Posted by Will Gumbert on June 16, 2013 at 14:24:42 from (22.214.171.124):
Recently, I replaced the power steering lines and while doing that I tried to get all of the old oil out of the system by jacking up the (wide) front and turning the steering wheel from lock to lock with the lines removed and the engine not running. I also loosened the belt and turned the pump by hand to get the oil out of it.
After putting the system back together and putting new oil in, I ran the engine with the new oil and lines and turned the steering back and forth and all seems OK but when I stopped the engine and removed the pump reservoir cover the oil looked foamy like this-
Eventually, the bubbles went away, I put the cover back on, ran it again, again turning the steering wheel back and forth and although there were still bubbles, it was not as bad.
Question is - Is the foaming normal, would it eventually quit, and what causes it? Pump cavitation? -Will
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