2003 NISSAN X-TRAIL low oil pressure

PRECAUTIONS
EM-5
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[QR20DE]PRECAUTIONSPFP:00001
Precautions for Drain CoolantEBS009QD
lDrain coolant when engine is cooled.
Precautions for Disconnecting Fuel PipingEBS009QE
lBefore starting work, make sure no fire or spark producing items are in the work area.
lRelease fuel pressure before disassembly.
lAfter disconnecting pipes, plug openings to stop fuel leakage.
Precautions for Removal and DisassemblyEBS009QF
lWhen instructed to use special service tools, use the specified tools. Always be careful to work safely,
avoid forceful or uninstructed operations.
lExercise maximum care to avoid damage to mating or sliding surfaces.
lCover openings of engine system with tape or the equivalent, if necessary, to seal out foreign materials.
lMark and arrange disassembly parts in an organized way for easy troubleshooting and re-assembly.
lWhen loosening nuts and bolts, as a basic rule, start with the one furthest outside, then the one diagonally
opposite, and so on. If the order of loosening is specified, do exactly as specified.
Precautions for Inspection, Repair and ReplacementEBS009QG
lBefore repairing or replacing, thoroughly inspect parts. Inspect new replacement parts in the same way,
and replace if necessary.
Precautions for Assembly and InstallationEBS009QH
lUse torque wrench to tighten bolts or nuts.
lWhen tightening nuts and bolts, as a basic rule, equally tighten in several different steps starting with the
ones in center, then ones on inside and outside diagonally in this order. If the order of tightening is speci-
fied, do exactly as specified.
lReplace with new gasket, packing, oil seal or O-ring.
lThoroughly wash, clean, and air-blow each part. Carefully check oil or coolant passages for any restriction
and blockage.
lAvoid damaging sliding or mating surfaces. Completely remove foreign materials such as cloth lint or dust.
Before assembly, oil sliding surfaces well.
lRelease air within route after draining coolant.
lAfter repairing, start engine and increase engine speed to check coolant, fuel, oil, and exhaust systems
for leakage.
Parts Requiring Angular TighteningEBS009QI
lUse an angle wrench for the final tightening of the following engine parts.
–Cylinder head bolts
–Lower cylinder block bolts
–Connecting rod cap bolts
–Crankshaft pulley bolt (No angle wrench is required as the bolt flange is provided with notches for angular
tightening)
lDo not use a torque value for final tightening.
lThe torque value for these parts are for a preliminary step.
lEnsure thread and seat surfaces are clean and coated with engine oil.

CAMSHAFT
EM-33
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CAMSHAFTPFP:13001
Removal and InstallationEBS009R0
CAUTION:
Apply new engine oil to parts marked in illustration before installation.
REMOVAL
lThe following procedure describes removing and installing camshaft without removing front cover. If the
front cover is removed or installed, removal of No.1 camshaft bracket is easier before step 8. Installation is
easier after step 3. Regarding removal and installation of front cover, refer toEM-43, "
TIMING CHAIN".
1. Release fuel pressure. Refer toEC-34, "
FUEL PRESSURE RELEASE",EC-399, "FUEL PRESSURE
RELEASE".
2. Remove parts listed below.
lIgnition Coil; Refer toEM-27, "Removal and Installation".
lRocker cover; Refer toEM-31, "Removal and Installation".
3. Remove power steering reservoir tank.
4. Remove Intake valve timing control cover.
KBIA0244E
1 Camshaft bracket 2 Washer 3 Front cover
4 Chain guide 5 Chain tensioner 6 O-ring
7 Spring 8 Chain tensioner plunger 9Intake valve timing control solenoid
valve
10 Intake valve timing control cover 11 Camshaft sprocket (EXH) 12 Camshaft sprocket (INT)
13 Valve lifter 14 Camshaft (EXH) 15 Camshaft (INT)
16 Camshaft position sensor (PHASE)

EM-52
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CYLINDER HEAD
CYLINDER HEAD
PFP:11041
On-Vehicle ServiceEBS009R3
CHECKING COMPRESSION PRESSURE
1. Warm up engine thoroughly. Then, stop it.
2. Release fuel pressure. Refer toEC-34, "
FUEL PRESSURE RELEASE"(WITH EURO-OBD),EC-399,
"FUEL PRESSURE RELEASE"(WITHOUT EURO-OBD).
3. Remove ignition coil and spark plug from each cylinder.
Refer to IGNITION COILEM-27, "
Removal and Installation"and SPARK PLUGEM-28, "Removal and
Installation".
4. Connect engine tachometer (not required in use of CONSULT-ll).
5. Disconnect fuel injector sub-harness to avoid fuel injection dur-
ing measurement.
6. Install compression tester with adapter onto spark plug hole.
lUse compression gauge whose picking up end inserted to spark
plug hole is smaller than 20 mm (0.79 in) in diameter. Otherwise,
it may be caught by cylinder head during removal.
7. With accelerator pedal fully depressed, turn ignition switch to
“START” for cranking. When the gauge pointer stabilizes, read
the compression pressure and engine rpm. Perform these steps
to check each cylinder.
Unit: mPa (bar, kg/cm2,psi)/rpm
CAUTION:
Always use a fully changed battery to obtain specified engine speed.
lIf the engine speed is out of specified range, check battery liquid for proper gravity. Check engine speed
again with normal battery gravity.
lIf compression pressure is below minimum value, check valve clearances and parts associated with com-
bustion chamber (Valve, valve seat, piston, piston ring, cylinder bore, cylinder head, cylinder head gas-
ket). After the checking, measure compression pressure again.
KBIA0269E
KBIA0130E
Standard MinimumDeference limit
between cylinders
1,19 (11.9,12.1, 173) /
2500,99 (9.9, 10.1, 144) /
2500.1 (1.0, 1.0, 14 ) / 250
SEM387C

CYLINDER HEAD
EM-53
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lIf some cylinders have low compression pressure, pour small amount of engine oil into the spark plug hole
of the cylinder to re-check it for compression.
–If the added engine oil improves the compression, the piston rings may be worn out or damaged. Check
the piston rings and replace if necessary.
–If the compression pressure remains at low level despite the addition of engine oil, the valves may be mal-
functioning. Check the valves for damage. Replace the valve or valve seat accordingly.
lIf two adjacent cylinders have respectively low compression pressure and their compression remains low
even after the addition of engine oil, the gaskets are leaking. In such a case, replace the cylinder head
gaskets.
8. Install spark plug, ignition coil and harness connectors.
Removal and InstallationEBS009R4
REMOVAL
1. Release fuel pressure. Refer toEC-34, "FUEL PRESSURE RELEASE"(WITH EURO-OBD),EC-399,
"FUEL PRESSURE RELEASE"(WITHOUT EURO-OBD).
2. Drain engine coolant and engine oil.
3. Remove the following components and related parts.
lEngine hood and engine under cover.
lAir cleaner case and air duct assembly; Refer toEM-15, "Removal and Installation".
lIgnition coils; Refer toEM-27, "Removal and Installation".
lRocker cover; Refer toEM-31, "Removal and Installation".
lEngine Coolant reservoir tank
lAuxiliary drive belt; Refer toEM-14, "Removal and Installation of Auxiliary Drive Belt Auto- tensioner".
lAlternator
lAuxiliary drive belt auto -tensioner; Refer toEM-14, "Removal and Installation of Auxiliary Drive Belt Auto-
tensioner".
lExhaust front tube; Refer toEX-2, "EXHAUST SYSTEM".
lExhaust manifold; Refer toEM-22, "Removal and Installation".
lIntake manifold collector, intake manifold and fuel tube assembly; Refer toEM-17, "Removal and Installa-
tion".
lWater control valve and housing; Refer toCO-21, "THERMOSTAT AND WATER CONTROL VALVE".
4. Remove front cover and timing chain. Refer toEM-43, "
Removal and Installation".
KBIA0250E
1 Cylinder head assembly 2 Cylinder head gasket 3 Cylinder head bolt

EM-64
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CYLINDER BLOCK
CYLINDER BLOCK
PFP:11010
Disassembly and AssemblyEBS009R8
KBIA0258E
1 Cylinder block 2 O-ring 3 Crankshaft position sensor (POS)
4 Knock sensor 5 Oil pressure switch 6 Lower cylinder block
7 Lower cylinder block bolt 8 Snap ring 9 Connecting rod
10 Connecting rod bearing 11 Connecting rod bearing cap 12 Connecting rod bolt
13 Piston 14 Oil ring 15 Second ring
16 Top ring 17 Piston pin 18 Thrust bearing
19 Main bearing upper 20 Crankshaft 21 Main bearing lower
22 Rear oil seal 23 Pilot convertor 24 Signal plate
25 Drive plate 26 Reinforce plate 27 Flywheel

EM-66
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CYLINDER BLOCK
lA commercial engine stand can be used.
NOTE:
lThis example is an engine stand for holding at transaxle
mounting side with the flywheel or drive plate removed.
3. Drain engine oil and coolant from inside of engine.
4. Remove the following components and associated parts.
lExhaust manifold and three way catalyst assembly; Refer to
EM-22, "
Removal and Installation".
lIntake manifold collector; Refer toEM-17, "Removal and
Installation".
lIntake manifold and fuel tube assembly; Refer toEM-17,
"Removal and Installation".
lIgnition coil; Refer toEM-27, "Removal and Installation".
lRocker cover; Refer toEM-31, "Removal and Installation".
lOil pan and oil strainer; Refer toEM-24, "Removal and Installation".
lFront cover, timing chain and balancer unit; Refer toEM-43, "Removal and Installation".
lCamshaft; Refer toEM-33, "Removal and Installation".
lCylinder head; Refer toEM-53, "Removal and Installation".
5. Remove knock sensor.
CAUTION:
Carefully handle the sensor avoiding shocks.
6. Remove crankshaft position sensor (POS).
CAUTION:
lAvoid impacts such as a dropping.
lDo not disassemble.
lKeep it away from metal particles.
lDo not place sensor close to magnetic materials.
7. Remove flywheel (M/T models) or drive plate (A/T models). Fix crankshaft with a stopper plate, and
remove mounting bolts.
Torx bit (size T55) : Flywheel (M/T models)
Torx socket (size E20): Drive plate (A/T models)
CAUTION:
lBe careful not to damage contact surface for the clutch
disc of the flywheel.
NOTE:
lThe flywheels, two block construction, allows movement in
response to transmission side pressure, or when twisted in its
rotational direction. Therefore, some amount of noise is nor-
mal.
PBIC0085E
KBIA0141E
KBIA0062E

SERVICE DATA AND SPECIFICATIONS (SDS)
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Balancer unit timing chain tensioner 6.4 - 7.5 (0.65 - 0.76, 57 - 66) *2
*1 Balancer unit 1) 45.2 - 51.0 (4.6 - 5.2, 34 - 37)
2) 90°-95°(Angle tightening)
3) 0 ,(0.0 ,0)
4) 45.2 - 51.0 (4.6 - 5.2 ,34 - 37 )
5) 90°-95°(Angle tightening)
*1 Cylinder head 1) 98.1 (10.0, 72)
2) 0 (0.0, 0)
3) 34.3 - 44.1 (3.5 - 4.5, 26 - 32)
4) 75°-80°(Angle tightening)
5) 75°-80°(Angle tightening)
Flywheel (M/T)103 - 113 (10.5 - 11.5, 76 - 83)
Drive plate (A/T)103 - 113 (10.5 - 11.5 ,76 - 83)
Connecting rod bearing cap 1) 18.6 - 20.6 (1.9 - 2.1, 14 - 15)
2) 90°-95°(Angle tightening)
*1 Lower cylinder block M10 bolt 1) 36.3 - 42.2 (3.7 - 4.3, 27 - 31)
M10 bolt 2) 60°-65°(Angle tightening)
M8 bolt 3) 19.6 - 24.5 (2.0 - 2.5 , 15 - 18)
Knock sensor15.7 - 26.5 (1.6 - 2.7, 12 - 19)
Oil pressure switch12.3 - 17.2 (1.25 -1.75 , 9 - 12)
Signal plate1) 12-14(1.2-1.4,9-10)
Crankshaft position sensor (POS) 5.4 - 7.3,(0.55 - 0.75 , 48 - 64) *2

EM-102
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PRECAUTIONS
[YD22DDTi]PRECAUTIONSPFP:00001
Precautions for Drain CoolantEBS00BNO
lDrain coolant when engine is cooled.
Precautions for Disconnecting Fuel PipingEBS00BNP
lBefore starting work, make sure no fire or spark producing items are in the work area.
lRelease fuel pressure before disassembly.
lAfter disconnecting pipes, plug openings to stop fuel leakage.
Precautions for Removal and DisassemblyEBS00BNQ
lWhen instructed to use special service tools, use the specified tools. Always be careful to work safely,
avoid forceful or uninstructed operations.
lExercise maximum care to avoid damage to mating or sliding surfaces.
lCover openings of engine system with tape or the equivalent, if necessary, to seal out foreign materials.
lMark and arrange disassembly parts in an organized way for easy troubleshooting and re-assembly.
lWhen loosening nuts and bolts, as a basic rule, start with the one furthest outside, then the one diagonally
opposite, and so on. If the order of loosening is specified, do exactly as specified.
Precautions for Inspection, Repair and ReplacementEBS00BNR
lBefore repairing or replacing, thoroughly inspect parts. Inspect new replacement parts in the same way,
and replace if necessary.
Precautions for Assembly and InstallationEBS00BNS
lUse torque wrench to tighten bolts or nuts.
lWhen tightening nuts and bolts, as a basic rule, equally tighten in several different steps starting with the
ones in center, then ones on inside and outside diagonally in this order. If the order of tightening is speci-
fied, do exactly as specified.
lReplace with new gasket, packing, oil seal or O-ring.
lThoroughly wash, clean, and air-blow each part. Carefully check oil or coolant passages for any restriction
and blockage.
lAvoid damaging sliding or mating surfaces. Completely remove foreign materials such as cloth lint or dust.
Before assembly, oil sliding surfaces well.
lRelease air within route after draining coolant.
lAfter repairing, start engine and increase engine speed to check coolant, fuel, oil, and exhaust systems
for leakage.
Parts Requiring Angular TighteningEBS00BNT
lUse an angle wrench for the final tightening of the following engine parts:
–Cylinder head bolts
–Main bearing cap bolts
–Connecting rod cap nuts
–Crankshaft pulley bolt (No angle wrench is required as the bolt flange is provided with notches for angular
tightening)
lDo not use a torque value for final tightening.
lThe torque value for these parts are for a preliminary step.
lEnsure thread and seat surfaces are clean and coated with engine oil.