Tuesday, October 8, 2013
How to Replace the Water Pump on a 1997 Northstar Motor
The Northstar series of engines was manufactured by General Motors from 1991 to 2010. They are fuel-injected engines with double overhead camshafts. Northstar engines are most common in Cadillac vehicles such as the 1997 Eldorado, which has an eight-cylinder 4.6-liter engine. The water pump in a 1997 Northstar engine prevents overheating by circulating water and coolant around the engine. The procedure for replacing the water pump is generally the same for all Cadillac cars made from 1990 to 1998.
Instructions
- 1
Park the car, turn off the engine and open the hood. Detach the cable from the negative battery terminal with a socket wrench to avoid accidentally starting the engine. Position a container under the radiator drain and open the drain. Allow the coolant to drain into the container and seal it for later use. Close the drain.
2Disconnect the air cleaner with a socket wrench. Remove the mounting bolts for the water pump pulley, and detach the drive belt from the pulley. Disconnect the water pump pulley.
3Remove the mounting bolts for the water pump, and disconnect the pump from the engine. Discard the gasket for the water pump, and clean the mounting surfaces for the gasket with a clean cloth.
4Mount the new gasket to the studs of the water pump, and install the new water pump. Tighten the mounting bolts for the water pump to 5 foot-pounds with a torque wrench.
5Install the water pump pulley. Install the water pump pulley bolts finger tight. Install the drive belt. Tighten the water pump pulley bolts to 22 foot-pounds.
6Connect the air cleaner and the cable for the negative battery terminal with a socket wrench. Replace the coolant in the radiator and check for coolant leaks.
7Run the engine until it reaches its normal operating temperature. Check for coolant leaks again and top off the coolant if necessary.
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