How to flush a volvo penta boat motor

Written by will charpentier
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How to flush a volvo penta boat motor
Volvo makes more than a well-mannered automobile. (volvo xc 70 image by Harald Soehngen from

While there are many ways to flush a marine engine, Volvo Penta engines have a built-in "engine flushing port", a dedicated hose on the motor that allows you to connect a common garden hose directly to your Volvo Penta's cooling system. The system is no-nonsense and straightforward. You don't need hose adaptors, flushing attachments with cutesy names like "ear muffs", parts that are "available at extra cost" or special tools. You just need a garden hose.

Skill level:

Things you need

  • Water spigot
  • Garden hose

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  1. 1

    Connect a garden hose to a water spigot.

  2. 2

    Look at the starboard rear side of the engine--the engine's right side, as it's mounted in the boat--and locate a hose that's clamped there, identifiable by a blue cap over its end and the "running engine flush" symbol, which resembles a water spigot above a stylised representation of a motor. Take the blue plastic cap off the end of the hose, called the "engine flushing port", to expose the flush connector.

  3. 3

    Screw the end of the garden hose into the flush connector. Turn the water spigot on, full force.

  4. 4

    Start the engine and allow it to idle until its temperature finally climbs into normal operating range; the thermostat won't open to allow fresh water to circulate through the engine until it reaches this temperature. Let the motor continue to run for at least ten minutes.

  5. 5

    Shut the motor down when it's flushed out. Turn off the spigot, disconnect the garden hose from the motor and replace the blue cap on the engine flushing port.

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