GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1998 🢒 GMC C-Series Medium Duty Truck B7 🢒 Engine 🢒 Vacuum Pump 🢒 Vacuum Pump Replacement

Removal Procedure

    Object Number: 177123 Size: SH
  1. Disconnect the negative battery cable. Refer to .
  2. Remove the drive belt from the pulleys. Refer to .
  3. Remove the vacuum line from the vacuum pump.

    4. Object Number: 177149 Size: SH
  4. Remove the vacuum pump mounting bolts.
  5. Remove the vacuum pump.

    6. Object Number: 177202 Size: SH
  6. Remove the vacuum pump pulley:
    7. 6.1. Place the vacuum pump in a vise.
    6.2. Attach the to the pulley.
    6.3. Remove the pulley from the vacuum pump using the .

    Object Number: 177205 Size: SH
  7. Install the vacuum pump pulley on the vacuum pump.
    8. 7.1. Attach the to the vacuum pump pulley.
    7.2. Install the vacuum pump pulley to the vacuum pump.
    7.3. Remove the .
  8. Remove the vacuum pump from the vise.

Installation Procedure

    Object Number: 177149 Size: SH
  1. Install the vacuum pump.
  2. Install the mounting bolts.

    3. Tighten
    Tighten the bolts to 27 N·m (20 lb ft).


    Object Number: 177123 Size: SH
  3. Install the vacuum line to the vacuum pump.
  4. Install the drive belt on the pulleys. Refer to .
  5. Connect the battery negative cables on the batteries. Refer to in Engine Electrical.