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Whalers don't need much maintenance.

If your motor needs maintenance, then the best place to go in your case is a Mercury dealer.

The Steering is most likely made by Teleflex.
There is the Helm unit, steering cable which is then attached to the engine.
You could also have hydraulic steering which would have hoses instead of the cable.
Which one do you have?

Bilge pump is basically the same as a sump pump.