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  • Run
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  • Set
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Question

Mercruiser 350 Horizon MPI - How to properly flush Engine of Brackish salt water while in boat slip

Submitted: 21 days and 5 hours ago.
Category: Boat
Value: $28
Status: CLOSED
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Optional Information

Make (of engine): Mercruiser
Model (of engine): Horizon MPI
Year: 2003
Horsepower: 300

Already Tried:
Remove from water and backflush through outdrive intake ports

Accepted Answer

Hello. You have probably already found the simplest way to flush - simply use a set of "bunny ears" with a fresh water hose. Attach the ears to the outdrive and run the motor at idle with the fresh water running. Make sure the motor gets to normal temperature so the thermostat opens. Alternately, there are kits available that can be installed on the motor that provide a flush fitting that you can simply connect the hose to directly - same idea, just easier to do since you don't need the "ears".

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Expert: Captain Dave
Pos. Feedback: 98.5 %
Accepts: 
Answered: 11/2/2009

Marine Mechanic

USCG Licensed Captain, 20+ Years Boating, Fishing, Maintenance and Repair Experience

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