 INSPECTION PROCEDURE
 Trouble Diagnosis of Turbocharger
Check items before trouble diagnosis 1.Check that the engine oil level is between L (Low level) and H (High level) of the oil level gauge. [When the engine oil amount is more then H (High level), the engine oil flows into the inlet duct through the blow‐by gas passage, and the turbocharger is misjudged failure.] Refer to Inspection. 2.Ask the customer if he/she always runs the vehicle in idle engine speed to cool the engine oil down after driving.- Replace the exhaust manifold and turbocharger assembly when any malfunction is found after unit inspections specified in the table below.
- If no malfunction is found after the unit inspections, judge that the turbocharger body has no non‐standard conditions. Check the other parts again.
Inspection Location
| Result
| Symptoms likely to occur when the results shown on the left exist.
| Oil leakage
| Smoke
| Noise
| Poor power Poor acceleration
| Turbine wheel
| Wet with oil.
| C
| A
| C
| C
| Carbon deposits observed.
| C
| A
| B
| B
| “Rubs against” housing.
| C
| B
| A
| B
| Vane is bent or broken.
|
|
| A
| A
| Compressor wheel
| Inside of intake port is badly stained with oil.
| B
| B
|
|
| “Rubs against” housing.
| C
| B
| A
| B
| Vane is bent or broken.
|
|
| A
| A
| Check both turbine and compressor rotor shaft end play.
| Heavy feel or catching when turned by hand.
|
| C
| C
| B
| Cannot be turned by hand.
|
|
|
| A
| Excessively loose bearing.
| C
| C
| B
| C
| Rotor shaft, oil return port (Check inside using penlight.)
| Carbon or sludge deposits in oil drain port.
| C
| A
| C
| C
| Boost control valve actuator operation (using a handy pump)
| - Does not operate smoothly when air pressure is gradually applied.
- Stroke amount is not compliance with the air pressure.
|
|
|
| A
|
A:
| Highly possible.
| B:
| Possible.
| C:
| May exist.
|
 INSPECTION AFTER DISASSEMBLY
 INSPECTION AFTER ASSEMBLY
Start engine, and raise engine speed to check that there are exhaust gas and no oil leakage.
|