GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2004 🢒 TopKick C-Series (Conventional) C4/C5 🢒 Engine 🢒 Engine Mechanical - 6.6L (LLY) 🢒 Turbocharger Lack of Oil Supply

Turbocharger Lack of Oil Supply for GMC Truck TopKick C-Series (Conventional) C4/C5 2004

Condition

Action

Restricted oil supply hose

Inspect for restricted turbocharger oil supply hose.

Spun camshaft bearing
  1. Remove the oil supply hose. Refer to Turbocharger Oil Feed Pipe Replacement .
  2. Visually inspect for correct alignment of the camshaft bearing oil hole.
  3. Rotate the engine 1/2 turn and inspect the camshaft bearing oil hole for movement, indicating a spun camshaft bearing.