GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Isuzu 🢒 2000 🢒 Isuzu MD Steel Tilt (F Model) 🢒 Brakes 🢒 Air Compressor 🢒 Air Compressor Replacement

Removal Procedure
  1. Set the parking brake.
  2. Block the wheels.
  3. Tilt the cab. Refer to Cab Tilting in General Information.
  4. Drain all of the air reservoirs. Refer to Draining Reservoirs in Air Brakes.
  5. Drain the coolant to below the level of the air compressor. Refer to Cooling System Draining and Filling in Engine Cooling.

    6. Object Number: 294385 Size: SH
  6. Remove the coolant return pipe eye bolt, two gaskets connecting coolant return pipe to the air compressor. Discard all of the gaskets.

    7. Object Number: 294399 Size: SH
  7. Disconnect the air inlet pipe at the air compressor.

    8. Object Number: 294400 Size: SH
  8. Remove the two coolant inlet pipe eye bolts, four gaskets and the coolant inlet pipe from the air compressor and the engine. Discard all of the gaskets.

    9. Object Number: 294403 Size: SH
  9. Remove the discharge pipe eye bolt, two gaskets connecting discharge pipe to the air compressor. Discard all of the gaskets.

    10. Object Number: 294404 Size: SH
  10. Remove the governor pipe eye bolt, two gaskets connecting the governor pipe to the air compressor. Discard all of the gaskets.

    11. Object Number: 294406 Size: SH
  11. Remove the mounting bolts and the nut.
  12. Remove the air compressor.
  13. Remove the air compressor O-ring seal. Discard the O-ring.
  14. Clean the exterior of the air compressor.
  15. Clean any corroded lines.
  16. Check for cracks on the following parts:
    17. • The air compressor crankcase
    • The mounting bosses
  17. Ensure that the air compressor is in good condition and is not excessively worn.

Installation Procedure

    Object Number: 294406 Size: SH
  1. Install a new air compressor O-ring seal.
  2. Install the air compressor.

    3. Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  3. Install the mounting bolts and the nut.

    4. Tighten

    1. Tighten the bolt to 57 N·m (42 lb ft).
    2. Tighten the nut to 71 N·m (52 lb ft).

    Object Number: 294404 Size: SH
  4. Install the governor pipe at the air compressor using the governor pipe eye bolt and two new gaskets.

    5. Tighten
    Tighten the governor pipe eye bolt to 41 N·m (30 lb ft).


    Object Number: 294403 Size: SH
  5. Install the air discharge pipe at the air compressor using the air discharge pipe eye bolt and two new gaskets.

    6. Tighten
    Tighten the air discharge pipe eye bolt to 63 N·m (46 lb ft).


    Object Number: 294400 Size: SH
  6. Install the coolant inlet pipe at the air compressor using the coolant inlet pipe eye bolt and two new gaskets.

    7. Tighten
    Tighten the coolant inlet pipe eye bolt to 41 N·m (30 lb ft).


    Object Number: 294399 Size: SH
  7. Install the air inlet pipe to the air compressor.

    8. Tighten
    Tighten the air inlet pipe to 63 N·m (46 lb ft).


    Object Number: 294385 Size: SH
  8. Install the coolant return pipe using two coolant inlet pipe eye bolts and four new gaskets.

    9. Tighten
    Tighten the coolant return pipe eye bolt to 41 N·m (30 lb ft).

  9. Fill the cooling system. Refer to Cooling System Draining and Filling in Engine Cooling.
  10. Fill the engine with oil. Refer to Fluid and Lubricant Recommendations in Maintenance and Lubrication.
  11. Lower the cab. Refer to Cab Tilting in General Information.
  12. Remove the wheel blocks.