2003 NISSAN X-TRAIL check engine

EM-42
[QR20DE]
CAMSHAFT
3. Measure the center thickness of the removed valve lifters with a
micrometer.
4. Use the equation below to calculate valve lifter thickness for replacement.
lValve lifter thickness calculation.
Thickness of replacement valve lifter = t1+ ( C1 — C2 )
t1 = Thickness of removed valve lifter.
C1 = Measured valve clearance.
C2=Standard valve clearance.
lThickness of a new valve lifter can be identified by stamp
marks on the reverse side (inside the cylinder).
Stamp mark 696 indicates 6.96mm (0.2740in) in thickness.
Available thickness of valve lifter: 26 sizes with range 6.96 to 7.46 mm (0.2740 to 0.2937 in) in steps of
0.02 mm (0.0008 in) (when manufactured at factory).
5. Install the selected valve lifter.
6. Install camshaft.
7. Manually turn crankshaft pulley a few turns.
8. Check that valve clearances for cold engine are within specifications by referring to the specified values.
9. After completing the repair, check valve clearances again with the specifications for warmed engine. Make
sure the values are within specifications.
Valve clearance:
Unit: mm (in)
*: Approximately 20°C(68°F)
KBIA0057E
Intake : 0.36 mm (0.0142 in)
Exhaust : 0.37 mm (0.0146 in)
KBIA0119E
Cold* (reference data) Hot
Intake 0.24 - 0.32 (0.009 - 0.013) 0.32 - 0.40 (0.013 - 0.016)
Exhaust 0.26 - 0.34( 0.010 - 0.013) 0.33 - 0.41 (0.013 - 0.016)

EM-48
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TIMING CHAIN
INSTALLATION
NOTE:
lThe figure shows the relationship between the mating mark on
each timing chain and that on the corresponding sprocket, with
the components installed.
lBecause of parallel manufacture, there are two types of mark
(link colors) for timing chain.
1. Make suer that crankshaft key points straight up.
2. Tighten mounting bolt in the numerical order shown in the figure
with the following procedure, and install balancer unit.
CAUTION:
lWhen reusing a mounting bolt, check its outer diameter
before installation, Refer toEM-47, "
INSPECTION AFTER
REMOVAL".
a. Apply new engine oil to threads and seat surfaces of mounting
bolts.
b. Tighten them to 45.2 to 51.0 N·m (4.6 to 5.2kg-m, 34 to 37 ft-lb).
c. Turn them another 90 to 95°(Target: 90°).
d. Fully loosen to 0 N·m (0 kg-m, 0 ft-lb).
lLoosen in the reverse order of tightening.
e. Tighten them to 45.2 to 51.0 N·m (4.6 to 5.2 kg-m, 34 to 37 ft-lb).
f. Turn them another 90 to 95°(Target: 90°).
CAUTION:
lCheck tightening angle with an angle wrench or a pro-
tractor. Do not make judgment by visual check alone.
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KBIA0122E
KBIA0080E

TIMING CHAIN
EM-51
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9. Install Intake valve timing control cover with the following procedure.
a. Install Intake valve timing control solenoid valves to Intake valve timing control cover.
b. Install Oil rings to the intake camshaft sprocket insertion points on Intake valve timing control backside
cover.
c. Install O-ring to front cover.
d. Apply liquid gasket to the positions in the figure.
e. Tighten mounting bolts in the numerical order shown in the fig-
ure.
10. Insert crankshaft pulley by aligning with crankshaft key.
lTap its center with a plastic hammer to insert.
lDo not tap belt hook.
11. Tighten crankshaft pulley mounting bolts.
lSecure crankshaft pulley with a pulley holder, and tighten the bolts.
lPerform angle tightening with the following procedure.
a. Apply new engine oil to threads and seat surfaces of mounting bolts.
b. Tighten to 37.3 to 47.1 N·m (3.8 to 4.8 kg-m, 28 to 34 ft-lb).
c. put a paint mark on front cover, mating with any one of six easy
to recognize stamp marks on bolt flange.
d. Turn another 60°to 66°[Target: 60°].
lCheck vertical mounting angle with movement of one stamp
mark.
12. Install remaining parts in reverse order of removal.
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PBIC0258E

EM-52
[QR20DE]
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-54
[QR20DE]
CYLINDER HEAD
5. Remove camshaft. Refer toEM-33, "Removal and Installation".
6. Securely support bottom of cylinder block with a jack or equivalent tool, and remove the hoist that was
supporting it.
7. Remove cylinder head loosening bolts in reverse order shown in
the figure.
INSPECTION AFTER REMOVAL
OuterDiameterofCylinderHeadBolts
lCylinder head bolts are tightened by plastic zone tightening
method. Whenever the size difference between d1 and d2
exceeds the limit, replace them with new one.
lIf reduction of outer diameter appears in a position other than
d2, use it as d2 point.
INSTALLATION
1. Install cylinder head gasket.
2. Follow the steps below to tighten fixing bolts in the order shown
in figure to install cylinder head.
CAUTION:
lIf cylinder head bolts are re-used, check their outer diam-
eters before installation. Refer toEM-54, "
Outer Diameter
of Cylinder Head Bolts".
lIn step “c”, loosen bolts in the reverse order of that indi-
catedinfigure.
a. Apply new engine oil to threads and seating surface of mounting
bolts.
b. Tighten all bolts to 98.1 N·m (10 kg-m, 72 ft-lb).
c. Completely loosen to 0 N·m (0 kg-m, 0 ft-lb).
d. Tighten all bolts to 34.3 to 44.1 N·m (3.5 to 4.4 kg-m, 26 to 32 ft-lb).
e. Turn all bolts 75°to 80°(target: 75°) degrees clockwise.
f. Turn all bolts 75°to 80°(target: 75°) degrees clockwise again.
CAUTION:
Check and confirm the tightening angle by using angle
wrench or protractor. Avoid judgment by visual inspection
without the tool.
KBIA0058E
Limit (d1 - d2) : More than 0.23 mm (0.0091 in)
KBIA0189E
KBIA0058E
KBIA0059E

ENGINE ASSEMBLY
EM-63
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lUse a manual lift table caddy or equivalently rigid tool such as a
jack or trestle. Securely support bottom of engine and transaxle,
and simultaneously adjust hoist tension.
CAUTION:
lPut a piece of wood or something similar as the support-
ing surface, secure a completely stable condition.
23. Remove RH engine mounting insulator.
24. Pull LH engine mounting through-bolt out.
25. Remove mounting bolts at front end of center member.
26. Remove front suspension member mounting bolts and nuts.
27. Remove engine, transaxle and transfer assembly with suspen-
sion member from vehicle downward by carefully operating sup-
porting tools.
CAUTION:
lDuring the operation, make sure that no part interferes
with body side.
lBefore and during this lifting, always check if any har-
nesses are left connected.
lDuring the removal operation, always be careful to pre-
vent vehicle from falling off the lift due to changes in the center of gravity.
lIf necessary, support vehicle by setting a jack or equivalent tool at the rear.
28. Remove power steering pump with piping connected from engine. Move it aside on suspension member.
29. Remove front engine mounting and rear engine mounting through-bolts to remove suspension member.
30. Remove starter motor.
31. Separate engine and transaxle.
INSTALLATION
Install in the reverse order of removal.
lDo not allow oil to get on mounting insulator. Be careful not to damage mounting insulator.
lWhen installation directions are specified, install parts according to the direction marks on them referring
to components illustration.
lMake sure that each mounting insulator is seated properly, and tighten mounting bolts and nuts.
INSPECTION AFTER INSTALLATION
lBefore starting engine check the levels of coolant, lubrications and working oils. If less than required
quantity, fill to the specified level.
lRun engine to check for unusual noise and vibration.
lWarm up engine thoroughly to make sure there is no leakage of coolant, lubricants, working oil, fuel and
exhaust gas.
lBleed air from passages in pipes and tubes of applicable lines.
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EM-70
[QR20DE]
CYLINDER BLOCK
lWhile turning the crankshaft by hand, check that it turns smoothly.
6. Install the lower cylinder block.
lApply genuine liquid gasket or equivalent to positions shown
in the figure.
NOTE:
Cylinder block and lower cylinder block are machined together.
Neither of them can be replaced as a single unit.
CAUTION:
After liquid gasket is applied, rear oil seal installation must
be finished within 5 minutes. Therefore, the following pro-
cedure must be performed quickly.
7. Tighten lower cylinder block mounting bolts in the numerical
order in the figure by following the procedure below.
a. Apply new engine oil to threads and seat surfaces of mounting
bolts.
b. Tighten M10(0.39in) bolts in order from 1 to 10 with tightening
torqu 36.3 to 42.2N·m (3.7 to 4.3 kg-m, 27 to 31 ft-lb).
NOTE:
There are two more processes to complete the tightening of
mounting bolts(See step 9). However stop precesure here to
install rear oil seal.
8. Install rear oil seal.
CAUTION:
Complete this step within approximately 5 minutes after liq-
uid gasket is applied to the lower cylinder block.
lPress oil seal between cylinder block and crankshaft with a
suitable drift.
lBe careful not to touch the grease on the oil seal lip.
lBe careful not to cause scratches or burrs when pressing in
the oil seal.
lPress in rear oil seal to the position shown in the figure.
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