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Q: Why would I have 3/16" axial end play in my crankshaft. on 2004 Volvo XC70

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This problem was uncovered due to the rear crank seal leeking. Once the timing belt and timing belt drive were removed I found the seal had been driven out of its seat an 1/8". I could move the crank shaft axially about 3/16", nothing radially. I then pulled out the oil pump and could see that the crank shaft had been rubbing on the oil pump housing. I then removed the oil pan and can see the starter ring gear is rubbing on the front of the engine block. Is there some spacer bushing that was not installed, I can't see anything in parts book. Why would the crank shaft move this much axially?
(1) Answer
There should be a thrust bearing for the crank shaft. Did you see bearing material in the bottom of the oil pan?

Zee