Posted by Tom Fleming on April 30, 2010 at 03:59:22 from (67.20.229.132):
In Reply to: cub smoking posted by aldrman on April 29, 2010 at 07:57:22:
Well, it could be a number of things. Valve guides, stuck rings, broken rings. Most likely, the rings are stuck (or at least some of them).
The suggestion to work it for awhile is a good one. Everyone has their own preferred product for situations like this, and ask 10 people, and you will likely get 10 different answers.
Fresh oil change is a start. If I were working on this one, I would put a small bit of either PB blaster or Marvel Mystery oil into each cylinder through the plug holes (about 1/4 cup), and turn the engine over slowly without the plugs in (with hand crank if you have one. This will coat the cylinders and distribute the penetrating oil). Then I would leave it sit for 1-2 days. Lastly, I wold start it up and run it. Work it. Get it up to temp, and keep working it. When you first start it after putting a penetrant type oil in the cylinders, it will really smoke at first until all the penetrant burns off.
If the rings aren't broken and just stickly that will help clean them up. Valve guides are unlikely, but not impossible. These are valve in block engines, and oil consumption through worn valve guides is less of an issue than valve in head engines.
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