That shaft has a large drive gear attached to it inside the timing cover,the shaft is tapered and keyed to the gear and held secure with a nut,the cover directly in front of the pump has to be off to undo the retaining nut and a puller is needed to break the taper,if you jumped a gear you will have to get it back,to check there is a timing hole behind the starter motor on the bell housing,remove the plug and line the 8° mark before TDC on the flywheel with the pointer,the engine needs to be on compression stroke on #1 cylinder,ie both valves closed on #1, the match marks in the pump should now be lined up if the gear has not moved out of time,if it has moved it will need to be moved back,there is marks on the gears but they can only be seen when the cover is off.the easiest way to change those pumps is line up the match marks in the pump before removal.do the same with the replacement and the timing will be right providing the engine has not been moved.
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