16NA085

File in Section:
Bulletin No.:
Service Bulletin
Date:
16-NA-085
November, 2017
INFORMATION
Subject:
New Design Cylinder Heads
Brand:
Model:
Buick
Model Year:
VIN:
from
to
Allure
(Canada
Only)
2007
2011
Buick
LaCrosse
2007
2011
Buick
Enclave
2008
2011
2007
2011
from
Engine:
Transmission:
to
CTS
Cadillac
SRX
Chevrolet
Equinox
2008
2011
Chevrolet
Malibu
2008
2011
Chevrolet
Traverse
2009
2011
Chevrolet
Camaro
2010
2011
Acadia
2007
2011
STS
GMC
Terrain
2010
2011
Pontiac
G6
2007
2009
Pontiac
G8
2008
2009
Pontiac
Torrent
2008
2009
Saturn
AURA
2007
2009
Saturn
OUTLOOK
2007
2010
Saturn
VUE
2008
2010
LAU (2.8L)
LF1 (3.0L)
LFW (3.0L)
LLT (3.6L)
LY7 (3.6L)
Involved Region or Country
North America and N.A. Export Regions
Condition
Technicians may have additional questions when replacing cylinder heads with the new
saddle cap design head.
Cause
The camshaft actuator thrust bearings may have caused damage to the cylinder heads,
creating debris.
Note: The new style saddle cap designed cylinder
heads will not work with the 2004-2006 and first
design 2007 engines.
Correction
Caution: If you are using a 2011 new style "saddle
cap" cylinder head, thrust washers are not to be
used. The use of thrust washers on the new
designed cylinder heads can cause damage to the
cam shaft actuator, saddle cap and cylinder head.
Copyright 2017 General Motors LLC. All Rights Reserved.
If replacing the cylinder heads for damage caused by
the thrust washers, the cylinder heads must be
replaced with a newly designed cylinder head.
Page 2
November, 2017
Bulletin No.: 16-NA-085
The new cylinder heads have a saddle cap (2), which
incorporated a thrust surface on the saddle cap, has
been designed to reduce the tolerance between the
camshaft actuator and cylinder head, eliminating the
need for a thrust washer.
Service Procedure
If replacing the previous design cylinder heads with the
newly designed heads, perform Cylinder Head
Replacement per SI.
Parts Information
Note: If replacing any of the actuators, the 4 bolt
Delphi actuators are compatible to work with the 5 bolt
Aisin actuators.
Description
ACTUATOR, CM/SHF
POSN (EXHAUST)
4509309
Previously Designed Cylinder Heads used a thrust
washer (1) between the actuators and cylinder heads.
ACTUATOR, CM/SHF
POSN (INTAKE)
Head, Cyl
Part
Number
Qty
Refer to the
Parts
Catalog for
Vehicle
Application
1
1
1
Warranty Information
For vehicles repaired under warranty, use:
Labor
Operation
Description
Labor Time
4061790
Cylinder Head Replacement
- Left Side
4061770
Cylinder Head Replacement
- Right Side
Use
Published
Labor
Operation
Time
4509294
Version
4
Modified
May 9, 2016 - Updated the Correction section, added detail to cylinder head graphics and
removed the reference to Bulletin 08-06-01-011.
June 13, 2016 - Updated the procedure and added a Note for actuator compatibility.
November 22, 2017 - Added GMC Terrain to the Model section.
GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these
technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper
service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a
job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your
vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the
information.
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