GM Service Manual Online
For 1990-2009 cars only

Turbocharger Coolant Bypass Valve Replacement 6.6L LLY

Removal Procedure

  1. Remove the air cleaner. Refer to Air Cleaner Replacement for the 6.6L (LLY) engine.
  2. Drain the cooling system. Refer to Cooling System Draining and Filling .
  3. Reposition the coolant inlet hose clamp.
  4. Disconnect the turbocharger coolant inlet hose from the turbocharger bypass valve.

  5. Object Number: 687052  Size: SH
  6. Remove the turbocharger bypass valve and washer.

Installation Procedure

    Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 687052  Size: SH
  1. Install the turbocharger bypass valve and washer.
  2. Tighten
    Tighten the valve to 60 N·m (44 lb ft).


    Object Number: 1335386  Size: SH
  3. Connect the turbocharger coolant inlet hose to the turbocharger bypass valve.
  4. Position the coolant inlet hose clamp.
  5. Install the air cleaner. Refer to Air Cleaner Replacement for the 6.6L (LLY) engine.
  6. Fill the cooling system. Refer to Cooling System Draining and Filling .