 |
 |
Troubleshooting |
 |
|
|
 |
|
| An oil leak and white smoke do not stop |
 |
|
| 1. |
The oil which leaked remains in the muffler
| Possible causes and remedies |
It operates until oil is burned out
|
|
| 2. |
No problem at wheel spin, Clearance of the shaft is reasonable
| Possible causes and remedies |
There is little possibility of the fault of a turbo.
|
|
| 3. |
Excessive piston blowby or high internal crankcase pressure cause turbocharger oil leakage from Compressor and turbine seal.
The simple check method
(1) If the lubrication cap of oil, a level gauge, and a blowbye hose are removed, white smoke will disappear.
(2) At the time of idol operation, where a lubrication mouth is removed, the open air is not inhaled from a lubrication mouth.
(It turns out that smoke is brought close to an oil supply mouth)
| Possible causes and remedies |
(1) Or when there is condition of (2), there is the possibility that piston blowbye is high. If engine is normal condition, since engine is made to inhale a piston blowbye compulsorily using minus pressure of intake mani, a crank case is always in a minus pressure state, It is to also maintains minus pressure in turbo, and oil does not blow off from a turbo.
|
|
|
|
|
|
 |
 |
Excessive high internal crankcase pressure cause turbocharger oil leakage from Compressor and turbine seal |
|
 |
|
|
| If a crank case is not always minus pressure, oil will leak from a turbo. |
|
|
Inside of a crank case A pressure is a grade about shown below although it changes with types of a car.
| Idling |
：-5～-70mmH2O |
| 2,000～2,500rpm |
：-100～-400mmH2O |
|
The cause considered
(1) Wear of a piston ring, a cylinder, and a valve guide
Since combustion gas leaks excessively, a piston blowbye cannot be inhaled.
Be careful of the car with much mileage.
(2) Blowbye hose and PCV valve are got blocked.
A partially closed PCV allows manifold boost to pressurize the crankcase related oil leakage.
High crankcase pressure and excessive piston blowby can be ventilated by PCV flow control valves.
PCV valves on spark ignition engines must operate as one way check valves when boost is developed.
This reverses the direction of flow in the ventilation system.
A partially closed PCV allows manifold boost to pressurize the crankcase.
|
|
|
|
|
|
|
