Yanmar 2gm20f alignment

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Jim Grant

Ok here’s the situation. Last year I decided to have my cutlass bearing replaced, it really needed it after 11 faithful years of service. A local yard in Deltaville VA did the work. The yard sup. told me that in order to change the bearing they would either have to drop the rudder or remove the strut. He suggested removing the strut and proceeded with the job. Of course as luck would have it the suggested that I replace the strut due to electrolysis damage. Apparently it was slightly brittle and somewhat pink. Anyway, they completed the job and everything seemed pretty much fine. Here’s my question finally. The boat is currently on the hard and like a good boat owner I’ve been inspecting every nook and cranny. What I noticed is that it appears that the brand new cutlass bearing is not wearing evenly. It has worn down more on one side than the other. Actually when I look at it facing the bow it has worn more on the starboard side and when I inspect the bearing facing the stern it has worn more on the port side. Does it sound like my shaft is out of alignment? For the most part it was vibration free at most rpm’s anyway. How do I check the alignment? Thanks in advance.
 
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Pat McCartin

Shaft alignment

Jim, I did the same service to my H30 last summer. Here's the bad news, you can't realign the shaft untill the boat is back in the water. The hull must be suported in it's "natural" enviroment to get proper alignment. Leave your shaft unbolted when you splash this spring, then take a set of feeler gauges and measure the clearance between the coupler halves. The clearance should be equal at 90 degree intervals around the coupler. Pat McCartin 1979 H30 "Therapy" Lake Lanier, GA
 
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