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Oil leaking from pump

I have a 10 year old Generic pressure washer - 2000 psi. It gets maybe 3-4 hours use each year. On top of the pump is what looks like some sort of brass pressure relief port. This past weekend I noticed a mix of oil and water spraying out from this port. I shutdown the machine immediately and checked the engine oil level (which looked fine). Quite a bit of oil spilled out onto my driveway. I really do not know if this was engine oil or pump oil that was leaking. Can anyone please explain what may have happened and what my options are? Thank you in advance for your assistance. Mark

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  • mjh8666 Apr 21, 2009

    Thank you Bill for the feedback. What I subsequently discovered is that this pump has a history of this exact failure. Apparently the plating on the pistons have failed and rust has developed on the pistons as the washer sits in my garage all winter long. As I start up each spring the rust eventually wears away at the oil seals, causing a rush of high pressure water to enter the oil chamber. The chamber fills up until the oil/water spray from the breather vent. This issue combined with the intermittent issues with the high/low pressure regulator has caused me to decide to replace the pump with a quality pump that has brass water manifold and ceramic coated pistons. Thank you again for the timely information. FYI - my pressure washer is a Generac 1292.



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Top is a breather you may be overfull of oil most pumps you can use engine oil .drain and put in half litre or if it has a sight glass top up to low side of glass and try it out.possible your seals on way out this usually then leaks at front or gets water in.if you still have good pressure oil seals easy to do.

Posted on Apr 21, 2009


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