GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2007 🢒 TopKick C-Series (Conventional) C4/C5 🢒 General Information 🢒 General Information 🢒 Engine Flywheel Replacement

Removal Procedure

    Caution: Refer to Battery Disconnect Caution in the Preface section.

    Important: In order to maintain the proper component balance, contact surface taper and heat transfer, manual transmission flywheels are NOT to be machined.

  1. Disconnect the negative battery cable.
  2. Raise the vehicle. Refer to Lifting and Jacking the Vehicle.
  3. Remove the transmission assembly. Refer to Transmission Replacement for the automatic transmission or Transmission Replacement for the manual transmission.

    4. Object Number: 814030 Size: SH
  4. Remove the clutch assembly. (MT vehicle)
  5. Remove the flywheel bolts and washer.

    6. Object Number: 814031 Size: SH
  6. Remove the flexplate 1 and 2. (AT vehicle).
  7. Remove the flywheel assembly.
  8. Inspect the flywheel for burning, scoring, warping or excessive wear.
  9. Inspect the flywheel ring gear for worn or broken teeth.

Installation Procedure
  1. Install the flywheel to the crankshaft.

    2. Object Number: 814034 Size: SH

    Notice: Refer to Fastener Notice in the Preface section.

  2. Install the flywheel bolts and spacer.

    3. Tighten
    Tighten the flywheel bolts, in the first stage, to 78 N·m (58 lb ft).

  3. Install the flex plate 1 and 2 with knock pin, confirming the installation direction. (AT vehicle)
  4. To install the flex plate 1 and 2, insert a shaft to net hole. Remove the shaft after installation of flex plate. (AT vehicle)

    5. Object Number: 814035 Size: SH
  5. Install the flywheel bolts and washer.

    6. Tighten the flywheel bolts in the following stages according to the order in figure.

    Tighten

    1. First stage: 78 N·m (58 lb ft)
    2. Second Stage: 60 degrees
    3. Third stage: 60 degrees
  6. Install the clutch to the flywheel. (MT vehicle)
  7. Install the transmission assembly. Refer to Transmission Replacement for the automatic transmission or Transmission Replacement for the manual transmission.
  8. Lower the vehicle.
  9. Connect the negative battery cable.