NISSAN X-TRAIL 2003 Service Repair Manual

CYLINDER HEAD
EM-69
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7. Remove cylinder head loosening bolts in reverse order as
shown in the figure.

Using the following tool, loosen cylinder head bolts.
NOTE:
There are two types of cylinder head bolt because of parallel
manufacture.
8. Remove cylinder head gasket.
INSPECTION AFTER REMOVAL
Cylinder Head Bolts Outer Diameter

Cylinder head bolts are tightened by plastic zone tightening
method. Whenever the size difference between “d1” and “d2”
exceeds the limit, replace them with a new one.

If reduction of outer diameter appears in a position other than
“d2”, use it as “d2” point.
NOTE:
When replacing any cylinder head bolts, it is possible to use them
with mixing flange bolt and bolt with washer.
Cylinder Head Distortion
NOTE:
When performing this inspection, cylinder block distortion should be also checking. Refer to EM-102, "
CYLIN-
DER BLOCK DISTORTION" .
1. Wipe off engine oil and remove water scale (like deposit), gasket, sealant, carbon, etc. with a scraper.
CAUTION:
Use utmost care not to allow gasket debris to enter passages for engine oil or water.
2. At each of several locations on bottom surface of cylinder head,
measure the distortion in six directions.

If it exceeds the limit, replace cylinder head.
INSTALLATION
1. Install cylinder head gasket.Bolt with washer
:Hexagonal wrench [size 10 mm (0.39 in)]
Flange bolt
:TORX socket (size E20)
KBIA0058E
Limit (“d1” – “d2”): 0.23 mm (0.0091 in)
SBIA0269E
Limit: 0.1 mm (0.004 in)
PBIC0075E

EM-70
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CYLINDER HEAD

2. Tighten cylinder head bolts in numerical order as shown in figure
with the following procedure, and install cylinder head.
CAUTION:
If cylinder head bolts are re-used, check their outer diame-
ters before installation. Refer to EM-69, "
Cylinder Head
Bolts Outer Diameter" .
a. Apply new engine oil to threads and seating surface of mounting
bolts.
b. Tighten all bolts.
c. Turn all bolts 60 degrees clockwise (angle tightening).
d. Completely loosen.
CAUTION:
In this step, loosen bolts in reverse order of that indicated in the figure.
e. Tighten all bolts.
f. Turn all bolts 75 degrees clockwise (angle tightening).
g. Turn all bolts 75 degrees clockwise again (angle tightening).
CAUTION:
Check and confirm the tightening angle by using an angle
wrench (special service tool) or protractor. Avoid judgment
by visual inspection without the tool.
3. Install in the reverse order of removal after this step. : 5.0 N·m (0.51 kg-m, 4 ft-lb)
: 0 N·m (0 kg-m, 0 ft-lb)
: 39.2 N·m (4.0 kg-m, 29 ft-lb)
KBIA0058E
KBIA0059E

CYLINDER HEAD
EM-71
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Disassembly and AssemblyEBS00KNR
DISASSEMBLY
1. Remove spark plug with spark plug wrench (commercial service tool).
2. Remove spark plug tube, if necessary.

Using pliers, remove it from cylinder head.
CAUTION:

Be careful not to damage cylinder head.

Do not remove spark plug tube if not necessary. Once removed, spark plug tube cannot be
reused because of deformation.
3. Remove valve lifter.

Identify installation positions, and store them without mixing them up.
4. Remove valve collet.

Compress valve spring with valve spring compressor, attach-
ment and adapter (special service tool). Remove valve collet
with a magnet hand.
CAUTION:
When working, be careful not to damage valve lifter holes.
1. Valve collet 2. Valve spring retainer 3. Valve spring (with valve spring seat)
4. Valve oil seal 5. Valve guide 6. Cylinder head
7. Valve seat 8. Valve (INT) 9. Valve (EXH)
10. Spark plug tube 11. Spark plug
PBIC2186E
PBIC1791E

EM-72
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CYLINDER HEAD

5. Remove valve spring retainer and valve spring (with valve spring seat).
CAUTION:
Do not remove valve spring seat from valve spring.
6. Push valve stem to combustion chamber side, and remove valve.

Identify installation positions, and store them without mixing them up.
7. Remove valve oil seal with a valve oil seal puller (special service
tool).
8. When valve seat must be replaced, refer to EM-75, "
VALVE SEAT REPLACEMENT" to removal.
9. When valve guide must be replaced, refer to EM-74, "
VALVE GUIDE REPLACEMENT" to removal.
ASSEMBLY
1. Install valve guide if removed. Refer to EM-74, "VALVE GUIDE REPLACEMENT" .
2. Install valve seat if removed. Refer to EM-75, "
VALVE SEAT REPLACEMENT" .
3. Install valve oil seal.

Install with a valve oil seal drift (special service tool) to match
dimension in the figure.
NOTE:
Dimension “H” is height that measured before installing valve
spring (with valve spring seat).
4. Install valve.

Install larger diameter to intake side.
5. Install valve spring (with valve spring seat).

Install smaller pitch (valve spring seat side) to cylinder head
side.

Confirm identification color of valve spring.
6. Install valve spring retainer.
7. Install valve collet.
SEM093F
Height “H” : 11.8 - 12.4 mm (0.465 - 0.488 in)
KBIA1999J
Intake : Blue
Exhaust : Yellow
PBIC0525E

CYLINDER HEAD
EM-73
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Compress valve spring with a valve spring compressor,
attachment and adapter (special service tool). Install valve
collet with a magnet hand.
CAUTION:
When working, be careful not to damage valve lifter
holes.

Tap valve stem edge lightly with a plastic hammer after instal-
lation to check its installed condition.
8. Install valve lifter.
9. Install spark plug tube if removed.

Press-fit it into cylinder head with the following procedure:
a. Remove old liquid gasket from cylinder head side installation
hole.
b. Apply liquid gasket all round on spark plug tube within approxi-
mately 12 mm (0.47 in) width from edge of spark plug tube on
the press-fit side.
Use Genuine Liquid Gasket or equivalent.
c. Using a drift, press-fit spark plug tube so that height is as same
as “H” shown in figure.
CAUTION:

When press-fitting, be careful not to deform spark plug tube.

After press-fitting, wipe off any protruding liquid gasket on top surface of cylinder head.
10. Install spark plug with spark plug wrench (commercial service tool).
Inspection After DisassemblyEBS00KNS
VALVE DIMENSIONS

Check dimensions of each valve. For dimensions, refer to EM-
11 0 , "Valve Dimensions" .

If dimensions are out of the standard, replace valve.
VALVE GUIDE CLEARANCE
Valve Stem Diameter
Measure the diameter of valve stem with a micrometer.
PBIC1791E
Standard press-fit height “H”:
41.2 - 42.2 mm (1.622 - 1.661 in)
SBIA0252E
SEM188A
Standard
Intake : 5.965 - 5.980 mm (0.2348 - 0.2354 in)
Exhaust : 5.955 - 5.970 mm (0.2344 - 0.2350 in)
SEM938C

EM-74
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CYLINDER HEAD

Valve Guide Inner Diameter
Measure the inner diameter of valve guide with a bore gauge.
Valve Guide Clearance
(Valve guide clearance) = (Valve guide inner diameter) – (Valve stem diameter).

If it exceeds the limit, replace valve guide and/or valve.
VALVE GUIDE REPLACEMENT
When valve guide is removed, replace with oversized [0.2 mm (0.008 in)] valve guide.
1. To remove valve guide, heat cylinder head to 110 to 130°C (230
to 266°F) by soaking in heated oil.
2. Drive out valve guide with a press [under a 20 kN (2 ton, 2.2 US
ton, 2.0 lmp ton) pressure] or hammer and suitable tool.
CAUTION:
Cylinder head contains heat, when working, wear protective
equipment to avoid getting burned.
3. Ream cylinder head valve guide hole with a valve guide reamer
(commercial service tool).Standard
Intake and Exhaust
: 6.000 - 6.018 mm (0.2362 - 0.2369 in)
Valve guide clearance:
Standard
Intake : 0.020 - 0.053 mm (0.0008 - 0.0021 in)
Exhaust : 0.030 - 0.063 mm (0.0012 - 0.0025 in)
Limit
Intake : 0.08 mm (0.003 in)
Exhaust : 0.09 mm (0.004 in)
SEM008A
SEM931C
Valve guide hole diameter (for service parts):
Intake and exhaust
: 10.175 - 10.196 mm (0.4006 - 0.4014 in)
SEM932C

CYLINDER HEAD
EM-75
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4. Heat cylinder head to 110 to 130°C (230 to 266°F) by soaking in
heated oil.
5. Press valve guide from camshaft side to dimensions as shown
in the figure.
CAUTION:
Cylinder head contains heat, when working, wear protective
equipment to avoid getting burned.
6. Apply reamer finish to valve guide with a valve guide reamer
(commercial service tool).
VALVE SEAT CONTACT

After confirming that the dimensions of valve guides and valves
are within specifications, perform this procedure.

Apply prussian blue (or white lead) onto contacting surface of
valve seat to check the condition of the valve contact on the sur-
face.

Check if the contact area band is continuous all around the cir-
cumference.

If not, grind to adjust valve fitting and check again. If the contact-
ing surface still has NG conditions even after the re-check,
replace valve seat.
VALVE SEAT REPLACEMENT
When valve seat is removed, replace with oversized [0.5 mm (0.020 in)] valve seat.
1. Bore out old seat until it collapses. Boring should not continue beyond the bottom face of the seat recess
in cylinder head. Set the machine depth stop to ensure this. Refer to EM-113, "
Va l v e S e a t" .
SEM008A
Projection “H”:
Intake : 10.1 - 10.3 mm (0.398 - 0.406 in)
Exhaust : 10.0 - 10.4 mm (0.394 - 0.409 in)
PBIC2187E
Standard
Intake and exhaust:
6.000 - 6.018 mm (0.2362 - 0.2369 in)
SEM932C
SBIA0322E

EM-76
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CYLINDER HEAD

2. Ream cylinder head recess diameter for service valve seat.

Be sure to ream in circles concentric to the valve guide center.
This will enable valve seat to fit correctly.
3. Heat cylinder head to 110 to 130°C (230 to 266°F) by soaking in
heated oil.
4. Provide valve seats cooled well with dry ice. Press-fit valve seat into cylinder head.
CAUTION:

Avoid directly to touching cold valve seats.

Cylinder head contains heat, when working, wear protective equipment to avoid getting burned.
5. Using valve seat cutter set (commercial service tool) or valve
seat grinder, finish valve seat to the specified dimensions.
CAUTION:
When using valve seat cutter, firmly grip the cutter handle
with both hands. Then, press on the contacting surface all
around the circumference to cut in a single drive. Improper
pressure on with the cutter or cutting many different times
may result in stage valve seat.

Grind to obtain the dimensions indicated in the figure.
*1 : Diameter made by intersection point of conic angles 60 degrees and 89.5 degrees
*2 : Diameter made by intersection point of conic angles 89.5 degrees and 120 degrees
*3 : 120 degrees cutter diameter
6. Using compound, grind to adjust valve fitting. Oversize [0.5 mm (0.020 in)]
Intake : 37.000 - 37.016 mm (1.4567 - 1.4573 in)
Exhaust : 32.000 - 32.016 mm (1.2598 - 1.2605 in)
SEM795A
SEM008A
SEM934C
Standard
D1 dia.
: 33.5 mm (1.319 in)
*1
D2 dia.
: 35.1 - 35.3 mm (1.382 - 1.390 in)*2
D3 dia.
: 39.0 - 39.2 mm (1.535 - 1.543 in)*3
D4 dia.
: 28.0 mm (1.102 in)*1
D5 dia.
: 29.9 - 30.1 mm (1.177 - 1.185 in)*2
D6 dia.
: 33.5 - 33.7mm (1.319 - 1.327 in)*3SBIA0226E

CYLINDER HEAD
EM-77
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7. Check again for normal contact. Refer to EM-75, "VALVE SEAT CONTACT" .
VALVE SPRING SQUARENESS

Set try square along the side of valve spring and rotate the
spring. Measure the maximum clearance between the top face
of spring and try square.

If it exceeds the limit, replace valve spring.
VALVE SPRING DIMENSIONS AND VALVE SPRING PRESSURE LOAD

Check valve spring pressure with valve spring seat installed at
specified spring height.
CAUTION:
Do not remove valve spring seat from valve spring.
Standard:

If the installation load or load with valve open is out of the standard, replace valve spring.Limit : 1.9 mm (0.075 in)
PBIC0080E
SEM113
Items INTAKE EXHAUST
Free height 44.84 - 45.34 mm (1.7654 - 1.7850 in) 45.28 - 45.78 mm (1.7827 - 1.8024 in)
Installation height 35.30 mm (1.390 in) 35.30 mm (1.390 in)
Installation load 151 - 175 N (15.4 - 17.8 kg, 34 - 39 lb) 151 - 175 N (15.4 - 17.8 kg, 34 - 39 lb)
Height during valve open 24.94 mm (0.9819 in) 26.39 mm (1.0390 in)
Load with valve open 358 - 408 N (36.5 - 41.6 kg, 80 - 92 lb) 325 - 371 N (33.1 - 37.8 kg, 73 - 83 lb)
Identification color Blue Yellow

EM-78
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ENGINE ASSEMBLY

ENGINE ASSEMBLYPFP:10001
Removal and InstallationEBS00KNT
WARNING:

Situate vehicle on a flat and solid surface.

Place chocks at front and back of rear wheels.

For engines not equipped with engine slingers, attach proper slingers and bolts described in
PARTS CATALOG.
CAUTION:

Always be careful to work safely, avoid forceful or uninstructed operations.

Do not start working until exhaust system and engine coolant are cool enough.

If items or work required are not covered by the engine section, refer to the applicable sections.

Always use the support point specified for lifting.

Use either 2-pole lift type or separate type lift as best you can. If board-on type is used for
unavoidable reasons, support at the rear axle jacking point with transmission jack or similar tool
before starting work, in preparation for the backward shift of center of gravity.

For supporting points for lifting and jacking point at rear axle, refer to GI-36, "Garage Jack and
Safety Stand" .
REMOVAL
Outline
Remove engine, transaxle and transfer assembly with front suspension member from vehicle downward. Sep-
arate front suspension member, and then separate engine and transaxle.
1. Rear engine mounting insulator 2. Rear engine mounting bracket 3. RH engine mounting insulator
4. RH engine mounting bracket 5. Front engine mounting bracket 6. Front engine mounting insulator
7. Center member 8. LH engine mounting insulator 9. LH engine mounting bracket
10. Stopper 11. Grommet
PBIC2392E