Rotary Valve

1. Install a 0 - 13,789 kPa (0 - 2000 psi) pressure-gauge (Tool D79L-33610-A, Power Steering Analyzer) in the pressure line between the power steering pump outlet port and the integral steering gear inlet port. Be sure that the valve on the gauge is fully open.
2. Check the fluid level in the reservoir and add Premium Power Steering Fluid, E6AZ-19582-AA (ESW-M2C33-F) or equivalent, if necessary.
3. Start the engine and turn the steering wheel from stop-stop to bring the steering fluid to normal operating temperature. Turn off the engine and re-check the fluid level. Add Premium Power Steering fluid, E6AZ-19582-AA (ESW-M2C33-F) or equivalent if necessary.
4. With the engine running at approximately 1000 rpm and the steering wheel centered, attach an in. lb. torque wrench to the steering wheel nut. Apply sufficient torque in each direction to get a gauge reading of 1723 kPa (250 psi).
5. The torque wrench readings should be the same in both directions at 1723 kPa (250 psi). If the difference between the readings exceeds 0.68 N.m (6 in.lbs.), remove the steering gear and replace the shaft and control assembly (-3D517-).
6. When performing the valve spool centering check outside the vehicle, use the procedures described above, except take the torque and pressure readings at the right and left stops instead of either side of center.

NOTE:
- A hissing noise is a normal characteristic of rotary valve steering gears and in no way affects steering.
- Do not replace the shaft and control assembly unless the hiss is EXTREMELY objectionable.
- A replacement valve will also exhibit slight noise, and is not usually a cure for the complaint.
- Any metal-to-metal contacts, such as column grounding, coupling grounding, or sheet metal to steering components will transmit valve hiss noise into the passenger compartment.
- The only service that can be performed on the 3D517 valve assembly is the replacement of the four valve sleeve O-rings on the valve sleeve and replacement of the control valve housing.