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Re: John Deere 4440 Turbo Issues
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Yes, the return tube is open.
I had read online that crankcase pressure can prevent the return tube from flowing on turbo applications. To test this, I ran the return line into a bucket instead of the oil pan. When doing this, oil was flowing fine through the return line, but was bubbling out of the oil pan feed thru that the return line would have went in to. So I unhooked the vent line coming off of the valve cover and the bubbling out quit, but the oil is still right there at the feedthru.
I would have expected that the oil would not sit at that feedthru. What would cause this? Is there somewhere other than the valve cover vent that I should check to make sure it is unclogged? How about the oil cooler? Is there anything there that can clog up and cause an issue like this?
Thanks in advance.
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