Drain Plugs

It's possible that the impeller of the seawater pump will become damaged due to overheating. Right Side Engine Block Drain Plug in Figure 11-10 When flushing, don't rev the engine higher than 1500 RPM. The following must be present on the manifold if the radiators are connected to one that is welded to the tank: removable end plates, a drain plug, and an air entrance vent. If the manifold is removable, it must be equipped with all fittings and lockable, tank-indicating gate valves.