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How should you clean out the old oil sludge and residue from the crankcase of an engine that has been sitting for a year?


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Wiki User
2015-07-15 19:14:04
2015-07-15 19:14:04

Change the oil and filter and let the engine get up to operating temperature. Replace the oil and filter again if it shows signs of dirt. if possible get one of those magnetic oil drain plugs that will pick up metal particles from the oil.

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no, the oil is mixed with the gas before it goes in the carb, so there should never be oil sitting in the crankcase.

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That is a two cycle engine and should not have a crankcase oil capacity! It should be oil injected with a reservoir jug under the hood, with should have a level line on it.

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Vacuum should always be present in crankcase, it is provided by the PCV (positive crankcase ventilation system) pressure is what you don't want to see.

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If there is any residue on the spark plug, it will not produce a sufficient spark for the engine ignition.

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No, but your crankcase should be vented anyway. If your getting coolant in the crankcase it is getting in from a bad head gasket or cracked head or bad intake manifold gaskets. If you don't fix it soon your engine will be toast.


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