Workshop Repair and Service Manuals GMC SIERRA

PI0630 Service and Maintenance on Vehicles with Underbody Engine Compartment Shields - (Dec 13 2011)


Subject:Service and Maintenance on Vehicles with Underbody Engine Compartment Shields

#PI0630: Service and Maintenance on Vehicles with Underbody Engine Compartment Shields - (Dec 13, 2011)

Models: 2013 and Prior GM Passenger Cars and Trucks

Many new vehicles are being produced with full shields under the engine compartment(commonly referred to as “belly pans” or “splash shields”). These shields are beingintroduced to help meet vehicle noise regulations in certain markets, especially forvehicles equipped with diesel engines. The shield may also incorporate features tohelp aerodynamics and to provide splash and debris intrusion protection.

Technicians are always careful to ensure that combustible materials such as spilledfluids, solvents, pads and rags, paper records and manuals are not left in the enginecompartment after maintenance. This is even more important when servicing a vehiclewith a full shield under the engine compartment. With such a shield, there is an increasedchance that any spilled or dropped materials will remain in the engine compartmentand createa risk for a thermal event – smoke, odor, melting or perhaps even a fire.

To reduce this risk, the technician should consider:

Removing the engine compartment underbody shield entirely before performing servicework (including oil and filter changes), and reinstall it after all service is completed.This may not be practical in all circumstances, but it is the most effective way toensure that the shield does not trap any spilled or dropped materials.Avoid placing pads or rags on the engine compartment underbody shield to catch spills,if the shield is not removed during maintenance. These pads or rags might accidentallybe left in the vehicle after maintenance is complete.Wiping any small spills with a single rag, ensuring that the rag is removed from theengine compartment when finished.Avoid the use of flammable solvents to clean any incidental spills. These solvents,such as brake or carburetor cleaner, can collect in the engine compartment shieldand create additional risk for a thermal event.Using only soap and water to clean any incidental spills. If the spill is extensive,consider removing the shield to clean it thoroughly.

GM bulletins are intended for use by professional technicians,NOT a "do-it-yourselfer".  They are written to inform thesetechnicians of conditions that may occur on some vehicles, or toprovide information that could assist in the proper service of avehicle.  Properly trained technicians have the equipment,tools, safety instructions, and know-how to do a job properly andsafely.  If a condition is described, DO NOT assume that thebulletin applies to your vehicle, or that your vehicle will havethat condition.  See your GM dealer for information on whetheryour vehicle may benefit from the information.

#PI0630: Service and Maintenance on Vehicles with Underbody Engine Compartment Shields - (Dec 13, 2011)


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