How to Change a Power Steering Pump on a 93 S-10 4.3

The power steering pump on a 1993 Chevy S-10 with a 4.3-liter V-6 engine is a self-contained unit with a built-in reservoir. The engine uses a serpentine belt for accessory drive. For belt tensioning it uses a spring loaded automatic belt tensioner. The power steering pump pulley is of the pressed on type, which requires the use of a special puller to withdraw it from the pump shaft.

Instructions

1

Place the drain pan under the power steering pump. Loosen the clamp on the low-pressure return line with the flat head screwdriver and pull the line off. Hold it down to allow the power steering fluid to drain into the pan.

2

Remove the high-pressure line using a line wrench. Place a socket with a ratchet on the serpentine belt tensioner and push the tensioner away from the belt. Lift the belt off the power steering pulley.

3

Install the power steering pump puller on the nose of the pulley. The pulley has a nose with a groove. Place the pullers jaws in the groove and thread the pilot bolt in the power steering pump shaft until it bottoms out.

4

Place a wrench on the head of the pilot bolt to hold it in position and with the large adjustable wrench, turn the large nut on the pilot bolt counterclockwise to withdraw the pulley. Remove the bolts securing the pump to the mounting bracket using a socket and ratchet.

5

Position the new pump in the mounting bracket and install the bolts. Torque the bolts to 36 foot-pounds. Position the pulley over the nose of the new power steering pump input shaft. Install the puller by threading the pilot bolt into the power steering pump shaft until it bottoms out.

6

Hold the head of the pilot bolt with a wrench and with the large adjustable wrench, turn the large nut clockwise to press the pulley onto the power steering pump shaft. Continue to push it on until the pump shaft is flush with the nose of the pulley. Remove the puller.

7

Install the high-pressure line using a line wrench. With the use of a crows foot, short extension and the torque wrench, torque the high pressure line fitting to 20 foot-pounds. Install the low-pressure line by pushing it on the port on the rear of the pump and tightening the line clamp with the flat head screwdriver.

8

Place a socket with a ratchet on the serpentine belt tensioner bolt. Push the tensioner away from the belt and fit the belt over the power steering pump pulley. Release the tension on the tensioner pulley.

9

Raise the truck until the tires are off the ground using the floor jack. Turn the wheels all the way to the left. Fill the power steering reservoir with GM Fluid No. 1050017 power steering fluid or equivalent to the cold mark on the reservoir. Turn the wheels side to side several times without striking the steering stop. All the air must be removed from the system in order for it to operate adequately. The bleeding process is complete when the fluid is clear with no evidence of air bubbles, which will cause the fluid to look milky or a tan color.

10

Start the engine and turn the wheels from side to side several more times. With the engine running, check the fluid condition and the level as well. Add fluid as necessary to bring the level within specifications and install the cap. If the fluid is not yet clear turn the wheels from side to side again and recheck the fluid until it is clear. Shut off the engine. Straighten the wheels and lower the truck.

11

Start the engine and allow it to run for two or three minutes. Check the fluid and top it off as necessary. Test drive the truck and make sure the steering works smoothly without any whining from the power steering pump. Park the truck and top off the power steering pump as necessary while checking the fluid for any sign of air.