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Old 07-20-2016, 12:19 PM   #21
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Originally Posted by tadhana View Post
Jay, in my many years running boatyards, I have aligned or been responsible for aligning hundreds of engines. I have seen bolts fatigue and fail. As recently as last fall I had a customer with a bad vibration, had 3 sheared coupling bolts. In all cases the engine was out of alignment. At 2000 rpm, the typical engine will endure about 4 million revolutions in an average year (round numbers) So in 3 seasons an out of alignment engine will pass 10 million cycles of loading and unloading. Coupling bolts do shear and alignment accounts for much of it.
I don't doubt that, but I can't believe an out of alignment condition of 1 or 2 thousandths would cause it. That is what I would call slight misalignment.
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Old 07-20-2016, 12:24 PM   #22
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It's not difficult to align an engine, just time-consuming and to an old fart like me, exhausting. Up down, back front, repeat until perfect. Also, an alignment done anywhere but in the water is a pointless exercise, the hull is loaded differently on the hard vs in the water; the hull flexes.
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