Saturday, April 23, 2011

How to change water pump housing 1998 aurora oldsmobile?

The water pump in your 1998 Oldsmobile Aurora is mounted onto the front of the engine and is rotated by a pulley. The pulley is part of the entire serpentine belt system. The pump draws coolant into the engine block through the lower radiator hose, and circulates the coolant through the engine block. The coolant continues its circulation through the engine and out to through the water pump and lower radiator hose.

The procedure to replace water pump is as follows:---
  • Park the vehicle and allow it to fully cool before performing the water pump replacement repair. Raise the hood, put on your safety glasses and remove the radiator cap to relieve the pressure. Disconnect the negative battery cable using a crescent wrench, for added safety.

  • Place the drain pan below the radiator drain plug located on the bottom-left side, when facing the engine. Reach under the front end and loosen the drain plug to partially drain the radiator. Drain the coolant to a level just below the bottom of the water pump assembly. Re-tighten the drain plug.

  • Remove the fan shroud (safety shield) using a socket wrench. Detach the engine fan and fan clutch assembly from the pulley by removing the mounting bolt. Be careful not to drop or damage the fan clutch unit.

  • Locate the pulley tensioner used to loosen the serpentine belt for removal. Loosen the pulley tensioner using a serpentine belt removal tool by turning it counterclockwise. Hold the center tensioner bolt clockwise to release tension and remove the belt from the water pump housing cover. The tensioner will return to its regular tension once released.

  • Remove the four bolts mounting the pulley to the water pump unit using the socket wrench and extension as necessary.

  • Disconnect the lower radiator and heater hoses attaching at the water pump by releasing the squeeze-type clamps. Take out the 11 retaining bolts mounting the water pump to the engine block. Carefully note the location of each bolt removed, because they are on different lengths.

  • Gently tap the water pump using a rubber mallet to break the seal, then remove the unit. Remove the old gasket using a gasket scraper, using care not to allow any debris to enter the engine opening.

  • Apply a continuous bead of gasket sealant onto the replacement gasket. Place the gasket on the water pump opening and make sure that the mounting bolt holes are properly aligned. Apply another bead of sealant onto the remaining side of the gasket.

  • Install the replacement water pump and secure it in place by screwing in a few bolts in a staggered pattern. Put in the remaining bolts and tighten them all, again using a staggered pattern.

  • Attach the lower radiator and heater hoses to the water pump and secure in place with their squeeze-type clamps.

  • Connect the belt pulley to the water pump and screw in place. Loosen the pulley tensioner by turning it counterclockwise and split on the serpentine belt, then release the tensioner.

  • Carefully connect the engine fan and fan clutch assembly from the belt pulley. Reconnect the fan shroud (safety shield) and reconnect the battery cable.

  • Pour the drained antifreeze (coolant) back into the radiator and start the engine. Allow the engine to run for several minutes to remove any trapped air within the system. Replace the radiator fill cap and check for leaks at all connections.