It is critical to keep the bilge in a tow-sports boat as dry as possible. Engines in tow-sports boats are mounted very low making water in the bilge a serious problem. Please refer the following diagrams for 5.7L GM, 6.0/6.2L GM and 6.2L Ford models to relate water levels in the bilge of the boat to possible engine, transmission and component issues.
5.7L GM Port Side View –Water Intrusion Levels
E. Crankshaft pulley in water. Water gets pulled up by serpentine belt and splashes water on front of the engine. Output shaft of v-drive in water. Possible water intrusion in v-drive.
F. Base of dipstick tube in water. Possible water intrusion. Engine and transmission mounts compromised
G. Flame arrestor in water allowing water to be drawn into engine through intake. Top mount starter submerged. Transmission and v-drive vents and dipsticks under water
H. Valve covers in water. Water flows through flame arrestor directly into engine. ECM and electrical box in water. Electrical failure to follow.
I. Because of the location of the flame arrestor, these engines are also susceptible to water intrusion from above. Wet riders entering the boat or rain water can easily be sucked into the flame arrestor when the engine is running
5.7L GM Starboard Side View