PRE-RELEASE
Symptoms - Engine Mechanical
| Symptoms - Engine Mechanical |
| Strategy Based Diagnostics |
| 1. |
Perform the
Diagnostic System Check - Vehicle
before using the symptom tables, if applicable.
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| 2. |
Review the system operation in order to familiarize yourself with the system functions. Refer to
Disassembled Views
,
Engine Component Description
, and
Lubrication Description
.
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All diagnosis on a vehicle should follow a logical process. Strategy based diagnostics is a uniform approach for repairing all systems. The diagnostic flow may always be used in order to resolve a system condition. The diagnostic flow is the place to start when repairs are necessary.
| Visual/Physical Inspection |
| • |
Inspect for aftermarket devices which could affect the operation of the engine.
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| • |
Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.
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| • |
Inspect for the correct oil level, proper oil viscosity, and correct filter application.
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Verify the exact operating conditions under which the concern exists. Note factors such as engine RPM, ambient temperature, engine temperature, amount of engine warm-up time, and other specifics.
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| • |
Compare the engine sounds, if applicable, to a known good engine and ensure you are not trying to correct a normal condition.
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| Intermittent |
Test the vehicle under the same conditions that the customer reported in order to verify the system is operating properly.
| Symptom List |
Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:
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Base Engine Misfire without Internal Engine Noises
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Base Engine Misfire with Abnormal Internal Lower Engine Noises
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Base Engine Misfire with Abnormal Valve Train Noise
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Base Engine Misfire with Coolant Consumption
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Base Engine Misfire with Excessive Oil Consumption
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Engine Noise on Start-Up, but Only Lasting a Few Seconds
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Upper Engine Noise, Regardless of Engine Speed
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Lower Engine Noise, Regardless of Engine Speed
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Engine Noise Under Load
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Engine Will Not Crank - Crankshaft Will Not Rotate
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Engine Compression Test
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Oil Consumption Diagnosis
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Oil Pressure Diagnosis and Testing
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Oil Leak Diagnosis
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Fuel in Engine Oil
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Drive Belt Chirping, Squeal, and Whine Diagnosis
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Drive Belt Rumbling and Vibration Diagnosis
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Drive Belt Falls Off and Excessive Wear Diagnosis
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Drive Belt Tensioner Diagnosis
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Turbocharger Lack of Oil Supply
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Turbocharger Oil Leak From Compressor Seal
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Turbocharger Oil Leak From Turbine Seal
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Turbocharger Whine Noise
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Turbocharger Hissing Noise
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