your oil pump is located behind the lower timing cover. to replace you will have to drop oil pan pull crank gear off and then lower timing cover
You probably need to drop the oil pan down, remove the front cover and replace the cover gasket and main seal.
Replace The Timing Cover Gasket
The oil pump is in the timing cover and is driven off of the crankshaft snout. You have to remove the timing cover to replace it.
In order to replace a timing chain for a 2003 Chevy Cavalier, a person will need remove the oil pan, crankshaft pulley and hub, timing cover bolts, and timing cover. Then the timing cover gasket, timing cover and bolts, crankshaft pulley, and oil pan will need to be installed.
remove timing cover remove oil pan and oil pick up pull timing belt and replace oil pump and gasket. reinstall
you have to take off the timing chain cover and replace the seal in the timing chain cover as welll youll need the oil pan seal
It can get in through the timing cover. That does car does not have a "timing belt" cover, but it has a "timing chain cover." There is a BIG difference, as a timing belt cover does not have coolant and oil running through it, but a timing chain cover does have both coolant and oil running through it.
The oil pump is located in the timing chain cover. If you are going to replace the oil pump, it is strongly recommended that you purchase a new timing chain also. Saturn sells a kit which includes both the chain and the oil pump. Once you have removed the timing chain cover, the oil pump can be removed using a number 30 Torx driver.
I've done it both ways, leaving the oil pan on or removing it. Removing the pan is probably the best way to insure a clean leak free job. Leaving the pan in requires some trimming of the timing chain cover, loosening the front of the oil pan, finesse and plenty of RTV sealant.
What is a oil cover
I have the same problem with the same vehicle, the oil pump is on the inside of the timing cover. good luck