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Old 14-06-2015, 09:02   #1
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Chemical treatment for cylinder glazing?

I'm about to go into the boat yard to replace my SD40 sail drives. While I'm there I will have the injectors out of my yanmars to get them serviced. My engines have burned excessive oil since I bought the boat. Since the engines start on the first turn even in cold weather I doubt there is anything seriously wrong with them. The PO used to charge his batteries with the engines rather than the Genset and I imagine the cylinders got quite glazed from s doing so. After reading a bunch about the problem the prevailing opinion seems to be that oil residue on the cylinder walls is the most likely cause of the problem. Does anyone know of a chemical treatment I might pour in the cylinders while the injectors are out that might remove this residue? I can buy a lot of oil for the price of getting the cylinders honed but a chemical treatment might just be worth the effort. FYI, I use about a quart of oil every 16 hours at 85% rpm and maybe a quart every 30 hours at 66% rpm and have done so for the pat 9.5 years.
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Old 14-06-2015, 09:29   #2
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Re: Chemical treatment for cylinder glazing?

Bill, that is a lot of oil to be burning but you are just guessing at the cause. It would be worthwhile, IMO, to pull the heads and check out what the problem really is. First do a leak-down and compression test. Those tests will give you much more information than guessing. Could be rings, could be cylinder glazing, could be leaking valve stems. That's my opinion.
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