Oil Foaming

Question: What causes the lubricating oil in my vertical motor to foam?

Answer: Oil foaming is generally caused from moisture contamination, cleaning solvents etc. that get into the oil. The contaminates tend to discolor the oil giving it a milky appearance and the bubbles will dissipate very slowly after the motor has stopped.

The primary method of correcting foaming is to have the oil reservoir and associated parts thoroughly steam cleaned and baked dry. The main emphasis is to make sure all contaminates have been removed and the reservoir is completely free of moisture. If the issue still persists, anti-foaming agents are available as an additive to stop the foaming

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