Should I routinely replace the impeller in my Mercruiser outdrive as preventive maintenance?

If so, how often? It is a 1978 Type I

Answers:

Most manufacturers say once a year or after a long period where it could have a chance to dry out. If you notice the motor overheating shut it down, could be a sign of impeller failure. Repairing the engine can be significantly more costly than replacing the impeller regularly.

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