I've taken both the basic week and the advanced week at Mack Boring's union NJ facility, taught by their guru Larry Berlin. Each course was specific to your model of diesel, so the classes fill fast. Before taking the courses, I ordered the 'service manual' , the parts manual, and the engine install manuals for my particular engines. (far different from the tiny little book you get with your boat...) those books were invaluable as they even tell you what size wrench goes on the various fittings. (Then i haunted used tool depots til i had a complete set of what might be needed, including the 36mm deep drive socket for the p-shaft nut...) the parts manual was invaluable as they had 'blowup diagrams' to show how to assemble or disassemble a particular thing . (in my case, a freshwater feed pump and the impeeler for the r aw water pump, and the thermostat block, and the heat exchanger...) If you can't get into a course, get these books! then join boatdiesel.com ($35 a year) which has a yanmar board where you can ask questions about any kind of yanmar and get knowledgeable answers from excellent people. i needed to replace a whole propshaft on my yan, and redo the coupling from gearbox to p-shaft, and boatdiesel got me thru this project without any previous major - deconstruction experience and saved me about $4 grand and a summer on the hard. i might add that when i call to order a yanmar part, i have the parts manual in front of me so that i get the right part...
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