NO.10 HIGH ENGINE OIL CONSUMPTION [MZ-CD 1.6]

id0103e4854300

10

High engine oil consumption

DESCRIPTION

•  Engine oil consumption is excessive.

•  Engine oil in the intake-air system.

POSSIBLE CAUSE

•  Visibly damaged or worn parts

•  Loose or missing nuts or bolts

•  Use of the wrong type of engine oil.

•  Poor sealing at crankshaft front seal.

•  Poor sealing at Oil cooler

•  Faulty PCV system.

―  Hoses or ventilation or breather valves are blocked. This causes excessive pressure in the crankcase which causes more oil to enter the combustion chamber.

―  PCV oil separator is faulty and engine oil can enter the combustion chamber through the intake manifold.

•  Oil leakage from turbocharger

•  Damaged gaskets or mating surfaces.

―  Cylinder head gasket is damaged or mating faces are warped.

•  Valve stem seals.

―  Engine oil can enter the combustion chamber between the valve stem and the valve stem guide.

•  Damaged cylinder liners or excessive clearance of engine components.

―  Pistons

―  Piston rings (clearance in groove and end gap)

―  Cylinder liners

•  Blocked or damaged crankcase vent oil separator.

10	High engine oil consumption
DESCRIPTION	• Engine oil consumption is excessive. • Engine oil in the intake-air system.
POSSIBLE CAUSE	• Visibly damaged or worn parts • Loose or missing nuts or bolts • Use of the wrong type of engine oil. • Poor sealing at crankshaft front seal. • Poor sealing at Oil cooler • Faulty PCV system. ― Hoses or ventilation or breather valves are blocked. This causes excessive pressure in the crankcase which causes more oil to enter the combustion chamber. ― PCV oil separator is faulty and engine oil can enter the combustion chamber through the intake manifold. • Oil leakage from turbocharger • Damaged gaskets or mating surfaces. ― Cylinder head gasket is damaged or mating faces are warped. • Valve stem seals. ― Engine oil can enter the combustion chamber between the valve stem and the valve stem guide. • Damaged cylinder liners or excessive clearance of engine components. ― Pistons ― Piston rings (clearance in groove and end gap) ― Cylinder liners • Blocked or damaged crankcase vent oil separator.

Diagnostic procedure

STEP	INSPECTION	RESULTS	ACTION
1	VISUALLY INSPECT RELATED PART CONDITION • Visually inspect the following: Mechanical: ― Oil leaks ― Visibly damaged or worn parts ― Loose or missing nuts or bolts • Is there any malfunction?	Yes	Repair or replace the malfunctioning part according to the inspection results. Repeat Step 1.
1		No	Go to the next step.
2	INSPECT ENGINE OIL AND RELATED PARTS CONDITION • Inspect the following: ― Proper dipstick ― Incorrect engine oil viscosity • Is there any malfunction?	Yes	Repair or replace the malfunctioning part according to the inspection results.
2		No	Go to the next step.
3	INSPECT OIL COOLER SEALING • Visually inspect oil cooler for sealing. • Is there any oil leakage detected?	Yes	Replace the oil cooler o-ring. (See OIL COOLER REMOVAL/INSTALLATION [MZ-CD 1.6].)
3		No	Go to the next step.
4	INSPECT PCV VALVE • Inspect the PCV valve. (See FUEL INJECTOR INSPECTION [MZ-CD 1.6].) • Is the PCV valve normal?	Yes	Go to the next step.
4		No	Clean or replace the upper cylinder head cover. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [MZ-CD 1.6].)
5	VISUALLY INSPECT TURBOCHARGER TURBINE HOUSING FOR OIL LEAKAGE • Remove parts necessary to inspect the turbocharger without remove the turbocharger. • Is any engine oil found inside the turbocharger turbine housing?	Yes	If the excessive amount of oil is found: • Replace the turbocharger. (See EXHAUST SYSTEM REMOVAL/INSTALLATION [MZ-CD 1.6].) If the small amount of oil is found: • Wipe oil off of the vehicle, then go to the next step.
5		No	Go to the next step.
6	VISUALLY INSPECT TURBOCHARGER COMPRESSOR HOUSING FOR OIL LEAKAGE • Is any engine oil found inside the turbocharger compressor housing?	Yes	Wipe oil off of the vehicle. • Reinstall all removed parts in Step 5, then go to the next step.
6		No	Turbocharger is normal. • Reinstall all removed parts in Step 5, then go to the next step.
7	INSPECT FRONT SIDE OIL SEAL FOR OIL LEAKAGE • Visually inspect the front and camshaft oil seals. • Are there any oil leakage detected?	Yes	Replace the suspect oil seal. (See FRONT OIL SEAL REPLACEMENT [MZ-CD 1.6].) (See CAMSHAFT OIL SEAL REPLACEMENT [MZ-CD 1.6].)
7		No	Go to the next step.
8	INSPECT CYLINDER HEAD GASKET • Remove the cylinder head. (See CYLINDER HEAD GASKET REPLACEMENT [MZ-CD 1.6].) • Visually inspect cylinder head gasket and mating surface. • Is there any damaged or mating face wrapped?	Yes	Replace the cylinder head gasket, and/or clean the mating surface as necessary.
8		No	Go to the next step.
9	INSPECT REAR OIL SEAL FOR OIL LEAKAGE • Remove the manual transaxle. (See MANUAL TRANSAXLE REMOVAL/INSTALLATION [B65M-R].) • Visually inspect the rear oil seal. • Are there any oil leakage detected?	Yes	Replace the rear oil seal. (See REAR OIL SEAL REPLACEMENT [MZ-CD 1.6].)
9		No	Overhaul the engine and inspect followings: • Valve stem seals • Valve stem guide • Cylinder liners wear • Pistons • Piston rings (clearance in groove and end cap) Repair or replace as necessary.
10	Verify test results. • If normal, return to the diagnostic index to service any additional symptoms. (See SYMPTOM DIAGNOSTIC INDEX [MZ-CD 1.6].) • If the malfunction remains, inspect the related Service Information and perform the repair or diagnosis. ― If the vehicle is repaired, troubleshooting is completed. ― If the vehicle is not repaired or additional diagnostic information is not available, reprogram the PCM if a later calibration is available. Retest.