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CRANKCASE VENTILATION SYSTEM INSPECTION/DIAGNOSIS 7 1. Inspect the engine for mechanical damage and repair or replace as necessary. Special Plugged or malfunctioning crankcase Higher than recommended fluid levels Higher than recommended fluid Plugged or malfunctioning fluid filters Improperly tightened or damaged Cracked or porous components Improper sealants or gaskets where Improper sealant or gasket installation Damaged or worn gaskets or seals Damaged or worn sealing surfaces 2. Inspect the engine for customer modifications. Is there mechanical damage, or customer Go to Step 8 System OK 8 Repair or replace all damaged or modified Go to Step 1 System OK Concern Action IMPORTANT: Oil in the charged air cooler, hoses, turbocharger, or intake manifolds is normal with a closed
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Mechanical - 6.6L - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
DRIVE BELT CHIRPING, SQUEAL, AND WHINE DIAGNOSIS Diagnostic Aids A chirping or squeal noise may be intermittent due to moisture on the drive belts or the If the noise is intermittent, verify the accessory drive components by varying their loads A chirping, squeal or whine noise may be caused by a loose or improper installation of a The drive belts will not cause a whine noise. Test Description The numbers below refer to the step numbers on the diagnostic table. 2: The noise may not be engine related. This step is to verify that the engine is making the 3: The noise may be an internal engine noise. Removing the drive belts one at a time and 4: Inspect all drive belt pulleys for pilling. Pilling is the small balls or pills or it can be 6: Misalignment of the pulleys may be caused from improper mounting of the accessory The maximum crankcase pressure is 4 kPa or 16 in of water at 3,100 RPM measured at the PVC check valve stuck Excessive crankcase pressure Possible oil leaks. Replace the valve. Odors Normal situation Noise Cracked hoses Smoke Damaged PCV diaphragm Excessive Oil Consumption Damaged PCV diaphragm, missing or broken spring
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Mechanical - 6.6L - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
drive component, incorrect installation of the accessory drive component pulley, or the 10: Inspecting of the fasteners can eliminate the possibility that a wrong bolt, nut, spacer, or 12: Inspecting the pulleys for being bent should include inspecting for a dent or other 14: This test is to verify that the drive belt tensioner operates properly. If the drive belt 15: This test is to verify that the drive belt is not too long, which would prevent the drive 16: Misalignment of the pulleys may be caused from improper mounting of the accessory 17: This test is to verify that the pulleys are the correct diameter or width. Using a known 19: Replacing the drive belt when it is not damaged or there is not excessive pilling will Step Action Yes No DEFINITION: The following items are indications of chirping: A high pitched noise that is heard once per revolution of the drive belt or a pulley. Chirping may occur on cold damp start-ups and will subside once the vehicle reaches NOTE: Refer to Belt Dressing Notice .
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Mechanical - 6.6L - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
DEFINITION: The following items are indications of drive belt squeal: A loud screeching noise that is caused by a slipping drive belt. This is unusual for a The noise occurs when a heavy load is applied to the drive belt, such as an air DEFINITION: The following items are indications of drive belt whine: A high pitched continuous noise. The noise may be caused by an accessory drive component failed bearing. 1 Did you review the drive belt symptom Go to Step 2 Go to Symptoms 2 Verify that there is a chirping, squeal or whine Go to Step 3 Go to Diagnostic 3 1. Remove the drive belt. If the engine has multiple drive belts, 2. Operate the engine for no longer than 30- 40 seconds. 3. Repeat this test if necessary by removing the remaining belt(s). Does the chirping, squeal or whine noise still Go to Symptoms Go to Step 4 4 If diagnosing a chirping noise, inspect for
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Mechanical - 6.6L - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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