Can't think of an external oil pump on a Transit or what model you are on about, do you mean the viscous fan coupling? The earlier Transits ie. 2.5 di were a l/h thread and the newer 2.4 duratorq a r/h thread,there is a special tool/spanner for removing them,you can't get a bearing for them, just replace the whole assy.
cdc, January 2015