Document ID: 2524100
#10-06-01-008: Engine Oil Consumption on Aluminum Block Engines with Active Fuel Management (AFM) (Install AFM Oil Deflector and Clean Carbon from Cylinder) - (Aug 24, 2010)
Subject:
Engine Oil Consumption on Aluminum Block Engines with Active Fuel Management (AFM) (Install AFM Oil Deflector and Clean Carbon from Cylinder)
Models:
2007-2008 Cadillac Escalade, Escalade ESV, Escalade EXT
2007-2008 Chevrolet Avalanche, Silverado 1500, Suburban, Tahoe
2007-2008 GMC Sierra 1500, Sierra Denali, Yukon, Yukon XL, Yukon Denali, Yukon Denali XL
2008 Pontiac G8 GT
Equipped with Aluminum Block V8 Engine with Active Fuel Management (AFM) (RPOs LC9, LH6, L76, LFA, L92)
with Greater than 45,000 km (28,000 mi)
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<H3 style="MARGIN: auto 0in">Condition</H3>
Some customers may comment about engine oil consumption on vehicles with 45,000-56,000 km (28,000-35,000 mi) or greater. Upon further investigation, a technician may find that the engine uses 0.946 L (1 qt) of oil in as little as 1,200 km (800 mi). After this bulletin is completed, the vehicle should be driven 3,200-4,800 km (2,000-3,000 mi), then tested for oil consumption again.
http://gsi.xw.gm.com/si/#ss2-2524100
<H3 style="MARGIN: auto 0in">Cause</H3>
This condition may be caused by an uncovered AFM valve that sprays oil on the bottom of the cylinders when the vehicle is in four cylinder mode. Over time, the rings cannot handle the volume and begin to stick with carbon. At that point, the vehicle oil usage may go up considerably.
http://gsi.xw.gm.com/si/#ss3-2524100
<H3 style="MARGIN: auto 0in">Correction</H3>
A new AFM shield/ring cleaning process has been developed to restore the function of the rings. If the oil economy has not improved to no more than 0.946 L (1 qt) of oil consumed in 3200 km (2000 mi) after cleaning, it may be necessary to replace all of the pistons and piston rings.
Important: It is critical in this cleaning process that the engine/fuel injector cleaner remain in the cylinders for a minimum of 2.5 hours to fully clean the components. The cleaner solution must be removed before a maximum of three hours.
Verify the oil consumption concern following Corporate Bulletin Number 01-06-01-011F. If oil consumption is found, continue on with this bulletin.
Remove the spark plugs and ensure that none of the pistons are at top dead center (TDC).
Clean the pistons by putting 118-147 ml (4-5 oz) of Upper Engine and Fuel Injector Cleaner, GM P/N 88861802 (in Canada, use 88861804), in each cylinder. Allow the material to soak for at least 2.5-3.0 hours, but no more than three hours and then remove the cleaner. A suggested method of removing the cleaner is cranking engine over. Make sure to unplug the ignition coils and fuel injector before cranking the engine over. Also make sure that the painted surfaces are covered so no damage is done.
Remove the oil pan. Refer to Oil Pan Replacement in SI.
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Remove the AFM valve (1).
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Install the new shield (1), GM P/N 12639759, and tighten the AFM valve to the oil pan to 28 N·m (20 lb ft).
Important: Ensure that the engine cleaner is thoroughly removed before reinstalling the spark plugs. Failure to do so may result in a hydro-lock condition.
Reinstall the spark plugs.
Reinstall the oil pan. Refer to the Oil Pan Installation procedure in SI.
Re-evaluate the oil consumption. Document on the repair order. If the oil consumption is still greater than 0.946 L (1 qt) in 3,200 km (2000 mi), replacement of the pistons and rings will be required.
http://gsi.xw.gm.com/si/#ss4-2524100
<H3 style="MARGIN: auto 0in">Parts Information</H3>
Part Number
Description
Qty
12639759
DEFLECTOR-OIL PRESS RLF VLV
1
88861802 (in Canada, use 88861804)
CLEANER, F/INJR 16 OZ LIQUID POUR (Upper Engine and Fuel Injector Cleaner)
3
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<H3 style="MARGIN: auto 0in">Warranty Information</H3>
For vehicles repaired under warranty, use:
Labor Operation
Description
Labor Time
J7555*
Install AFM Oil Deflector and Clean Carbon from Cylinder
3.5 hrs
Install AFM Oil Deflector and Clean Carbon from Cylinder (G8 Only)
10.5 hrs
*This is a unique labor operation for bulletin use only. It will not be published in the Labor Time Guide.
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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