Critique of the Mack Boring One Day Diesel CourseTaught at the Philadelphia boat show Jan 2005By James SeamansOpinions expressed are my own.The course was given from 10 to 12 a break then 2 to 5. Course materials are copies of copies of copies, somewhere around 20 generations, which at time was hard to read. Mostly diagrams of various Yanmar engines and systems. Though this course is geared towards diesels in general, Yanmar is what is discussed. Instructor is knowledgeable on all types of diesels and their operation. This course is for the individual who has NO idea what an engine is or how it works. The entire course can be done in three hours tops, the instructor wasted way to much time on history of diesels and stories and stories. Areas covered were, Basic Components, Basic Operation, Lubrication System, Fuel System, Cooling System and Electrical System. No specific information was given that cannot be found in the manual.Some tidbits given: Diesel fuel in the states is not the best; cetane levels are lower which in turn requires more fuel for the amount of power. Better cetane means better economy and more power. Instructor stated 99% of the time you will not know what the cetane value is at the marina (somewhere around 38). As for sailors we don?t use a lot of fuel just bumping around our local area. He recommended getting a couple of cans going to a truck stop (not the local gas station) and getting your fuel there; higher turnover. It will be cleaner and the cetane value will be on the pump and may be around 40-45 cetane. KEEP YOUR TANKS FULL as possible to prevent condensation in the tank. Could be right about this, I went from July to Nov and burned only 26 gals. After coming back in, top up your tank.Oil and filters, do what your manual states they have their reasons or design around it. For Yanmar, the oil has additives in it designed specifically for the marine environment and to use the CD grade or better called for in the manual. Filters, made an interesting point here. On the Yanmar, the filter is on the high pressure side of the pump and the filter is designed to take this pressure (about 120lbs/in). CHEAP insurance. Instructor would not state who makes the oil or filters for Yanmar.Engine smoking: White smoke ? water in fuel, cold engine. Blue smoke ? lube oil. Black smoke ? dirty prop or bottom, engine is working harder to push you through the water and wasting fuelMixing elbow has a life time of 5 years or less depending on how well you maintain your engine and fuel.Follow your periodical inspection and maintenance schedules. He stressed this to the point of nausea.That is IT - the whole course.One of the better pieces of advice was, find a diesel mechanic at or near your marina, bribe him with money or beer to show you how to change oil, belts, water pump, check the valves. Then start doing it yourself. (That is probably the two day course, $495)Epilogue:This course cost $125 which included four day ticket to the show. If you take it at their place it is $195. I for one cannot believe this course is worth more $50 based on what I saw and heard. A total waste of a day.Added after the fact. At this show they will give a 90 minute presentation that is basically the same information for free but will not count towards the two day course.