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Outboard 101

Mercury 115 XL Impeller or Full Water-Pump Kit?

Quick Answer: On the Mercury 115 HP FourStroke XL gearcase covered here, remove the trim-tab anode first because it hides an additional lower-unit bolt. After the gearcase is supported and...

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2017 Mercury 115 Water Pump Service at 300 Hours

Quick Answer: The 2017 Mercury 115 HP 2.1L FourStroke reaches a scheduled water-pump service point at 300 operating hours or three years. A complete service replaces the impeller and inspects...

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How to Remove a 2019 Mercury 150 Lower Unit Safely

Quick Answer: To remove the lower unit from a 2019 Mercury 150 FourStroke for water-pump service, secure the boat, place the control and gearcase in the service-manual position, support the...

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How to Replace a Mercury 150 FourStroke Water Pump

Quick Answer: Replace the water-pump impeller on a Mercury 150 FourStroke by supporting and removing the gearcase, dismantling the pump in order, matching every gasket and wear-plate passage, locking the...

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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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