Engine - In-Vehicle Cylinder Head Service Procedure: Overview
Bulletin No.: 06-06-01-017CDate: January 16, 2007
INFORMATION
Subject:
Information On New In-Vehicle Service Procedure for Removal/Installation of LK5, L52, LLV, LLR or LL8 Cylinder Head
Models:
2004-2007 Buick Rainier
2002-2007 Chevrolet TrailBlazer Models
2004-2007 Chevrolet Colorado
2002-2007 GMC Envoy Models
2004-2007 GMC Canyon
2002-2004 Oldsmobile Bravada
2006-2007 HUMMER H3
2005-2007 Saab 9-7X
with Vortec(TM) 2.8L I-4, 2.9L I-4, 3.5L I-5, 3.7L I-5 or 4.2L I-6 Engine (VINs 8, 9, 6, E, S - RPOs LK5, LLV, L52, LLR, LL8)
Supercede:
This bulletin is being revised to include additional part information for 2002-2005 cylinder head replacement for the 4.2L LL8 engine. Please discard Corporate Bulletin Number 06-06-01-017B (Section 06 - Engine/Propulsion System).
The following new service information outlined in this bulletin will aid technicians in removal and installation of the cylinder head without the removal of the front engine cover. The new service procedure can be done in vehicle with the aid of a new General Motors special service tool part number EN-48464 - Lower Timing Gear Tensioner Holding Tool.
If the Lower Timing Gear Tensioner Holding Tool is not wedged correctly, the front cover will have to be removed to reset the timing chain tensioner. The Lower Timing Gear Tensioner Holding Tool will wedge between the timing chain tensioner and the front cover center bolt. When wedged in place, this will allow the camshafts or cylinder head to be serviced or removed without the removal of the front cover to reset the timing chain tensioner.
It is very important to make sure when timing the engine that all your timing marks align; there is no margin for error. If timed incorrectly, damage to the engine may occur or a DTC P0017 may set (PCM uses the crankshaft position (CKP) sensor and the exhaust camshaft position (CMP) sensor information to monitor the correlation between the crankshaft and camshaft positions).
Tools Required
The following tools will be required to perform this new service procedure outlined in this bulletin:
EN-48464 - Lower Timing Gear Tensioner Holding Tool
EN-46547 - Flywheel Holding Tool (LK5 or L52 Engine Only)
J 44221 - Camshaft Holding Tool
J 45059 - Torque Angle Meter
TDC Indicator Tool (Some models may use a dial Indicator or graduation marks on the side of a sliding shaft for visual indication)
Parts Information (2.8L I-4 LK5 Engine or 2.9L I-4 LLV Engine)
Parts Information (3.5L I-5 L52 Engine or 3.7L I-5 LLR Engine)
Parts Information (4.2L I-6 LL8 Engine)
The Part Information shown unless stated is for the 2006-2007 4.2L LL8 engines only. The 2006 and newer cylinder head and related components will not work on 2002-2005 engines. All replacement cylinder heads have been up-graded with the new materials.
Warranty Information (excluding Saab U.S Models)
For vehicles repaired under warranty, use the table.
Warranty Information (Saab U.S. Models)
For vehicles repaired under warranty, use the table.
Disclaimer