Marine engine mounts can make the difference between a low vibration engine, mounted stable in your boat or an iron monster that shakes the hull, produces noise and may lead to damage. Broken, damaged or worn engine mounts are not always obvious when 100’s of pounds of static motor are sitting on the mounts. Excess vibration can be caused by many things, including; mounts that are too soft or hard, worn engine mounts or how the mounts are attached to the bed. Of course, there are other things that can cause vibration, including; misalignment of transmission to shaft, worn components (cutlass bearing, transmission) or damaged components (propeller, shaft, transmission).The forces of a high revving, high horsepower modern marine engine are passed directly onto the engine mounts. Even small one cylinder diesels really pound the engine mounts. For all their apparent simplicity, engine mounts are subject to a number of forces:
- Longitudinal – The forward / aft motion of the engine
- Lateral – The side to side motion of the engine
- Vertical – the up and down motion of the engine
Most of these forces on a motor mount act in a form of chaotic unison. Not only must the engine hold its own position based on motor and transmission weight, but it also must resist the shearing force of the propeller under thrust. What looks like a simple job for an engine mount gets complex, quickly when throttling up; the engine mounts on one side are ‘stretched’, one the other side they are compressed, they are also subjected to shear by the thrust of the prop. Now add to the equation of a boat throttling up in rolling seas, or depending on the vessel, being subjected to storm conditions or high-speed pounding. The simple combination of metal and rubber that makes up an engine mount sees real abuse in a harsh environment.To know mopre go to our site
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