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OIL LEAK DIAGNOSIS Step Action Yes No IMPORTANT: You can repair most fluid leaks by first visually locating the leak, repairing or replacing the 1 1. Operate the vehicle until it reaches normal operating temperature. 2. Park the vehicle on a level surface, over a large sheet of paper or other clean surface. 3. Wait 15 minutes. 4. Inspect for drippings. Are drippings present? Go to Step 2 System OK 2 Can you identify the type of fluid and the Go to Step 10 Go to Step 3 3 1. Visually inspect the suspected area. Use a small mirror to assist in looking at hard to 2. Inspect for leaks at the following locations: Sealing surfaces Fittings Cracked or damaged components Can you identify the type of fluid and the Go to Step 10 Go to Step 4 4 1. Completely clean the entire engine and surrounding components. 2. Operate the vehicle for several kilometers, miles, at normal operating temperature and 3. Park the vehicle on a level surface, over a large sheet of paper or other clean surface. 4. Wait 15 minutes. 5. Identify the type of fluid, and the
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado
approximate location of the leak. Can you identify the type of fluid and the Go to Step 10 Go to Step 5 5 1. Visually inspect the suspected area. Use a small mirror to assist in looking at hard to 2. Inspect for leaks at the following locations: Sealing surfaces Fittings Cracked or damaged components Can you identify the type of fluid and the Go to Step 10 Go to Step 6 6 1. Completely clean the entire engine and surrounding components. 2. Apply an aerosol-type powder, baby powder, foot powder, etc., to the suspected 3. Operate the vehicle for several kilometers, miles, at normal operating temperature and 4. Identify the type of fluid, and the approximate location of the leak, from the Can you identify the type of fluid and the Go to Step 10 Go to Step 7 7 1. Visually inspect the suspected area. Use a small mirror to assist in looking at hard to 2. Inspect for leaks at the following locations: Sealing surfaces Fittings Cracked or damaged components
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado
Can you identify the type of fluid and the Go to Step 10 Go to Step 8 8 Use the J 28428-E high intensity black light kit Go to Step 10 Go to Step 9 9 1. Visually inspect the suspected area. Use a small mirror to assist in looking at hard to 2. Inspect for leaks at the following locations: Sealing surfaces Fittings Cracked or damaged components Can you identify the type of fluid and the Go to Step 10 System OK 10 1. Inspect the engine for mechanical damage. Special attention should be shown to the Higher than recommended fluid levels Higher than recommended fluid Plugged or malfunctioning fluid filters Plugged or malfunctioning engine 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
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado
CRANKCASE VENTILATION SYSTEM INSPECTION/DIAGNOSIS Results Of Incorrect Operation A plugged positive crankcase ventilation (PCV) orifice or hose may cause the following Rough idle Stalling or slow idle speed Oil leaks Oil in air cleaner Sludge in engine A leaking PCV orifice or hose may cause the following conditions: Rough idle Stalling High idle speed Functional Check With these systems, any blow-by in excess of the system capacity, from a badly worn engine, Proper operation of the crankcase ventilation system depends upon a sealed engine. If oil slugging If an engine is idling rough, inspect for a clogged PCV orifice, a dirty vent filter, air cleaner 1. Remove the PCV hose from the rocker arm cover. 2. Operate the engine at idle. 2. Inspect the engine for customer modifications. Is there mechanical damage, or customer Go to Step 11 System OK 11 Repair or replace all damaged or modified Go to Step 1 System OK
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado
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