You have a seal on the pump between the pump and the water pump thats leaking you have oil and water mixing . I owen three mechines and i don't understand what you mean when you say the oil filler stem. I also rebuild power washers and pumps. If you can clarify where the water and oil mixture is comeing out then i can tell you excatly what the leak is thanks
White smoke: White smoke is caused by water and or antifreeze entering the cylinder, and the engine trying to burn it with the fuel. If white smoke is present, check to see if the proper amount of antifreeze is inside the radiator and the overflow bottle. Also check to see if antifreeze has contaminated the engine oil. You can look at the engine oil dipstick, or look at the under side of the engine oil filler cap. If the oil is contaminated with antifreeze, it will have the appearance of a chocolate milkshake. Do not start the engine if the oil is contaminated with antifreeze, as serious internal engine damage can result.
It is also possible to be a engine problem you should immediate visit a car service.
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