Sorento 4WD V6-3.3L (2008)
Heat Shield: All Technical Service Bulletins
Engine/Exhaust - Various Noise Concerns
Model: Sedona[VQ], Amanti[GH], Sorento[BL]
Group: Engine Mechanical System(12)
Number: KT2007042402
Date: Tuesday, April 29, 2008
Area: N. America
Subject
3.8 LAMBDA Engine Noises (Engine -028- REVISED)
Description
This revised bulletin replaces information previously issued on June 1, 2007, Engine 028. It readdresses several noises on 3.8 or 3.3 litre engines used in
2006 and later Sedona (VQ) and 2007 and later Amanti (GH) and Sorento (BL). Three separate noises are covered.
Noise 1)
3.8/3.3I engines may exhibit noise for several seconds during initial start-up after sitting several hours, which typically sound like loose
timing chains or excessive bearing clearance.
Noise 2)
3.8/3.3I engines may exhibit noise during or after full warm-up, which can sound like excessive valve lash (valve tap) on one or more
cylinders - or - loose timing chains.
Noise 3)
In fewer cases, the catalyst heat shields may produce buzzing sounds that are most noticeable after full warm-up, and under slight engine
load.
This TSB will distinguish when and how to address these concerns. Please note that there have been changes to acceptable repair limits. Additionally
there have been changes to the repair procedures, which are provided in the service information on KGIS.
Noise 1 - Engine Noise Only at Initial Start-up
This can be caused by oil draining back into the crankcase after sitting several hours or after sitting overnight. Since the primary tension application of
the chain tensioners is oil pressure, the tensioners may initially have slack until significant oil reaches them and pressure begins to build. If the noise