NO.16 ENGINE NOISE [WLT-1, WLT-2]
id010396913600
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16
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Engine noise
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DESCRIPTION
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• Engine noise from under the hood
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POSSIBLE CAUSE
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• Engine internal damage
• Timing belt displacement
• Injection nozzle malfunction
• Loose attaching bolts or worn parts
• Improper drive belt tension
• Air leakage from intake-air system
• Turbocharger operating noise
• EGR system malfunction
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Diagnostic procedure
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STEP |
INSPECTION |
ACTION |
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1
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• Remove parts necessary to inspect the turbocharger.
• Inspect if the turbocharger compressor wheel is bent, damaged, or interfering with the casing on vehicle.
• Is there any problem?
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Yes
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Replace the turbocharger.
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No
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Go to the next step.
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2
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• Inspect if the turbocharger compressor wheel locknut is loose or has fallen down the inside turbocharger.
• Is there any problem?
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Yes
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Replace the turbocharger.
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No
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Go to the next step.
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3
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• Turn the turbocharger compressor wheel by hand.
• Does the wheel turn easily and smoothly?
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Yes
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Go to the next step.
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No
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Replace the turbocharger.
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4
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• Inspect if the turbocharger turbine wheel is damaged, cracked or interfering with the housing on vehicle.
• Is there any problem?
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Yes
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Replace the turbocharger.
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No
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Go to the next step.
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5
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• Is any engine oil found inside the turbocharger turbine housing?
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Yes
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Excessive amount of oil is found:
• Replace the turbocharger.
Small amount of oil is found:
• Wipe oil out of the vehicle, then, go to the next step.
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No
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Go to the next step.
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6
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• Is any engine oil found inside the turbocharger compressor housing?
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Yes
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Wipe oil out of the vehicle.
Go to the next step.
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No
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Go to the next step.
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7
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• Is any exhaust gas leakage found around the location where center turbocharger is attached to the exhaust manifold?
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Yes
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Remove the turbocharger.
Inspect for cracks on the center housing inlet surface.
If cracks are found, replace the turbocharger.
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No
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Go to the next step.
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8
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• Are any center housing and turbine housing attaching bolts loose?
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Yes
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Retighten loose bolts.
If a bolt is found to be missing, install the appropriate new bolt.
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No
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The turbocharger is normal.
Install all removed the parts in Step 11.
Go to the next step.
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9
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• Is there a squeal, click or chirp sound present?
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Yes
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Inspect engine the oil level or drive belts.
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No
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Go to the next step.
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10
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• Is there a rumble or grinding sound present?
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Yes
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Inspect the drive belt.
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No
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Go to the next step.
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11
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• Is there a rattle sound present?
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Yes
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Inspect the location of the rattle some for loose parts.
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No
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Go to the next step.
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12
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• Is there a hiss sound present?
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Yes
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Inspect for vacuum leakage.
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No
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Go to the next step.
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13
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• Is there a rap or roar sound present?
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Yes
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Inspect the exhaust system for loose parts.
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No
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Go to the next step.
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14
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• Inspect the injection timing.
• Is the injection timing normal?
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Yes
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Go to the next step.
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No
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Inspect the TCV.
If the TCV is normal, adjust the injection timing.
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15
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• Carry out EGR system inspection.
• Is the EGR system normal?
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Yes
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Go to the next step.
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No
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Repair or replace as necessary.
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16
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• Remove the injection nozzle.
• Inspect the injection nozzle for the following:
• Is the injection nozzle normal?
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Yes
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Go to the next step.
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No
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Clogged nozzle or seized needle valve:
• Disassemble and clean or replace the injection nozzle.
Incorrect valve opening pressure:
• Adjust injection nozzle opening pressure.
Malfunctioning nozzle gasket:
• Replace nozzle gasket.
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17
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• Verify the test results. If normal, return to the diagnostic index to service any additional symptoms.
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