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Old 09-02-2016, 02:50 AM   #14
Larry H
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City: Pacific Northwest
Country: USA
Vessel Name: Jacari Maru
Vessel Model: 2014 Ranger Tug R-27
Join Date: Nov 2010
Posts: 359
Another possibility is that the coupler is worn out. If the engine has been out of alignment for any length of time the two parts of the coupler can wear. I had to replace my shaft and coupler at 5200 hours on my Tiawan trawler with a Lehman 120 in it. The new coulper and shaft had to be mated and lathe turned to square the coupler to the shaft. A dial indicator can show the runout on both the radial direction and the face of the coupler. The transmission half of the coupler is also suspect and should be checked.
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Larry H
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