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OIL PRESSURE DIAGNOSIS AND TESTING Allow adequate time for the rings to seat. Replace worn piston rings as necessary. Piston and rings improperly installed or improperly fit to Step Action Yes No DEFINITION: Low or no engine oil pressure indicates a potentially serious condition with 1 Check engine oil level. Use only the GM service Go to Step 2 - 2 1. Operate vehicle until engine reaches normal operating temperature. Refer to Engine 2. Park vehicle on a level surface. 3. Wait 15 minutes. 4. Check engine oil level. Use only the GM service parts brand and recommended Is the engine oil level between ADD and FULL Go to Step 3 - 3 Operate the engine and measure the engine oil System OK Go to Step 4 1. Remove the oil pressure sender or engine block oil gallery plug. 2. Install a mechanical oil pressure gage.
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Mechanical - 6.6L - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
4 3. Operate the engine and measure the engine oil pressure with the mechanical oil Is engine oil pressure within specification? System OK Go to Step 5 5 Change the engine oil and filter. Use only the GM service parts brand and Use only the GM service parts brand and System OK Go to Step 6 6 1. Inspect the engine for mechanical damage. Special interest should be shown to the Malfunctioning oil bypass valve Oil pump worn or dirty Oil pump-to-engine block bolts loose Oil pump O-ring damaged or missing Oil pump to oil pump pipe and screen Oil pump pipe and screen assembly Oil pump driven gear damaged or Oil pump drive gear damaged Oil cooler restrictions Oil cooler O-rings damaged or
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Mechanical - 6.6L - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
OIL LEAK DIAGNOSIS missing Excessive bearing clearances Cracked, porous or restricted oil Oil gallery plugs missing or Damaged or missing oil spray cooling 2. Inspect the engine for customer modifications. Is there mechanical damage, or customer Go to Step 7 Go to Step 1 7 Repair or replace all damaged or modified Go to Step 1 - 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. Check for drippings. Are drippings present? Go to Step 2 System OK 2 Can you identify the type of fluid and the Go to Step 7 Go to Step 3 1. Visually inspect the suspected area. Use a small mirror to assist in looking at hard to
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Mechanical - 6.6L - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
3 2. Check 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 7 Go to Step 4 4 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 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 7 Go to Step 5 5 Use J 28428-E in order to identify the type of Go to Step 7 Go to Step 6 6 1. Visually inspect the suspected area. Use a small mirror to assist in looking at hard to 2. Check 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 7 System OK
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Mechanical - 6.6L - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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