GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2008 🢒 TopKick C-Series (Conventional) C4/C5 🢒 Engine 🢒 Engine Mechanical - 7.8L 🢒 Positive Crankcase Ventilation Oil Separator Replacement

Removal Procedure

    Object Number: 1992551 Size: MH
  1. Remove the engine harness clip (15) attached to the oil separator bracket (14).
  2. Remove the oil separator body cover (7). Refer to Oil Separator Body Cover Replacement.
  3. Remove the oil separator cap cover (11).

    4. Important: Before removing, mark the hose's assembly position.

  4. Remove the PCV rubber hose (4) together with the clip.
  5. Remove the oil drain rubber hose (8).
  6. Remove the oil separoator (PCV) (10) with bracket attached (14).
  7. Remove the bracket (14) from the oil separator (PCV) (10).

Installation Procedure

    Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 1992551 Size: MH
  1. Install the oil separator (PCV) (10) to the bracket (14).

    2. Tighten
    Tighten the oil separator to bracket to 14N·m (10 lb ft).

  2. Install the oil separator (PCV) (10) and the bracket (14) to the engine.

    3. Tighten
    Tighten the oil separator bracket to engine 40N·m (30 lb ft).

  3. Install the oil drain rubber hose (8).

    4. Important: Assemble the aligned mark made prior to the removal.

  4. Assemble the PCV rubber hose (4) to the oil separator with the clip.
  5. Install the oil separator cap cover (11).
  6. Install the oil separator body cover (7). Refer to Oil Separator Body Cover Replacement.
  7. Install the engine harness clip (15) attached to the oil separator bracket (14).