Hyundai Sonata: Intake And Exhaust System / Turbo Charger Repair procedures
| Turbocharger Diagnostic Flow |
If any problem related with
turbocharger, such as lack of engine power, poor acceleration, abnormal
engine noise or oil leaks, may occur, check the turbocharger according
to the procedure as follows.
| 1. |
Check for assembling of the turbocharger and the exhaust fitting (or the after treatment).
| A. |
Check if a gasket is installed. |
| A. |
Check if mounting bolts (or nuts) are tightened properly. |
| A. |
Check if there is a gas leak. |
| A. |
Check if there is any damage, such as crack, on the parts. |
If a gas leak occur as a gasket was not installed or mounting
bolts (or nuts) were tightened inadequately, it may cause abnormal
engine noise.
If the cause of the problem is detected, retighten the
mounting bolts (or nuts) as the specified torque or replace the gasket
or damaged parts with new ones if necessary. |
| 2. |
Check for assembling of the exhaust manifold and the cylinder head.
| A. |
Check if a gasket is installed. |
| B. |
Check if the mounting bolts (or nuts) are tightened properly. |
| C. |
Check if there is a gas leak. |
If a gas leak occur as a gasket was not installed or mounting
bolts (or nuts) were tightened inadequately, it may cause abnormal
engine noise.
If the cause of the problem is detected, retighten the
mounting bolts (or nuts) as the specified torque or install a new gasket
if necessary. |
| 3. |
Check the turbocharger oil feed pipe & hose and oil drain pipe & hose.
| A. |
Check if a gasket is installed. |
| B. |
Check if the mounting bolts are tightened properly. |
| C. |
Check if the clamps are positioned in place. |
| D. |
Check if the oil pipes & hoses are damaged (bent, crushed, torn or cracked). |
If a gas leak occur as a gasket was not installed or mounting bolts were tightened inadequately, it may cause oil leaks.
If the oil feed pipe & hose is damaged, engine oil is not
supplied sufficiently to the turbocharger then it may damage the
turbocharger. If the oil drain pipe & hose is damaged and clogged,
engine oil is not drained smoothly then it may cause oil leaks from the
turbocharger.
If the cause of the problem is detected, retighten the
mounting bolts (or nuts) as the specified torque or replace the gasket
or damaged parts with new ones if necessary. |
| 4. |
Check for oil leaks between center housing and compressor housing.
| A. |
Check if the mounting bolts are tightened properly. |
| B. |
Check if there is an oil leak. |
If the O-ring (gasket) between the center housing and the compressor housing is damaged, it may cause oil leaks.
If an oil leak is detected, replace the turbocharger with a new one. |
| 5. |
Check the turbocharger actuator.
| A. |
Electronic actuator: Check for movement of the actuator rod
when a forced actuator operating mode is performed by GDS. (Refer to DTC
guide) 
|
If the turbocharger actuator is damaged, it may cause lack of engine power and poor acceleration.
If the actuator rod does not move, replace the turbocharger with a new one. |
| 6. |
Check the turbocharger compressor wheel.
| A. |
Check if the compressor wheel is damaged (bent or deformed). |
| B. |
Check if the compressor wheel rotates smoothly.
EX) 
|
If the compressor wheel are damaged, it may cause abnormal noise from the turbocharger and poor acceleration.
If the compressor wheel are damaged or deformed, replace the turbocharger with new ones. |
| 7. |
Check the turbocharger turbine wheel.
| A. |
Check if the turbine wheel is damaged. |
| B. |
Check if the turbine wheel rotates smoothly.
EX) 
|
If the turbine wheel are damaged, it may cause abnormal noise from the turbocharger and poor acceleration.
If the turbine wheel are damaged or deformed, replace the turbocharger with new ones. |
If any problem is not detected in the turbocharger, check the turbocharger-related parts according to the procedure as follows.
| 1. |
Check the blow-by hose.
| A. |
Check if the breather hose is damaged (bent, clogged). |
| B. |
Check if the positive crankcase ventilation (PCV) valve is clogged. |
If the breather hose is bent or clogged, the internal
pressure in the engine increases then engine oil is not supplied
smoothly to the turbocharger. So it may cause damage of the turbocharger
and oil leaks.
If the cause of the problem is detected, replace the breather hose or the related parts with new ones. |
| 2. |
Check the air intake hose connected to the turbocharger.
| A. |
Check if the air intake hose is damaged (bent, crushed, detached or torn). |
If a cross-section of the hose diminishes as the air intake
hose is bent or crushed, intake air to the turbocharger reduces and the
pressure in front of turbocharger drops. So it may cause damage of the
turbocharger and oil leaks. If the air intake hose is detached or torn, a
foreign substance goes into the turbocharger and causes damage of it.
If the air intake hose is damaged, replace it with a new one. |
| 3. |
Check the air cleaner.
| A. |
Check the air cleaner filter for pollution state. |
| B. |
Check the air cleaner filter for water influx. |
| C. |
Check the air cleaner cover for dirtiness. |
| D. |
Check if the air cleaner filter is a genuine part.. |
If the air cleaner filter is moistened or polluted
excessively or a non-genuine part is used, intake air to the
turbocharger reduces and the pressure in front of turbocharger drops. So
it may cause damage of the turbocharger and oil leaks. .
If the air cleaner filter is moistened or polluted excessively, replace it with a new one.
|
Replace the air cleaner filter according to the maintenance schedule. |
|
| 4. |
Check the intercooler hoses & pipes.
| A. |
Check if the intercooler hoses & pipes are connected properly. |
| B. |
Check if the intercooler hoses & pipes are damaged (bent, detached or torn). |
| C. |
Check if there is any damage, such as crack, on the intercooler pipes. |
| D. |
Check if the clamps are positioned in place. |
If the intercooler hoses & pipes are damaged or
disconnected, oil leaks may occur from the hoses & pipes and the
turbocharger may exceed the permissible speed then it may cause damage
of the turbocharger.
If the intercooler hoses & pipes are damaged, replace them with new ones.
|
Use new clamps when replacing the hoses & pipes. |
|
| 5. |
Check the intercooler.
| A. |
Check if the intercooler tubes and tanks are damaged (oil leak or crack). |
If the intercooler is damaged, the turbocharger may exceed the permissible speed then it may cause damage of the turbocharger.
If the intercooler is damaged, replace them with a new one.
|
Use new clamps when replacing the intercooler. |
|
| 6. |
Check the engine oil.
| A. |
Check the engine oil level. |
| B. |
Check the engine oil for discoloration, water influx and viscosity degradation. |
| C. |
Check the engine oil grade. |
If the engine oil level is low, amount of engine oil fed to
turbocharger reduces then the bearings in the turbocharger may adhere
due to insufficient lubrication and cooling.
If the cause of the problem is detected, add or change engine oil.
|
Change the engine oil according to the maintenance schedule. |
|
| 7. |
Check the engine oil pressure.
| A. |
Engine oil pressure: Check the oil pressure using an oil
pressure gauge after removing the oil pressure switch on the cylinder
block. |
| B. |
Check the engine oil screen in the oil pan if the engine oil
level is low. Then check the injectors for gas leaks if foreign
substances are accumulated on the oil screen. |
If the engine oil level is low, amount of engine oil fed to
turbocharger reduces then the bearings in the turbocharger may adhere
due to insufficient lubrication and cooling.
If the cause of the problem is detected, add or change engine
oil. If foreign substances are accumulated on the oil screen, wash the
oil screen and replace the injector’s washer with a new one after
checking the injectors for gas leaks. Check the engine oil-related
parts, such as oil pump, if necessary.
|
As the turbocharger rotates at high speed of 100,000 rpm or
above, deterioration of engine oil can cause damage of the turbocharger
bearings. Check engine oil for discoloration, water influx, viscosity
degradation and oil pressure lowering. |
|
| 8. |
Check the injectors, sensors, EGR valve, etc. (Refer to FL group)
| A. |
Check if the injectors operate properly. |
| B. |
Check if the sensors, such as the mass air flow sensor
(MAFS), intake air temperature sensor (IATS), boost pressure sensor
(BPS), operate properly. |
| C. |
Check if the exhaust gas recirculation (EGR) valve operates properly. |
If the injectors, sensors, EGR valve and etc. don’t work properly, it may cause lack of engine power.
If the cause of the problem is detected, replace the related parts with new ones. |
Components
1. Turbine housing2. Turbine inlet3. Turbine outlet4. Compressor housing5. Compressor inlet6. Compressor outlet7. Center housing8. Actuator9. Actuator rod
...
Components
1. Front muffler2. Center muffler3. Main muffler4. Gas ket5. Hanger
...
Turbo Charger Components and Components Location
Muffler Components and Components Location