Engine - New In-Vehicle Cylinder Head Service Procedure: Overview
INFORMATIONBulletin No.: 06-06-01-017G
Date: February 16, 2009
Subject:
Information On New In-Vehicle Service Procedure for Removal/Installation of LK5 or L52 Cylinder Head
Models:
2004-2006 Chevrolet Colorado
200-42006 GMC Canyon
2006 HUMMER H3
with Vortec(TM) 2.8L I4, 3.5L I5 Engine (VINs 8, 6 - RPOs LK5, L52)
Supercede:
This bulletin is being revised to update step 53, add step 54 of the removal procedure and update step 8, add step 9 of the installation procedure. Please discard Corporate Bulletin Number 06-06-01-017F (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.
Important:
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 tools shown above will be required to perform this new service procedure outlined in this bulletin.
SI Documents
Before starting this new service procedure outlined in this bulletin, refer to the SI documents shown above and review. Print the SI documents with an asterisk (*) next to the document. The asterisk indicates additional service information shown in this bulletin.
Parts Information
Warranty Information
Disclaimer