Mazda Mazda6 Workshop Manual Supplement page 361

NO.16 HIGH OIL CONSUMPTION/LEAKAGE
16 HIGH OIL CONSUMPTION/LEAKAGE
• Oil consumption is excessive.
DESCRIPTION
• Improper engine oil level
• Improper dipstick
• Improper engine oil viscosity
POSSIBLE
• Engine internal parts malfunction
CAUSE
• Oil leakage
• Turbocharger malfunction
Diagnostic Procedure
STEP INSPECTION
1 Verify following:
• Proper dipstick
• Proper engine viscosity
• Engine oil level
Are all items okay?
2 Remove to necessary to inspect turbocharger.
Note
• Do not remove turbocharger.
Inspect if turbocharger compressor wheel is
bent, damaged, or interfering with housing on
vehicle.
Is there any problem?
3 Inspect if turbocharger compressor wheel
locknut is loose or has fallen down inside
turbocharger.
Is there any problem?
4 Turn turbocharger compressor wheel by hand.
Does wheel turn easily and smoothly?
5 Inspect if turbocharger turbine wheel is
damaged, cracked or interfering with housing on
vehicle.
Note
• Inspect all fins on each turbine wheel.
Is there any problem?
6 Is any engine oil found inside turbocharger
turbine housing?
7 Is any engine oil found inside turbocharger
compressor housing?
8 Is any engine oil found around oil pipes attached
on turbocharger center housing?
9 Is any engine oil found inside air intake pipes or
hoses?
10 Is engine compression correct?
(See B2–8 COMPRESSION
11 Verify test results.
• If okay, return to diagnostic index to service any additional symptoms.
• If malfunction remains, replace PCM. (See
TROUBLESHOOTING
RESULTS
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
INSPECTION)
No
F2–64 PCM
ACTION
Go to next step.
Service as necessary.
Repeat Step 1.
Replace turbocharger.
Go to next step.
Replace turbocharger.
Go to next step.
Go to next step.
Replace turbocharger.
Replace turbocharger.
Go to next step.
Excessive amount of oil is found:
Replace turbocharger.
Small amount of oil is found:
Wipe oil off of vehicle, then go to next step.
Go to next step.
Wipe oil off of vehicle, then go to next step.
Go to next step.
If oil leaks from damaged pipe, replace oil pipe.
Then, go to next step.
Go to next step.
Wipe engine oil off.
Turbocharger is okay.
Install all parts removed in Step 2.
Then go to next step.
Inspect oil leakage from outside of engine.
Inspect for following:
• Damaged valve seat
• Worn valve stem and valve guide
• Worn or stuck piston ring
• Worn piston, piston ring or cylinder
Service as necessary.
REMOVAL/INSTALLATION)
A6E408018881218
F2
F2–209