OEM 2004 Toyota 4Runner Power Steering Pump

2004 Toyota 4Runner Parts Questions & Experts Answers

• Q: How to service and repair the power steering pump on 2004 Toyota 4Runner?

  A: The power steering fluid drain alongside air cleaner assembly removal starts the service and repair process of the power steering pump. To proceed with the vane pump V belt removal you should first loosen the belt tensioner's counterclockwise direction. You should disconnect the oil reservoir to pump hose No.1 by removing vacuum hoses while loosening clips before separating the pressure feed tube assembly by unscrewing its union bolt and removing the gasket. Start by removing vane pump assembly by disassembling bolt and nut connections and employing tool E10 torx socket to remove stud bolt. A torque measurement of the vane pump should show smooth rotation without unusual sounds and a maximum allowed torque of 0.28 Nm (2.8 kgf-cm, 2.4 inch lbs.). The pulley rotation should be prevented through the use of Special Service Tool: 09960-10010 (09962-01000, 09963-01000) which allows users to remove the pulley nut and pulley from the vane pump. Remove the power steering suction port union together with the pressure port union and flow control valve as well as spring before you carefully detach the O-rings. The plastic hammer can be used to gently tap the vane pump housing rear if needed during bolt removal of its four bolts. You need to eliminate the side plate followed by the wave washer and cam ring and vane pump rotor with ten vane plates and the vane pump shaft. Disassemble the vane pump housing front along with its oil seal by using a screwdriver wrapped in vinyl tape while avoiding damage to the housing assembly. Use a micrometer and caliper gauge to check oil clearance because it should be between 0.03-0.05 mm (0.0012-0.0020 inch) yet never exceed 0.07 mm (0.0028 inch). Check both the minimum requirements and dimensions of vane pump plates (height and thickness) while monitoring the groove-to-plate clearance of the vane pump rotor. Check the flow control valve's operation for smoothness and leakage before changing it to another valve with the same inscribed mark A, B, C, D, E or F. Also measure the flow control valve compression spring free length and replace it if necessary to meet 33.2 mm (1.307 inch). A broken pressure port union seat requires replacement of the component. The new oil seal needs to be installed with its lip receiving power steering fluid before pressing it in utilizing Special Service Tool: 09950-60010 (09951-00320), 09950-70010 (09951-07100). Drive the vane pump shaft into position and secure it with new straight pins by using a plastic hammer. Begin installation by first placing the snap ring then the cam ring and rotor so that both components display their inscribed marks toward the exterior before adding the ten plates. Position the new gasket on the front housing before installing the vane pump side plate rear by matching its straight pins alignment. To complete the installation replace the vane pump housing rear by positioning the wave washer correctly with new O-rings that received power steering fluid treatment before using four bolts that require a torque setting of 24 Nm (240 kgf-cm, 17 ft. lbs.). The pressure port union assembly should receive a 83 Nm (850 kgf-cm, 61 ft. lbs.) torque following insertion with the spring and flow control valve while wearing a new O-ring that is coated with power steering fluid. Put the power steering suction port union together with the new O-ring and bolt it with a torque of 13 Nm (130 kgf-cm, 9 ft. lbs.). Finally reattach the vane pump pulley and nut through Special Service Tool: 09960-10010 (and its variants 09962-01000 or 09963-01000) to secure the pulley while torquing the new pulley set nut to 44 Nm (449 kgf-cm, 32 ft. lbs.). Apply a torx socket (E10) to secure the vane pump assembly by fastening the stud bolt to 22 Nm (224 kgf-cm, 16 ft. lbs.) and the two bolts with their nut to 43 Nm (438 kgf-cm, 32 ft. lbs.). Reinstall the vane pump V belt then apply a new gasket between the pressure feed tube assembly components before torquing the connection to 51 Nm (520 kgf-cm, 38 ft. lbs.). Finally, connect the oil reservoir to pump hose No.1. Finish the process by reinstalling the air cleaner component then add power steering liquid before carrying out system bleeding and checking for fluid leakage.