How do you replace a oil pump on a 1991 grand am?
Replace or rebuild the engine. In all but the most obscure cases, low oil pressure is caused by worn bearings. Replacing the oil pump won't help.
If the oil is full but the valve train is dry and noisy on a 1999 Grand Prix should you replace the engine or change the oil pump?
You need to follow the same procedure as for timing belt replacement. But in the case of the oil pump you have to remove the oil pan too. There is a strainer attached to the oil pump from the bottom you will have remove it too. Then replace the oil pump, make sure that you have replace the oil pan gasket, and oil pump gasket.
first thing that you do is tame off the timing belt cover. then you remove the timing belt. there are two components on the engine that are driven by the timing belt the lower one is the oil pump the upper one is the water pump then you locate and remove the bolts for the water pump. pull the water pump off then replace with new water pump and gasket.
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.