There is a saying, "always learning". I thought I had my head around XU oil pumps, until today. I was asked to modify a T16 XU10J4TE oil pump. I never knew they were different. Look at the size of those gears on the T16 pump on the left, compared to an XU10J4 pump on the right. The pump body is bigger and longer. According to the parts book, the XU10J2TE has the same pump, 1001 66.