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Pump Overhaul: Disassembly

NOTE: Refer to the Exploded View as needed during the following procedure. See Figure .
  1. Drain the fluid from the pump by turning the pulley.
  2. Remove the power steering pump (see Pump Replacement  ).
  3. Hold the power steering pump (A) in a vise with soft jaws (B), hold the pulley (C) with the special tool (D), and remove the pulley nut (E) and pulley. Be careful not to damage the pump housing with the jaws of the vise.
    Fig 1: Holding Power Steering Pump In A Vise With Soft Jaws
    G01462422Courtesy of AMERICAN HONDA MOTOR CO., INC.
  4. Remove the inlet joint and O-ring.
  5. Remove the pressure control valve cap, O-ring, valve spring, and pressure control valve.
  6. Remove the pump housing cap, O-ring, and pump preload spring.
  7. Remove the pump cover and pump cover seals.
  8. Pull out the roll pin.
  9. Remove the outer case, cam ring, rotor, vanes, and side plate.
  10. Remove the rubber seal and slipper seal from the outer case.
  11. Remove the O-rings from the bottom of the housing.
  12. Remove the snap ring, then remove the pump drive shaft by tapping the shaft end with the plastic hammer.
  13. Remove the seal from the pump housing.
    1. Inspection 
  14. Check the pressure control valve for wear, burrs, and other damage to the edges of the grooves in the valve.
    Fig 2: Checking Pressure Control Valve
    G01462423Courtesy of AMERICAN HONDA MOTOR CO., INC.
  15. Inspect the bore of the pressure control valve on the pump housing for scratches and wear.
  16. Slip the pressure control valve back in the pump housing, and check that it moves in and out smoothly. If OK, go to step 17; if not, replace the pump as an assembly. The pressure control valve is not available separately.
    Fig 3: Slipping Pressure Control Valve Back In Pump Housing
    G01462424Courtesy of AMERICAN HONDA MOTOR CO., INC.
  17. Attach a hose (A) to the end of the pressure control valve (B) as shown. Then submerge the pressure control valve in a container of power steering fluid or solvent (C), and blow in the hose.
    • If air bubbles leak through the valve at less than 98kPa (1.0 kgf/cm2 , 14.2 psi), replace the pump as an assembly. The pressure control valve is not available separately.
    • If the pressure control valve is OK, set it aside for reassembly later.
      Fig 4: Attaching A Hose To End Of Pressure Control Valve
      G01462425Courtesy of AMERICAN HONDA MOTOR CO., INC.
  18. Inspect the ball bearing by rotating the outer race slowly. If you feel any play (axial or radial) or roughness, remove the faulty ball bearing (A), and install a new one (B).
    Fig 5: Removing Faulty Ball Bearing
    G01462426Courtesy of AMERICAN HONDA MOTOR CO., INC.
  19. Inspect each part shown with an asterisk in the Exploded View (see Pump Overhaul  ); if any of them are worn or damaged, replace the pump as an assembly.
    1. Reassembly 
  20. Install the new pump seal (A) (with its grooved side facing in) into the pump housing (B) by hand first, then drive it in using the special tools until there is no step at the top of the pump seal, and the seal is fully seated in the pump housing.
    Fig 6: Installing New Pump Seal
    G01462427Courtesy of AMERICAN HONDA MOTOR CO., INC.
  21. Position the pump drive shaft (A) in the pump housing, then press it in with the appropriate size socket wrench (B) as shown. Do not apply more than 1,370 N (140 kgf, 308 Ft.Lbs.) of pressure.
    Fig 7: Positioning Pump Drive Shaft In Pump Housing
    G01462428Courtesy of AMERICAN HONDA MOTOR CO., INC.
  22. Install the 40 mm snap ring (C) with its radiused side facing out.
  23. Coat the new 23.8 mm O-ring (A) with power steering fluid, then position it on the bottom (B) of the pump housing.
    Fig 8: Coating New 23.8 mm O-Ring With Power Steering Fluid
    G01462429Courtesy of AMERICAN HONDA MOTOR CO., INC.
  24. Coat the new cover seals (A) and (B) with power steering fluid, then position them into the grooves on the cover (C).
    Fig 9: Coating New Cover Seals & With Power Steering Fluid
    G01462430Courtesy of AMERICAN HONDA MOTOR CO., INC.
  25. Install the outer case (A) by aligning the slot (B) inside the outer case with the cover roll pin hole (C). Be sure that the slit (D) on the outer case is to the direction shown.
    Fig 10: Installing Outer Case
    G01462431Courtesy of AMERICAN HONDA MOTOR CO., INC.
  26. Apply power steering fluid to the rubber seal (E) (black), and install it in the slot (F) of the outer case.
  27. Apply power steering fluid to the slipper seal (G) (white), and install it on top of the rubber seal you just installed.
  28. Install the cam ring (A) by aligning the slot (B) with the slot (C) in the outer case.
    Fig 11: Installing Cam Ring
    G01462432Courtesy of AMERICAN HONDA MOTOR CO., INC.
  29. Insert the roll pin (D) into the slots between the cam ring and outer case, then push the roll pin into the set hole (E).
  30. Install the rotor (A) in the cam ring (B).
    Fig 12: Installing Rotor In Cam Ring
    G01462433Courtesy of AMERICAN HONDA MOTOR CO., INC.
  31. Set the 11 vanes (C) in the grooves in the rotor. Make sure that the round ends (D) of the vanes are in contact with the sliding surface of the cam ring.
  32. Place the side plate (A) on the cam ring, and align the roll pin set hole (B) with the roll pin (C).
    Fig 13: Aligning Roll Pin Set Hole With Roll Pin
    G01462434Courtesy of AMERICAN HONDA MOTOR CO., INC.
  33. Coat the new 51 mm O-ring (D) with the power steering fluid, then position it into the groove on the side plate.
  34. Install the pump housing (A) over the cover assembly (B).
    Fig 14: Installing Pump Housing Over Cover Assembly
    G01462435Courtesy of AMERICAN HONDA MOTOR CO., INC.
  35. Align the bolt holes in the cover (A) with the threaded holes in the pump housing. Install the flange bolts loosely first, then torque the flange bolts in a criss-cross pattern in two or more steps.
    Fig 15: Installing Flange Bolts
    G01462436Courtesy of AMERICAN HONDA MOTOR CO., INC.
  36. Push in the cam ring (A) from the pump housing cap hole (B) with a flat-tip screwdriver to make sure the cam ring is fully seated against the outer case.
    Fig 16: Pushing Cam Ring From Pump Housing Cap Hole
    G01462437Courtesy of AMERICAN HONDA MOTOR CO., INC.
  37. Install the pump preload spring (A) in the pump housing.
    Fig 17: Installing Pump Preload Spring
    G01462438Courtesy of AMERICAN HONDA MOTOR CO., INC.
  38. Coat the new 12.7 mm O-ring (B) with power steering fluid, and install it on the pump housing cap (C).
  39. Install the pump housing cap on the pump housing, and tighten it to specified torque.
  40. Install the pressure control valve spring (A) in the pump housing.
    Fig 18: Installing Pressure Control Valve Spring
    G01462439Courtesy of AMERICAN HONDA MOTOR CO., INC.
  41. Coat the pressure control valve (B) with power steering fluid, and install it in the pump housing.
  42. Coat the new 16.7 mm O-ring (C) with power steering fluid, and install it on the pressure control valve cap (D).
  43. Install the pressure control valve cap on the pump housing, and tighten it to the specified torque.
  44. Coat the new 13 mm O-ring (A) with power steering fluid, and install it on the inlet joint (B).
    Fig 19: Coating New 13 mm O-Ring With Power Steering Fluid
    G01462440Courtesy of AMERICAN HONDA MOTOR CO., INC.
  45. Install the inlet joint on the pump housing.
  46. Install the pulley (A), then loosely install the pulley nut (B). Hold the power steering pump in a vise with soft jaws. Be careful not to damage the pump housing with the jaws of the vise.
    Fig 20: Installing Pulley & Pulley Nut
    G01462441Courtesy of AMERICAN HONDA MOTOR CO., INC.
  47. Hold the pulley with the special tool, and tighten the pulley nut to the specified torque.
  48. Check that the pump turns smoothly by turning the pulley. If it turns hard, loosen the four flange bolts on the cover, then retighten them as in step  35 , and check the pump again.
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