Re: Gray Smoke, Black Smoke
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Posted by Don Dixon on June 28, 1998 at 20:01:27:
In Reply to: Gray Smoke, Black Smoke posted by Robert Marzi on June 28, 1998 at 17:57:02:
Bob you were given good information only it is oil that produces blue grey smoke and too rich fuel mixture will give you black smoke.
Engine coolant leaks into the combustion chamber will give you steam which may look grey to you. especially when it is first started up, and sometimes the heat of the engine will seal up the leak but only until the engine cools off and then it weill leak again.
What you may have (hopefully) is just some condensation in the exhaust system. Due to the fact that it has not been run for such a long time.
If it is then it wil soon stop sending out the steam. If it is just a small amount of grey smoke (oil) then is it possible that it is oil that you put in the cylinders when you were installing the pistons?
I always get pretty free with the oil when assembling an engine because it has to lubricate a dry engine before the oil pump can build up pressure, and deliver it through the whole engine.
In any case all things considered, it is much preferred that you have a little oil smoke rather than steam of any considerable amount.
The next most common cause for oil smoke on a rebuilt engine is worn valve guides.(especially on older engines which dont always have valve stem seals. Hope I have helped DON
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