The largest percentage of failed turbochargers are caused by lubrication problems. Turbocharger problems experienced in the field can often be corrected by system troubleshooting.
Check the following item again, and please confirm it.
1.Engine lacks power or lacks boost
The turbocharger is normal, if compressor or turbine wheel no rub, no bent , and no problem at wheel spin by finger-tip. The next cause is thought about without pressurizing it in such a state when the output is lacking in it.
(1)Poor in the pressure adjustment of the actuator and poor in the operation.(Even if boost pressure rises too high as for the turbo, it raise a fuel cut and become acceleration defectiveness.)
(2)Exhaust bypass valve (a swing valve) adheres to it, and exhaust gas leaks, and boost is not raise.
2.Oil leak / White smoke
An oil leak and white smoke do not stop after turbo replaced .
(1)The oil which leaked remains in the muffler however turbocharger replaced. It operates until oil is burned out.
(2)Excessive high internal crankcase pressure cause turbocharger oil leakage from Compressor and turbine seal.
As for the turbocharger, oil does not leak the center housing inside outside by keeping minus number pressure. This is the following condition, and center housing inside becomes plus pressure and wakes up an oil leak even if a turbo is normal. Because excessive blowbye (Since combustion gas leaks excessively) and blow by are not discharged appropriately, this happens.
(3)Oil breathe into turbo inlet hose from blowbye hose by plugged air-cleaner.
3.Noise / symphonic noise / Clarinetist noise
The turbocharger gives a loud sound of frequency peculiar to turbo individually. It is necessary to recognize a sound by the abnormality of the turbo. As for the (allophone) there is abnormality, and to utter, next is thought about.
4.Turbocharger rotating section binding or
dragging
The turbo is with bearing material contact and binding up of rotor, but wakes up the binding of rotor by the following cause as well as it.
5.No problem at wheel spin by finger-tip,clearance of the shaft is correct play but oil leak
Misty Compressor-in
Oily Turbine-out
A many case of Oil leakage are caused by lubrication probrems. Always inspect and assess turbocharger condition before removal from the engine.
Check the Plugged or Dirty air cleaner element
Before turbo install, inject engine oil from turbo oil inlet, rotate a wheel with a finger, and oil should spread round a bearing part.
Don't raise engine rotation rapidly after engine starting and hold the idling state for 10 minutes. Actually run after engine warmth and check the operation situation of a turbocharger.
The turbocharger has a relapse of a trouble only by having changed a turbo depending on the cause of the trouble.
The largest percentage of failed turbochargers are caused by lubrication problems. Turbocharger problems experienced in the field can often be corrected by system troubleshooting.
Always inspect and assess turbocharger condition before removal from the engine. Check the following item and confirm it.
A1.Broken Turbine Wheel shaft, locking wheel
Possibility of Insufficient Luburication :Check oil lubrication line, replace oil feed pipe.
It is a characteristic that the insufficient luburication / running out of temporary oil film, turbine shaft which rortate super-high-turbine speed will be in a high temperature as for the turning shaft and purple (a temper color) that firing entered stays to bearing and the branded shaft.
Because it is very likely that a ceramic piece remains between turbo and catalyst, confirm it elaborately
Change engine oil. Engine oil should surely use the grade specified by a maker.
Don't raise engine rotation rapidly after engine starting and hold the idling state for 10 minutes. Actually run after engine warmth and check the operation situation of a turbocharger.
A2.Insufficient luburication / running out of temporary oil film
Temper color
It is a characteristic that the insufficient luburication / running out of temporary oil film, turbine shaft which rortate super-high-turbine speed will be in a high temperature as for the turning shaft and purple (a temper color) that firing entered stays to bearing and the branded shaft.
Carbon slugged in union bolt
Cause of bearing metal contact
(1)Carbon slugged in union bolt or clogged oil feed pipe (Carbon slugged by heat soak back of the exhaust manifold)
(2)Raise engine rotation rapidly after engine starting without enough oil luburication to bearing section
(3)Lack of quantity of engine oil supply
(4)Oil pressure fall by poor oil pump
Clogged oil feed pipe |
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Sludge which is left in mesh part in a union bolt,Foreign material such as the metal powder. |
Clogged up of oil strainer
In the case of the car which past oil management is not good, and a car career is old, and run a long range: It causes blocking to an oil strainer and insufficient lubrication oil to the turbo even if it changes an engine oil oil filter oil pipe union bolt without oil of enough quantity being drawn in an oil pump and is in danger of a turbo being damaged.
Normal state
Sludge which is left in mesh part in a union bolt
B1.Dirty oil / Foreign objet in lubricating oil
Bearing worn and shaft scratched by contaminated oil or foreign object in oil
Shaft scratched by foreign object in oil
Bearing worn by foreign object oil or
Slugged oil on oil inlet
Causes of foreign object in oil
(1)Residual sludge of oil pipe flows into the turbo when replace turbochager.
(2)Foreign object in center housing when Oil exchange
(3)Posshibility of foeign object from engine such as Vlave by engine malfunction
(4)The damage of the oil filter, deterioration, it is clogged up
(5)Poor operation of oil filter
(6)Contaminated oil
Scratched on bearing bore and shaft circumference
B2.Slugged oil on oil inlet
The case is changed oil feed pipe and clean completely an attachment eye bolt and a block oil hole.
The ball bearing type turbocharger is used for some types of a car (refer to list) of Daihatsu Motor and Honda.
The case is changed oil feed pipe and clean completely an attachment eye bolt and a block oil hole.
The ball bearing type turbocharger is used for some types of a car (refer to list) of Daihatsu Motor and Honda.
Garbage, sludge, etc. are plugged in the extracted portion to which the engine side oil passage of a turbo oil feed pipe is thinly extracted like the appending photograph by this (0.75mm), and the Shaft discoloration from insufficient lubrication.
| Type of Car | Vehicle | Vehicle model | Turbo part No |
|---|---|---|---|
| Daihatsu | Mira | L502S,L512S |
VQ27,VQ29 |
| Move | L602S | VQ27,VQ29 | |
| L902S | VQ37 | ||
| Opti | L802S | VQ37 | |
| Honda | Z | GF-PA1 | VG05 |
| Vamos | HM1,HM2 | VG06 | |
| Life(Dunk) | JB4 | VG07 |
C1.Foreign object damage on compressor wheel
Foreign object or material in compressor intet ducting,check intake system.
In case the foreign object damage in turbine or compressor wheel,rotor reaches by imbalance in a shaft occasion with bearing metal contacts when it continues running.
Jammed oil drain pipe of the turbo, an inlet pipe, the carbon of the union bolt and am stained and am destroyed, and the confirmation oil pipe of the alien substance does a pipe and a union bolt to a set at the attachment, and change it by all means.
Check of Air cleaner, Objects( Bolt, Nut, Cloth ) in Intake pipe and Exhaust pipe.
Use a new gasket for a turbo oil inlet / outlet part, and do not use liquid gasket.
Since sludge may flow into a turbo, do not perform engine Flushing after turbo exchange, and cleaning.
C2.None Lock-nut of Compressor Wheel
The case which is up with A, do lubrication system check in particular.
Remove the Lock-nut from inside of air cleaner or intake pipe. ( In case the turbocharger was failed by same cause, warranty claim is not accepted )
Foreign object damage to impeller. Please confirm whether a impeller lock nut sticks by all means. When there is not it, It is left in an air cleaner or the intake pipe and turbo failure again. It does not become the object of the claim.
Foreign object damage on compressor wheel
Causes of foreign object in compressor ducting
(1)Impeller lock nut is left in an air cleaner or intake pipe and foreign into compressor wheel again
(2)Having left an alien substance at the time of turbo installation（Washer, Wes）
D.Turbine wheel damage due to a hard object
Foreign object damage on turbine
wheel
Alien substance remains
Posshibility of foeign object from engine such as Vlave etc.
In case the foreign object damage in turbine or compressor wheel,rotor reaches by imbalance in a shaft occasion with bearing metal contacts when it continues running.
Check of PCV valve movement
Be careful enough for garbage not to go into the oil entrance of a turbo, a pipe, and a union bolt.
Because it is very likely that a ceramic piece remains between turbo and catalyst, confirm it elaborately
Causes of foreign object in exhaust ducting
(1)foeign object from engine such as Wear of a piston ring, a cylinder, and a valve guide by engine malfunction
(2)Foeign object from exhaust manifold such as oxidation object
Caution:
Remove the Lock-nut from inside of air cleaner or intake pipe. ( In case the turbocharger was failed by same cause, warranty claim is not accepted )
E.Excessive piston blowby or high internal crankcase pressure cause turbocharger oil leakage from Compressor and turbine seal.
It operates until oil is burned out
There is little possibility of the fault of a turbo.
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)
(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.
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 plugged.
A partially closed PCV allows manifold boost to pressurize the crankcase related oil leakage.
Head cover
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Head cover backside
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Air does not fall out to the upper part even if it carries away air from PCV bottom
· Clean with brakes cleaner |
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There is the case that the hose installation connector backside blocks up with sludge
· Confirm the penetration with wire · If is a confined situation, there is connecting with wire; and the alien substance removal, air blow |
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There is the case that the hole which you should penetrate like a photograph blocks up with sludge
· Confirm the penetration with wire · If is a confined situation, there is connecting with wire; and the alien substance removal, air blow |
F.Bent wheel
Compressor wheel damage due to a soft object is bent toward oposit of rotation.
G.Be sooted visual appearance
Possibility of exhaust gas leakage, replace gaskets and tighten bolt. This will be a cause of noisy turbo or engine lacks power.
Each connecting part, hose, check of clamps
