The Celica was a series of coupes manufactured by Toyota from 1970 to 2006. The GT was the base model of the seventh-generation Celica made from 1999 to 2006. The GTS was a sportier version of the GT. The engine in the Celica GTS was a four-cylinder, 1.8-liter engine with the oil pump mounted on the front of the engine. The replacement of the oil pump in this vehicle requires the removal of additional components to access the oil pump.
Position a drain pan under the oil drain and remove the drain plug with a socket wrench. Empty the oil into the drain pan and install the drain plug. Dispose of the used oil.
Disconnect the negative battery terminal with a socket wrench. This will keep you from inadvertently starting the engine during the oil pump replacement. Remove the timing chain and disconnect the sprocket for the crankshaft with a socket wrench.
Remove the mounting bolts for the oil pump with a socket wrench. Detach the oil pump and its gasket from the engine.
Clean the mounting surfaces for the oil pump with a shop towel. Mount a new gasket to the new oil pump. Install the oil pump to the engine and tighten its mounting bolts to 80 inch-lbs. with a torque wrench.
Install the sprocket for the crankshaft and the timing chain with a socket wrench. Connect the cable for the negative battery terminal.
Fill the engine with oil and start the vehicle. Check and repair any oil leaks.
