Patent ID: 9701384
Date: 2017-07-11
CPC Classifications: B63H

Claim:
1. An outboard marine engine comprising an internal combustion engine; a cooling water circuit that supplies cooling water for cooling at least one component of the outboard marine engine; a syphon conduit connected to the cooling water circuit and configured to syphon the cooling water from the cooling water circuit when the outboard marine engine is not operating, wherein the syphon conduit is coupled to the at least one component and configured so that when the outboard marine engine is trimmed up, all or nearly all of the cooling water is removed from the cooling water circuit by the syphon conduit, and wherein the syphon conduit is configured to first drain the cooling water from the cooling water circuit by gravity and thereafter remove the cooling water from the cooling water circuit via a syphon force; and a driveshaft that is driven into rotation by the internal combustion engine, wherein the driveshaft extends along a driveshaft axis, and wherein when the outboard marine engine is trimmed up into a position in which the driveshaft axis is set at an angle to vertical, the syphon conduit first drains the cooling water from the cooling water circuit by gravity and then removes the cooling water from the cooling water circuit via the syphon force.