Section 11-02: Steering System, Power
1993 Mustang Workshop Manual
CLEANING AND INSPECTION

Steering Pump, Power

 

Cleaning

Wash all parts, except seals, in a chlorinated solvent and dry with compressed air.

 

Inspection

To determine when to replace power steering pump components, refer to the following guidelines.

NOTE: Some components must be replaced regardless of condition.

  1. Reuse the outlet fitting if the corners are not rounded and the threads are intact.
  1. Replace all seals except the rotor shaft seal. Reuse the rotor shaft seal if it does not leak.
  1. Reuse the reservoir assembly if the reservoir seal areas are not damaged. Check for a broken or missing baffle.
  1. Reuse the housing or housing assembly if the O-ring and snap ring surfaces are not damaged.
  1. Reuse upper and lower pressure plates if there is no scoring on the wear surface. Polish the phosphate coating, if necessary, but do not remove it.
  1. Reuse the rotor cam assembly, if wear is limited to removal of the phosphate coating on the cam contour. Do not disassemble the unit. Push the rotor part way through the cam insert, being careful not to dislodge the slippers and springs. Check the cam ID for scoring or burring. Check the rotor faces and OD for scoring and chipping.

    Do not service or refinish the upper and lower pressure plates, cam, or rotor assembly. If wear or burring is evident, replace them with new components.

  1. Install a new rotor and cam assembly if the slippers are worn. Replace the springs if they are bent or broken.
  1. Reuse the rotor shaft if the thrust faces, bushing diameter and shaft seal diameter are not excessively worn or scored.
  1. Reuse the housing and bushing assembly if all of the threaded holes are not damaged beyond service and the bushing diameter is not scored or worn 0.01mm (0.0005-inch) over the 18mm (0.6897-inch) maximum. Service threaded holes by drilling out the damaged threads and installing helicoil inserts. If the bushing is scored or excessively worn, install a new housing and bushing assembly.
  1. Reuse valve body if valve bore is free of nicks and scoring. Valve must fall freely in valve bore. Replace valve housing and/or valve if valve sticks in bore.