Mazda Speed 6. Manual - part 6

 

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Mazda Speed 6. Manual - part 6

 

 

01 ENGINE

26

 Turbocharger Diagnosis

Black Smoke

Dirty air fi lter system 
Suction and pressure line distorted or leaking 
Excessive fl ow resistance in exhaust system/leakage 
upstream of turbine 
 Fuel system/injection feed system defective or incorrectly 
adjusted 
Valve guide, piston rings, engine or cylinder liners worn/
increased blow by 
Dirty compressor or charge air cooler 
Boost pressure control swing valve/poppet valve does not 
close 
Turbocharger bearing damage 
Foreign body damage on compressor or turbine 
Engine air collector cracked/missing or loose gaskets 
Turbine housing/fl ap damaged 
 Insuffi cient oil supply of turbocharger 

Lack of Power/Boost Pressure Low

Dirty air fi lter system 
Suction and pressure line distorted or leaking 
Excessive fl ow resistance in exhaust system/ leakage 
upstream of turbine 
Fuel system/injection feed system defective or incorrectly 
adjusted 
Valve guide, piston rings, engine or cylinder liners worn/
increased blow by 
Dirty compressor or charge air cooler 
Boost pressure control swing valve/poppet valve does not 
close 
Pipe assy. to swing valve/poppet valve defective 
Turbocharger bearing damage 
Foreign body damage on compressor or turbine 
Engine air collector cracked/missing or loose gaskets 
Turbine housing/fl ap damaged 
Insuffi cient oil supply of turbocharger

Boost Pressure Too High

Fuel system/injection feed system defective or incorrectly 
adjusted 
Boost pressure control swing valve/poppet valve does not 
open 
Pipe assy. to swing valve/poppet valve defective 

Compressor/Turbine Wheel Failure

Turbocharger bearing damage 
Foreign body damage on compressor or turbine 
Turbine housing/fl ap damaged 
Insuffi cient oil supply of turbocharger

High Oil Consumption

Dirty air fi lter system 
Excessive fl ow resistance in exhaust system/ leakage 
upstream of turbine 
Oil feed and drain lines clogged, leaking or distorted 
Crankcase ventilation clogged and distorted 
Coke and sludge in turbocharger center housing 
Valve guide, piston rings, engine or cylinder liners worn/
increased blow by 
Dirty compressor or charge air cooler 
Piston ring sealing defective 
Turbocharger bearing damage

Blue Smoke

Dirty air fi lter system 
Excessive fl ow resistance in exhaust system/ leakage 
upstream of turbine 
Oil feed and drain lines clogged, leaking or distorted 
Crankcase ventilation clogged and distorted 
Coke and sludge in turbocharger center housing 
Valve guide, piston rings, engine or cylinder liners worn/
increased blow by 
Dirty compressor or charge air cooler 
Piston ring sealing defective 
Turbocharger bearing damage

Black and Blue Smoke

Dirty air fi lter system 
Excessive fl ow resistance in exhaust system/ leakage 
upstream of turbine 
Valve guide, piston rings, engine or cylinder liners worn/
increased blow by 
Dirty compressor or charge air cooler 
Turbocharger bearing damage 

Oil Leakage at Turbine

Oil feed and drain lines clogged, leaking or distorted 
Crankcase ventilation clogged and distorted 
Coke and sludge in turbocharger center housing 
Valve guide, piston rings, engine or cylinder liners worn/
increased blow by 
Piston ring sealing defective 
Turbocharger bearing damage

Turbocharger noise

Suction and pressure line distorted or leaking 
Excessive fl ow resistance in exhaust system/ leakage 
upstream of turbine 
Dirty compressor or charge air cooler 
Turbocharger bearing damage 
Foreign body damage on compressor or turbine 
Exhaust gas leakage between turbine outlet and exhaust 
pipe 
Engine air collector cracked/missing or loose gaskets 
Turbine housing/fl ap damaged 
Insuffi cient oil supply of turbocharger 

Oil Leakage at Compressor

Dirty air fi lter system 
Excessive fl ow resistance in exhaust system/ leakage 
upstream of turbine 
Oil feed and drain lines clogged, leaking or distorted 
Crankcase ventilation clogged and distorted 
Coke and sludge in turbocharger center housing 
Valve guide, piston rings, engine or cylinder liners worn/
increased blow by 
Dirty compressor or charge air cooler 
Piston ring sealing defective 
Turbocharger bearing damage

01 ENGINE

27

Black 
Blue Smoke
Compressor/Turbine Wheel Failure

Turbocharger bearing damage

Black 
Blue Smoke
High Oil Consumption
Compressor/Turbine Wheel Failure

Turbocharger bearing damage

Black 
Blue Smoke
High Oil Consumption

Dirty air fi lter system 
Excessive fl ow resistance in exhaust system/ leakage 
upstream of turbine 
Valve guide, piston rings, engine or cylinder liners worn/
increased blow by 
Dirty compressor or charge air cooler 
Turbocharger bearing damage

Black 
Blue Smoke
Insuffi cient power

Dirty air fi lter system 
Excessive fl ow resistance in exhaust system/ leakage 
upstream of turbine 
Valve guide, piston rings, engine or cylinder liners worn/
increased blow by 
Dirty compressor or charge air cooler 
Turbocharger bearing damage 

Black 
Blue Smoke
Oil Leak at Compressor

Dirty air fi lter system 
Excessive fl ow resistance in exhaust system/ leakage 
upstream of turbine 
Valve guide, piston rings, engine or cylinder liners worn/
increased blow by 
Dirty compressor or charge air cooler 
Turbocharger bearing damage 

Black 
Blue Smoke
Oil Leak at Turbine

Valve guide, piston rings, engine or cylinder liners worn/
increased blow by 
Turbocharger bearing damage 

Black 
Blue Smoke
Noisy Turbocharger

Excessive fl ow resistance in exhaust system/ leakage 
upstream of turbine 
Dirty compressor or charge air cooler 
Turbocharger bearing damage 

Black 
Blue Smoke
High Oil Consumption
Compressor/Turbine Wheel Failure
Insuffi cient Power

Turbocharger bearing damage

Black 
Blue Smoke
High Oil Consumption
Compressor/Turbine Wheel Failure
Insuffi cient Power
Oil Leak at Compressor

Turbocharger bearing damage

Black 
Blue Smoke
High Oil Consumption
Compressor/Turbine Wheel Failure
Insuffi cient Power
Oil Leak at Compressor
Oil Leak at Turbine

Turbocharger bearing damage

Black 
Blue Smoke
High Oil Consumption
Compressor/Turbine Wheel Failure
Insuffi cient Power
Oil Leak at Compressor
Oil Leak at Turbine
Turbocharger generates noise

Turbocharger bearing damage

01 ENGINE

28

Turbocharger Diagnosis by Symptom 

Possible Cause

Symptoms

Black smoke

Blue smoke

High Boost Pressure

Compressor/ turbine 

wheel damage

High oil consumption

Low  power/low boost 

pressure

Oil leak into 

compressor

Oil leak into turbine

T

u

rbocharger noisy

Dirty air fi lter 

 







Inlet duct distorted or leaking 

 







Outlet duct distorted or leaking





Overfi lled crankcase





PCV plugged or lines distorted 









Turbo oil inlet line plugged or 
distorted 





Turbo oil inlet line leaking 



Turbo oil drain line plugged or 
distorted









Turbo oil drain line leaking 



Low engine compression: valve 
guides, piston rings, cylinders worn/
increased blow by

 









Excessive fl ow resistance/
backpressure in exhaust system or 
leakage upstream of turbine 









Fuel system problem







Dirty compressor or charge air cooler 











Waste gate control valve does not 
close







Turbocharger bearing damage

 













 Foreign body damage to 
compressor or turbine 







Engine air collector cracked or loose 
gaskets







Turbine housing/fl ap damaged









Insuffi cient oil supply to turbocharger









Coke and sludge in turbocharger 
center housing 









Waste gate control valve defective





Exhaust gas leakage between 
turbine outlet and exhaust pipe 



01 ENGINE

29

Lubrication Routing Diagram

Coolant Routing Diagram

The coolant lines run from the cylinder head to the EGR valve and turbocharger.

 

 

 

 

 

 

 

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