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Symptoms - Engine Mechanical

Symptoms - Engine Mechanical

Strategy Based Diagnostics


1. Perform the Diagnostic System Check - Vehicle before using the symptom tables, if applicable.

2. Review the system operation in order to familiarize yourself with the system functions. Refer to Disassembled Views (LDK, LHU) , Engine Component Description (LDK, LHU) , and Lubrication Description .


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.

• Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.

• Inspect for the correct oil level, proper oil viscosity, and correct filter application.

• 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.

• Compare the engine sounds, if applicable, to a known good engine and ensure you are not trying to correct a normal condition.


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:


• Base Engine Misfire without Internal Engine Noises (LDK, LHU)

• Base Engine Misfire with Abnormal Internal Lower Engine Noises (LDK, LHU)

• Base Engine Misfire with Abnormal Valve Train Noise (LDK, LHU)

• Base Engine Misfire with Coolant Consumption (LDK, LHU)

• Base Engine Misfire with Excessive Oil Consumption (LDK, LHU)

• Engine Noise on Start-Up, but Only Lasting a Few Seconds (LDK, LHU)

• Upper Engine Noise, Regardless of Engine Speed (LDK, LHU)

• Lower Engine Noise, Regardless of Engine Speed (LDK, LHU)

• Engine Noise Under Load (LDK, LHU)

• Engine Will Not Crank - Crankshaft Will Not Rotate (LDK, LHU)

• Coolant in Combustion Chamber (LDK, LHU)

• Coolant in Engine Oil (LDK, LHU)

• Turbocharger Whine Noise (LDK, LHU)

• Turbocharger Hissing Noise (LDK, LHU)

• Turbocharger Oil Leak From Compressor Seal (LDK. LHU)

• Turbocharger Oil Leak From Turbine Seal (LDK, LHU)

• Turbocharger Lack of Oil Supply (LDK. LHU)

• Engine Compression Test

• Cylinder Leakage Test

• Oil Consumption Diagnosis

• Oil Pressure Diagnosis and Testing

• Oil Leak Diagnosis

• Crankcase Ventilation System Inspection/Diagnosis (With Turbocharger)

• Drive Belt Chirping, Squeal, and Whine Diagnosis

• Drive Belt Rumbling and Vibration Diagnosis

• Drive Belt Falls Off and Excessive Wear Diagnosis

• Drive Belt Tensioner Diagnosis