I just recently had my motor replaced by extended warranty company. At the time i also had the new style valve cover installed. Whats the bulletin number? This way i can give the warranty company in writing why that was replaced.
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Some customers may complain of engine oil consumption.
This may be the result of oil ingestion through the PCV system and/or stuck piston rings.
If this complaint is encountered, perform an oil consumption test as outlined in the latest version of 01-06-01-011 to determine if the oil consumption is greater than 0.946 L (1 qt) in 3,200 km (2,000 mi).
If the oil consumption is greater than 0.946 L (1 qt) in 3,200 km (2,000 mi) but there are no oil leaks present and SI diagnosis does not isolate the cause of this concern, perform the following suggestions as necessary:
1. A correctly functioning PCV system will only leave a film of oil in the intake manifold. Inspect the inside of the intake manifold to see if there is any oil puddling in the bottom. If there is, you will need to replace the left valve cover with the latest part number listed in the parts catalog, which has been updated to include a relocated PCV drain hole that prevents oil from entering the intake manifold.
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2. If excessive oil in the intake is not found, follow the suggestions below to free the piston rings.
2.1. Remove the spark plugs and ensure that none of the pistons are at top dead center (TDC).
2.2. 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 the engine over. Make sure to unplug the ignition coils and fuel injectors before cranking the engine over. Also make sure that the painted surfaces are covered so no damage is done.
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.
2.3. Reinstall the spark plugs. Replace the spark plugs if necessary due to full of carbon. Refer to the parts catalog.
2.4. 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 (2,000 mi), replacement of the pistons and rings will be required.
Important: Some minor scratches may be noticed on the cylinder walls during piston and ring replacement. If the scratch cannot be felt when running your finger nail over it, the scratch is considered normal wear and the block or engine should not be replaced.
Note: It is not necessary to hone or deglaze the cylinder walls. Honing may induce unnecessary cylinder wall and/or piston ring damage if it is done incorrectly and/or not cleaned thoroughly. Cylinder walls should be cleaned thoroughly with brake cleaner before installation of the new pistons and rings. Numerous engines replaced for oil consumption have been inspected. The cross hatch has been consistently good and is in specification. As a result, is should not be necessary to measure the cylinders if they pass the visual inspection.
Note: The LH6 engine found in this vehicle has a different oil pan and AFM lubrication system as compared with the LH6 engine found in the Full Size Trucks. As a result, the AFM shield that is described in the latest version of 10-06-01-008 for Full Size Trucks cannot be installed.
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Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.