You would need to drop the oil pan and remove the oil pump to gain access to the intermediate shaft.
It is inside the oil pan. There is a shaft that connects the oil pump to the bottom end of the distributor shaft. The cam shaft then turns both of them as it rotates. You'll have the remove the oil pan to get to it. I hope that this helps.
Depending on the engine: (According to Haynes Repair Manual) 3.0L - the oil pump is located in the oil pan. You'll have to remove the oil pan, then the oil pump mounting bolt. Lower and remove the oil pump assembly (the oil pump intermediate shaft will come down with the pump). 3.8L - The oil pump is mounted in the oil pump cover/oil filter adapter. The oil pump intermediate shaft is mounted to the timing chain by a clip (I have a 3.0L, so I haven't seen this). You'll have to remove the oil filter, then the oil cooler assembly. Remove the oil pump/oil filter adapter from the front cover (inspect the oil pump gear pocket). Remove the oil pan, the pickup tube bracket nut, and two mounting bolts to remove the oil pump pickup, then lower and remove the pickup. This is probably more info than you wanted, but there you go.
The oil pump is driven by the distributor shaft, with an intermediate shaft in between. There is a plastic coupler between the oil pump shaft and intermediate shaft. You could take out the distributor and put an oil pump primer shaft down in there and spin it with a drill to see if it's all connected and working properly. If no oil pressure with a drill, the problem could be that the pickup tube has broken or fallen off the oil pump or the bolt that holds the oil pump to the rear main cap is loose (not common). The solution would be to remove the oil pan and replace the oil pump and pickup. If the engine ran without oil, you may need to check the condition of the bearings.
Remove the throttle body and loosen/remove fuel lines. Remove single bolt and bracket for oil pump shaft and housing. Using pliers pull straight up on the shaft. You may have to wiggle it a little. Remove the old seal, install the new and reverse procedure. It's a fairly easy job.
Pull the radiator shroud, remove the serpentine belt, remove the fan from the water pump shaft, then remove the water pump.
Plugged oil pump screen,plugged oil pump itself, broken drive shaft for the oil pump ,broken drive coupler for said pump. no oil in oil pan .plugged oil passages in engine block.
Remove the oil pan, remove the pump, and replace it.Remove the oil pan, remove the pump, and replace it.
The water pump is driven by the oil pump shaft - there is a tab on the end of the oil pump shaft and there is a groove on the water pump which sits into that shaft. All shafts end up being driven by the motor.
you can replace power stering pump without moveing drive shaft but its fiddly. to remove drive shaft undo 30mm nut in centre,undo bottom ball joint and pull strut out of way be ready to catch gear box oil.
Shaft from distributor could be stripped or the screen on oil pump my be clogged but most likely its the shaft coming from pump to the distributor is stripped or broke
Remove the oil pan. The oil pump will be visible. Remove the oil pump pickup to. Remove the oil pump retaining bolts. Reverse the process to install the new oil pump.