Cylinder Wall Glazed

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Sean

I need some opinions on this. My Yanmar YSE12 is burning lots of oil, and I do mean lots. About a quart every 10 miles. I'm sure the cylinder wall is glazed because I spent a lot of time running at low rpms this last spring salmon fishing. Anyway, I was thinking about pulling the head, spraying the rings with WD40, letting is sit a few days, move the cylinder up and down by hand, clean up the pison,clean up the head and finally honeing out the cylinder wall. I was thinking this may reseat the rings and eliminate the problem. Otherwise, the engine runs perfectly. Anybody tried this or have a better idea? Thanks, Sean
 
J

J. Tesoriero

Check the Archives

There have been several posts over the past year or so with advice on oil-burning engines. Before you tear down your engine you might want to consider some less invasive method. There has been more than one suggestion to replace your crankcase oil with diesel fuel and run the engine for a while with no load and then flush and replace the oil. Another has suggested using a crankcase full of Marval Mystery Oil. Call Yamnmar and ask around some of the diesel shops for advice.
 
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Bob

Sounds like stuck rings

to me. Before I would do a tear-down I'd run a can of Sea Foam through the fuel system and put another can in the crankcase. It really penetrates and cuts through varnish, gum, and gunk.
 
L

larry w.

burning oil

Sean; I would take the boat out and run the engine hard for a while, keeping an eye on the oil level and top up as necessary. That may remove the glaze on the wall. It might take a season to work, but you'd increase the life of the engine. IMHO, additives are for the most part totally worthless.
 
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Mike

Oil Burner

First things first. Are you sure you are burning it? A quart in 10 miles is VERY high consumption. Check for leaks inside the boat and also see if you are leaving an oil slick behind you when crusing. A cylinder head thats not properly torqued can allow oil into the cooling jacket. The first thing to do is a compression test. If your compression is OK, then the problem is more likely a gasket, seal or something as mundane as a valve stem seal. Glazed cylinder walls are seldom the cause of this kind of oil burning. If its going into the cylinders, you should be putting out blue smoke in the exhaust. If the rings are stuck or collapsed, then you should be getting a lot of gas blow-by in the crankcase and it should be evident by an oil spray or film on the engine itself. Don't assume untill you run a compression test. First things first. Mike
 
S

Sean

Thanks Mike

The engine is smoking a lot, but not really leaving a slick behind. I'll do the compression check next. Thanks, Sean
 
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