Isuzu Cars and Trucks 1981-1991

Power Steering Pump

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REMOVAL AND INSTALLATION
Cars
  1. Disconnect the negative battery cable. Remove all necessary drive belts.
  2.  
  3. Disconnect the high pressure lines from the power steering pump and let them and the pump drain out into a suitable drain pan. On the Impulse G200Z engine it is necessary to remove the under the engine dust cover in order to reach the high pressure lines and to remove the drive belt.
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  5. In the I-Mark models, remove the power steering pump adjusting plate, brackets and retaining bolts. Then remove the power steering pump from the vehicle.
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  7. On the G200Z Impulse, remove the power steering pump pulley, brackets and retaining bolts and remove the pump from the vehicle.
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  9. On the 4ZCI-T Impulse, remove the V-belt, pump pulley, idler pulley, brackets and retaining bolts. Then remove the pump from the vehicle.
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  11. Installation is the reverse order of the removal procedure. Tighten the drive belts to specifications, refill the power steering reservoir, bleed the system and start the car and check for leaks.
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BLEEDING
  1. Turn the wheels to the extreme left.
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  3. With the engine stopped, add power steering fluid to the MIN mark on the fluid indicator.
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  5. Start the engine and run it for 15 seconds at fast idle.
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  7. Stop the engine, recheck the fluid level and refill to the MIN mark.
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  9. Start the engine and turn the wheels from side to side (3 times).
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  11. Stop the engine check the fluid level.
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NOTE
If air bubbles are still present in the fluid, the procedure must be repeated.

Trucks
  1. Disconnect the negative battery cable.
  2.  
  3. Disconnect and plug the inlet and outlet fluid lines from the power steering pump.
  4.  
  5. Remove the drive belt from the pump.
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  7. Remove the pump-to-bracket bolts and the pump from the brackets.
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  9. To install, reverse the removal procedures.
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  11. Connect the negative battery cable. Refill and bleed the power steering system.
  12.  

BELT ADJUSTMENT
  1. Loosen the power steering pump adjusting bolts.
  2.  
  3. Using finger pressure, between the idler pulley and the power steering pump pulley, check the belt deflection; it should be 10mm.
  4.  
  5. With the power steering pump adjusted to the correct belt deflection, tighten the pump bolts.
  6.  

SYSTEM BLEEDING
  1. Fill the power steering reservoir to the proper level when cold.
  2.  
  3. Start and operate the engine until it reaches normal operating temperatures.
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  5. Turn the engine OFF and check the fluid level. If necessary, fill the reservoir to the proper level.
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  7. Run the engine and turn the steering wheel from lock-to-lock, in both directions, 34 times; do not hold the steering wheel at the lock position for more than 5 seconds or temperature rise will result.
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  9. Return the steering wheel to center, turn the engine OFF and allow the fluid to sit for 5 minutes before adding any more.
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  11. If necessary, repeat the bleeding procedure until the air bubbles are removed from the system.
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  13. Fill the system to the proper level when finished.
  14.  

 
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