, where it sounds more like a tin can with a pebble in it. Because of the timing, I had suspected an alternator bearing, but managed to pinpoint the sound to around the water pump.

Thing is, the water pump is a brand new, MBZ unit I installed last September.
It's probably seen about 15k miles since?

Anyone else ever experienced a water pump failing in such short order?
Is there something else I might be missing?

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1981 240D 4sp manual. Ivory White.