Engine Mechanical - 5.3L L84 or 6.2L L87 | Diagnostic Information and Procedures | Document ID: 5617539
Lower Engine Noise, Regardless of Engine Speed
Lower Engine Noise, Regardless of Engine Speed
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Cause |
Correction |
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Low oil pressure |
1. Perform an oil pressure test. Oil Pressure Diagnosis and Testing 2. Repair or replace damaged components, as required. |
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Worn accessory drive components Abnormalities such as severe cracking, bumps or missing areas in the accessory drive belt and/or misalignment of system components. |
1. Inspect the accessory drive system. 2. Repair or replace, as required. |
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Loose or damaged crankshaft balancer |
1. Inspect the crankshaft balancer. 2. Repair or replace, as required. |
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Detonation or spark knock |
Verify the correct operation of the ignition controls system. Symptoms - Engine Mechanical |
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Loose torque converter bolts |
1. Inspect the torque converter bolts and flex plate. 2. Repair or replace, as required. |
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Loose or damaged flywheel or flex plate |
Repair or replace the flywheel or flex plate. |
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Oil pump screen loose, damaged, or restricted |
1. Inspect the oil pump screen. 2. Repair or replace, as required. |
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Excessive piston-to-cylinder bore clearance |
1. Inspect the piston and cylinder bore. Engine Mechanical Specifications 2. Repair, as required. |
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Excessive piston pin-to-bore clearance |
1. Inspect the piston, pin, and connecting rod. 2. Replace the piston and pin as an assembly, as required. Engine Mechanical Specifications |
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| Cause |
Correction |
| Excessive connecting rod bearing clearance |
Inspect the following components and repair, as required: The connecting rod bearings The connecting rods The crankshaft The crankshaft journals Engine Mechanical Specifications |
| Excessive crankshaft bearing clearance |
Inspect the following components and repair, as required: The crankshaft bearings The crankshaft journals The cylinder block crankshaft bearing bore Engine Mechanical Specifications |
| Incorrect piston, piston pin, and connecting rod installation Pistons must be installed with the mark or dimple on the top of the piston facing the front of the engine. Piston pins must be centered in the connecting rod pin bore. |
1. Verify the pistons, piston pins and connecting rods are installed correctly. Piston and Connecting Rod Removal and Installation 2. Repair, as required. |