OEM 2001 Toyota Sienna Power Steering Pump

2001 Toyota Sienna Power Steering Pump Parts Q&A

• Q: How to service and repair the power steering pump on 2001 Toyota Sienna?

  A: The PS vane pump rotating torque needs measurement before work begins to confirm smooth operation with no strange sounds while maintaining a maximum torque value of 0.3 Nm (2.8 kgf-cm, 2.4 inch lbs.). Using Special Service Tool: 09960-10010 (09962-01000, 09963-01000) you must stop the pulley from moving and then separate the front and rear brackets by eliminating their 3 bolts and 2 nuts. The removal process begins with reinstalling the suction port union by taking out the bolt and O-ring while removing the pressure port union then separating the flow control valve along with its spring and all O-rings. Proceed with the following sequence of removal starting with 4 bolts then 2 O-rings on the rear housing and continue by eliminating the wave washer and side plate and their included gasket along with cam ring and the rotor and 10 plates watching for vane plate drop-offs. The front housing requires removal of both its vane pump shaft in addition to the 2 straight pins installed there. The inspection of vane pump shaft and bushing oil clearance must be done using micrometer and caliper gauge for proper results. A standard clearance range from 0.03 to 0.05 mm (0.0012 to 0.0020 inch) is required within this test with a maximum limit of 0.07 mm (0.0028 inch). The vane pump rotor and vane plates need to be measured for height, thickness, and length which each must meet the minimum of 8.6 mm (0.339 inch), 1.397 mm (0.0550 inch), and 14.991 mm (0.5902 inch) separately while the clearance between the rotor groove and plate must not exceed 0.035 mm (0.0014 inch). The flow control valve needs inspection that involves coating it with power steering fluid followed by a smooth insertion into the valve hole and then checking for leakage through compressed air application at 392 - 490 kPa (4 - 5 kgf/cm2, 57 - 71 psi). Use vernier calipers to measure the unstrained length of the spring until it reaches at least 32.3 mm (1.272 inches). Use Special Service Tool: 09950-60010 (09951-00330) or 09950-70010 (09951-07100) for correct installation direction to implement the procedure of carefully removing old oil seal using vinyl tape-wrapped screwdriver and coating new seal lip with power steering fluid before pressing it in. When building the system apply power steering fluid to each designated area and then set the vane pump shaft in place followed by insertion of two fresh straight pins through plastic hammering while taking precautions to avoid damaging them. Position the cam ring on the straight pins while installing it with the inscribed mark outside before adding the vane pump rotor and snap ring. Mount 10 vane plates with round ends exposed while adding a new gasket to overlap the side plate which fits into straight pins. Secure the rear housing with 4 bolts which need to be tightened to 17 Nm (170 kgf-cm, 12 ft. lbs.) while you have installed 2 new O-rings previously coated in power steering fluid to the rear housing ports. The installation requires correct positioning of the flow control valve while the pressure port union receives power steering fluid-coated new O-ring and torque application at 83 Nm (850 kgf-cm, 62 ft. lbs.). Begin by attaching the suction port union with a new O-ring then tighten it to 13 Nm (130 kgf-cm, 9 ft. lbs.) before securing the front and rear brackets with 3 bolts along with 2 nuts at 43 Nm (440 kgf-cm, 32 ft. lbs.). Position the vane pump pulley in place followed by installing its nut while using Special Service Tool: 09960-10010 (09962-01000, 09963-01000) to prevent pulley rotation before torquing the nut to 43 Nm (440 kgf-cm, 32 ft. lbs.). Afterward, measure the PS vane pump rotating torque again.