16-NA-085

Bulletin No.: 16-NA-085
Date: Jun-2016
Subject:
Brand:
Buick
Buick
New Design Cylinder Heads
Model:
Model Year:
VIN:
from
to
Allure (Canada
Only)
2007
2011
LaCrosse
2007
from
Engine:
to
LAU (2.8L)
LF1 (3.0L)
LFW (3.0L)
2011
LLT (3.6L)
Buick
Enclave
2008
2011
Cadillac
CTS
2007
2011
LY7 (3.6L)
SRX
STS
Chevrolet
Equinox
2008
2011
Chevrolet
Malibu
2008
2011
Chevrolet
Traverse
2009
2011
Chevrolet
Camaro
2010
2011
GMC
Acadia
2007
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
1
Transmission:
Involved Region or Country
North America
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.
If replacing the cylinder heads for damage caused by the thrust washers, the cylinder heads must be replaced with a newly designed cylinder head.
Previously Designed Cylinder Heads used a thrust washer (1) between the actuators and cylinder heads.
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
2
Note: If replacing any of the actuators, the 4 bolt Delphi actuators are compatible to work with the 5 bolt Aisin actuators.
Description
Part Number
Qty
ACTUATOR, CM/SHF POSN (EXHAUST)
Refer to the Parts Catalog for
Vehicle Application
1
ACTUATOR, CM/SHF POSN (INTAKE)
1
Head, Cyl
1
Warranty Information
Labor Operation
Description
Labor Time
4061790
Cylinder Head Replacement - Left Side
Use Published Labor Operation
Time
4061770
Cylinder Head Replacement - Right Side
Version
3
Modified
May 9, 2016 – Update the Correction section, added detail to cylinder head graphics and removed the
reference to Bulletin 08–06–01–011.
June 13, 2016 – Updated procedure and added a note for Actuator compatibility.
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.
WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION
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