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HOMESERVICE MANUALSPONTIAC1991FIREBIRD FORMULA, 5.0 F, STANDARD, M39REPAIR AND DIAGNOSIS (SINGLE PAGE)STEERINGPOWER STEERINGSTEERING GEAR - POWEROVERHAULPOWER STEERING PUMPDISASSEMBLY
1991 Pontiac Firebird Formula, 5.0 F, Standard, M39

Power Steering Pump: Disassembly

1991 Pontiac Firebird Formula, 5.0 F, Standard, M39SECTION Disassembly
  1. Remove pulley from shaft. See POWER STEERING PUMP  under REMOVAL & INSTALLATION. Remove brackets from pump. Drain reservoir. Clean exterior of pump. Clamp pump in a soft-jawed vise, shaft down, between square boss and shaft housing. See Fig 1 .
    Fig 1: Exploded View of Saginaw Power Steering Pump
    G90F09989Courtesy of GENERAL MOTORS CORP.
  2. Remove union bolt and "O" ring seal. Remove mounting studs. Rock filler tube back and forth gently to loosen. Work reservoir off pump housing. Remove and discard all "O" rings.
  3. Using a punch, tap end cover retainer ring until one end of ring is near hole in pump housing. Insert punch in hole far enough to disengage ring from groove in pump bore. Pry ring out of pump housing.
  4. Tap end cover with plastic mallet to jar it loose. Spring located under end cover should push it up. Remove pump housing from vise. Place pump in an inverted position on a clean, flat surface.
  5. Tap end of drive shaft with plastic mallet to loosen pressure plate, rotor and thrust plate assembly from housing. Lift pump housing from rotor assembly.
  6. Flow control valve and control valve spring should slide out of bore. See Fig 2 . Remove and discard end cover and pressure cover "O" rings. Remove drive shaft oil seal.
    Fig 2: Exploded View of Flow Control Valve
    G90E09998Courtesy of GENERAL MOTORS CORP.
  7. Lift pressure plate and cam ring from rotor. Remove 10 vanes from slots. Clamp drive shaft in soft-jawed vise with rotor and thrust plate upward.
  8. Remove and discard rotor lock ring. Use care to avoid nicking rotor end face. Slide rotor and thrust plate off drive shaft. Remove drive shaft from vise.
NOTE: Individual flow control valve parts are not available. Replace flow control valve as an assembly if worn or damaged. If pump is being overhauled because of contamination in system, valve can be disassembled for cleaning.
RENDER: 1.0x

NO RELATED

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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

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  • • You are missing required tools, torque specs, or safe lifting equipment.
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