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Small Air Cooled Gasoline Engines

Engine crankcase flush


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  #1  
Old 04-03-2014, 08:28:02 PM
Mcgiiver Mcgiiver is offline
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Default Engine crankcase flush

I've been restoring old power equipment and always change the oil to full synthetic. Prior to the addition of new synthetic oil, I like to flush the crankcase, by running a flushing oil. Sometimes I use synthetic oil that has been run in my car, which is much cleaner that the gunk that comes out of small engines. Lately I have a mix of used synthetic from the car and new AT fluid. Most recent flushes have been with 50/50 mix of ATF and 10w30 conventional oil. Most times I just run the engine for a short period like while tuning the engine, then drain the flush oil and add full synthetic. Does anyone flush like this and what is a good flushing fluid to use?
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Old 04-04-2014, 03:47:01 AM
Roland Hayes Roland Hayes is offline
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Default Re: Engine crankcase flush

My flush preference is to drain down the old oil from a hot engine and allow to drip for an hour then replace the plug and pour a gallon of clean diesel fuel into the sump and let it sit for an hour rocking the engine back and forth occasionally if possible to make the diesel slosh around in the sump then drain off and inspect, I pour the diesel through a makeshift filter made up of a white cloth placed over the top of a funnel so I can see if there is any debris in it. I might do this several times until the flush diesel comes out clean. I do not run the engine.
I have a drum to store dirty diesel fuel and after settling for some time the fuel clears and I use it in my generator.
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Old 04-04-2014, 11:04:57 AM
Grape Grape is offline
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Default Re: Engine crankcase flush

Back when I was in Tech. School for auto mechanics my instructor mentioned flushing out old engines and he recommended waiting until the current oil was a qt. low and then adding a qt of ATF. He said the makeup and detergent in the ATF would loosen everything up. So based on this, I don't think your current procedure is probably pretty good.
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Old 04-04-2014, 12:12:23 PM
Mcgiiver Mcgiiver is offline
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Default Re: Engine crankcase flush

Added a 50/50 mixture of ATF and 10w30 or to a Briggs NP engine for a flush, ran for an hour and this gray mixture comes out. How does the ATF go in red and the motor oil go in clear amber and the result comes out gray milky looking mix?
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