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Outboard 101

How to Replace an Older Mercury 90 HP Water-Pump Impeller

Quick Answer: Replacing the water-pump impeller on an older-style Mercury 90 HP gearcase requires supporting and removing the lower unit, lifting the pump cover from the driveshaft, preserving the impeller...

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How to Replace a 2015 Mercury 90 HP FourStroke Impeller

Quick Answer: On a 2015 Mercury 90 HP 2.1L FourStroke, replace the impeller by removing the propeller and all gearcase fasteners, lowering the lower unit without disturbing the shift position,...

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