Water contamination in my LeRoi Dresser 500 oil.
There appears to be water contamination in my LeRoi Dresser 500 oil.
I have an older LeRoi Dresser air compressor with a Dresser 500 2 stage pump. I only use it occasionally to run my sand blaster.
I have a smaller Speedaire compressor for shop air.
I went to use it yesterday and checked the oil. The oil was the color of honey mustard dipping sauce (originally it was a light honey color). I drained it and flushed the case with kerosene then used shop air to blow out any remaining kerosene. I refilled it with Valvoline 30 weight non detergent oil. Then I ran it for 3-4 hours while I used the sand blaster. I occasionally had to allow the compressor some time to catch up.
I noticed that water was dripping from what I believe is a pressure relief valve on the line going into the high pressure piston. When I was done for the night I let the compressor cool down and checked the oil. It looked like dipping sauce again. I drained it and flushed with kerosene again. This time some black chunks of stuff came out too. When I drained the tank approximately 4-5 OZ of water came out. It was pretty humid yesterday with temps in the high 80's.
Is this amount of water/condensation in the crankcase indicative of piston ring failure? Is this pump generally worth rebuilding ($300 in parts) or should it go in the next scrap run?
Thanks for your time.