K 3500 Truck 4WD V8-6.6L DSL Turbo VIN 1 (2001)
Camshaft Bearing: Technical Service Bulletins
Engine - Turbocharger Lubrication Issues
INFORMATION
Bulletin No.: 03-06-93-001D
Date: October 09, 2008
Subject:
Diagnostic Information on Turbocharger Malfunction Due to Lack of Engine Oil for LBZ, LB7, LLY or LMM Duramax(TM) Diesel Engine
Models:
2001-2009 Chevrolet Silverado
2003-2009 Chevrolet Kodiak C4500-C5500 Series
2006-2009 Chevrolet Express
2001-2009 GMC Sierra
2003-2009 GMC TopKick C4500-C5500 Series
2006-2009 GMC Savana
with 6.6L Duramax(TM) V8 Diesel Engine (VINs D, 1, 2, 6 RPOs LBZ, LB7, LLY, LMM)
Supercede:
This bulletin is being revised to add model years. Please discard Corporate Bulletin Number 03-06-93-001C (Section 06 - Engine/Propulsion System).
Notice:
Before installing a new turbocharger, clean any debris or excessive oil from the charge air cooler and intake system in order to prevent damage to the
new turbocharger or an engine overspeed condition.
Spun Camshaft Bearing
If a turbocharger performance concern is thought to be caused from a deficiency of engine oil, the camshaft bearing should be checked. The number 4
camshaft bearing bore feeds the turbocharger engine oil supply hose. If this camshaft bearing spins in the bore, the turbocharger will be deprived of
engine oil. This will cause a performance concern with the turbocharger. Incorrect diagnosis of this condition will result in a repeat performance concern
with the turbocharger.
Camshaft Bearing Inspection
If the turbocharger has to be replaced, perform the following procedure in order to verify the condition of the number 4 camshaft bearing before
installing a new turbocharger.
1.
Remove the turbocharger. Refer to Service Information (SI) procedures for Turbocharger Replacement.
2.
Remove the turbocharger oil supply hose.
3.
Visually inspect for correct alignment of the number 4 camshaft bearing oil hole (Refer to illustration callout 4) through the turbocharger oil
supply hole in the block (Refer to illustration callout 1). The camshaft journal oil groove (Refer to illustration callout 3) should be visible through
the camshaft bearing oil hole (Refer to illustration callout 4).
4.
Turn the engine over by hand a 1/2 turn. The camshaft journal oil groove (Refer to illustration callout 3) should still be visible through the
