At a loss for words...water pump

[BillC]

Since the hole is so close to the edge of the aluminum, recommend you consider using a Timesert instead of a helicoil. A Timesert is a hole-thread-repair part similar in concept to a helicoil, but it's a single "tube" of steel, rather than a long spiral. Timeserts also require a slightly smaller hole than helicoils.