2004 INFINITI FX35 seat

TIMING CHAIN
EM-77
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Revision: 2004 November 2004 FX35/FX45
12. Install internal chain guide and timing chain tensioner (primary).
13. Install slack guide.
CAUTION:
Do not overtighten slack guide mounting bolts. It is normal
for a gap to exist under the bolt seats when mounting bolts
are tightened to specification.
14. Install chain tensioner for slack guide.

When installing chain tensioner, push in sleeve and keep it
pressed in with stopper pin.

Remove any dirt and foreign materials completely from the
back and the mounting surfaces of chain tensioner.

After installation, pull out stopper pin by pressing slack guide.
15. Reconfirm that the mating marks on sprockets and timing chain have not slipped out of alignment.
SEM740G
SEM741G
SEM733G

EM-94
[VQ35DE]
OIL SEAL
Revision: 2004 November 2004 FX35/FX45
OIL SEALPFP:00100
Removal and Installation of Valve Oil SealABS004X4
REMOVAL
1. Remove camshaft relating to valve oil seal to be removed. Refer to EM-82, "CAMSHAFT" .
2. Remove valve lifters. Refer to EM-82, "
CAMSHAFT" .
3. Turn crankshaft until the cylinder requiring new oil seals is at TDC. This will prevent valve from dropping
into cylinder.
4. Using valve spring compressor, attachment and adapter (SST),
remove valve collet with magnet hand. Then remove valve
spring and valve spring seat.
5. Remove valve oil seal using valve oil seal puller (SST).
INSTALLATION
1. Apply engine oil on new valve oil seal joint and seal lip.
2. Using valve oil seal drift (SST), press fit valve seal to height “H”
shown in the figure.
NOTE:
Dimension “H”: Height measured before valve spring seat instal-
lation
3. Perform steps in the reverse order of removal for the following operations.
PBIC1803E
PBIC0884E
Intake and exhaust : 14.3 - 14.9 mm (0.563 - 0.587 in)
PBIC0802E

OIL SEAL
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Removal and Installation of Front Oil SealABS004X5
REMOVAL
1. Remove the following parts:

Front engine undercover (With power tool)

Drive belt; Refer to EM-15, "DRIVE BELTS" .
2. Remove crankshaft pulley with the following procedure:
a. Remove rear cover plate (2WD) or starter motor (AWD) and set
ring gear stopper (SST) as shown in the figure. Refer to SC-10,
"STARTING SYSTEM" .
b. Loosen crankshaft pulley bolt and locate bolt seating surface as
10 mm (0.39 in) from its original position.
CAUTION:
Do not remove crankshaft pulley bolt as it will be used as a
supporting point for suitable puller.
c. Place suitable puller tab on holes of crankshaft pulley, and pull
crankshaft pulley through.
CAUTION:
Do not put suitable puller tab on crankshaft pulley periph-
ery, as this will damage internal damper.
3. Remove front oil seal using a suitable tool.
CAUTION:
Be careful not to damage front timing chain case and crank-
shaft.
PBIC1098E
PBIC1103E
EMQ0477D
SEM829E

CYLINDER HEAD
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Revision: 2004 November 2004 FX35/FX45

If compression pressure is below minimum value, check valve clearances and parts associated with
combustion chamber (valve, valve seat, piston, piston ring, cylinder bore, cylinder head, cylinder head
gasket). After the checking, measure compression pressure again.

If some cylinders have low compression pressure, pour small amount of engine oil into spark plug hole
of cylinder to re-check it for compression.
–If the added engine oil improves the compression, piston rings may be worn out or damaged. Check
piston rings and replace if necessary.
–If the compression pressure remains at low level despite the addition of engine oil, valves may be mal-
functioning. Check valves for damage. Replace valve or valve seat accordingly.

If two adjacent cylinders have respectively low compression pressure and their compression remains
low even after the addition of engine oil, gaskets are leaking. In such a case, replace cylinder head gas-
kets.
9. After inspection is completed, install removed parts.
10. Start engine, and confirm that engine runs smoothly.
11. Perform trouble diagnosis. If DTC appears, erase it. Refer toEC-77, "
TROUBLE DIAGNOSIS" .
Removal and InstallationABS004X8
REMOVAL
1. Remove camshaft. Refer to EM-82, "CAMSHAFT" .
NOTE:
It is also possible to perform the following steps 2 and 3 just before removing camshaft.
2. Temporarily fit front suspension member to support engine.
CAUTION:
Temporary fitting means the status that engine is adequately stable though hoist is released from
hanging.
1. Engine rear lower slinger 2. Cylinder head (left bank) 3. Cylinder head bolt
4. Cylinder head (right bank) 5. Cylinder head gasket (right bank) 6. Cylinder head gasket (left bank)
7. Oil level gauge guide
SBIA0581E

EM-102
[VQ35DE]
CYLINDER HEAD
Revision: 2004 November 2004 FX35/FX45
d. Turn all bolts “90” degrees clockwise (angle tightening).
e. Turn all bolts “90” degrees clockwise again [target: 90 degrees
(angle tightening)].
CAUTION:
Check and confirm the tightening angle by using angle
wrench (SST) and cylinder head bolt wrench (commercial
service tool). Avoid judgment by visual inspection without
SST.

Check tightening angle indicated on angle wrench (SST) indi-
cator plate.
4. After installing cylinder head, measure distance between front
end faces of cylinder block and cylinder head (left and right
banks).

If measurement is outside the specified range, re-install cylin-
der head.
5. Perform steps in reverse order of removal for the following operations.
Disassembly and AssemblyABS004X9
PBIC0888E
Standard : 14.1 - 14.9 mm (0.555 - 0.587 in)
EMQ0662D
1. Valve lifter 2. Valve collet 3. Valve spring retainer
4. Valve spring 5. Valve oil seal 6. Valve spring seat
7. Valve guide 8. Spark plug 9. Spark plug tube
PBIC2308E

CYLINDER HEAD
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Revision: 2004 November 2004 FX35/FX45
DISASSEMBLY
1. Remove spark plug with spark plug wrench (commercial service tool).
2. Remove valve lifter.

Mark position on valve lifter for assembly.
3. Remove valve collet.

Compress valve spring with valve spring compressor, attach-
ment and adapter (SST). Remove valve collet with magnet
hand.
CAUTION:
When working, take care not to damage valve lifter holes.
4. Remove valve spring retainer and valve spring.
5. Push valve stem to combustion chamber side, and remove
valve.

Inspect valve guide clearance before removal. Refer to EM-
105, "VALVE GUIDE CLEARANCE" .

Mark position on valve for assembly.
6. Remove valve oil seals using valve oil seal puller (SST).
7. Remove valve spring seat.
8. If valve seat must be replaced, refer to EM-107, "
VALVE SEAT CONTACT" .
9. If valve guide must be replaced, refer to EM-105, "
VALVE GUIDE CLEARANCE" .
10. Remove spark plug tube, as necessary.

Using a pair of pliers, pull spark plug tube out of cylinder head.
CAUTION:

Take care not to damage cylinder head.

Once removed, a spark plug tube will be deformed and cannot be reused. Do not remove it
unless absolutely necessary.
ASSEMBLY
1. When valve guide is removed, install it. Refer to EM-105, "VALVE GUIDE CLEARANCE" .
2. When valve seat is removed, install it. Refer to EM-107, "
VALVE SEAT CONTACT" .
3. Install valve oil seals.

Install with valve oil seal drift (SST) to match dimension in
illustration.
4. Install valve spring seat.
10. Cylinder head (right bank) 11. Valve seat 12. Valve (EXH)
13. Valve (INT) 14. Cylinder head (left bank)
PBIC1803E
PBIC0884E
Height “H” (Without valve spring seat installed)
Intake and exhaust : 14.3 - 14.9 mm (0.563 - 0.587 in)
PBIC0802E

EM-104
[VQ35DE]
CYLINDER HEAD
Revision: 2004 November 2004 FX35/FX45
5. Install the valves.

Larger diameter valves are for intake side.
6. Install valve spring (uneven pitch type).

Install smaller pitch end (paint mark) to cylinder head side
(valve spring seat side).
7. Install valve spring retainer.
8. Install valve collet.

Compress valve spring with valve spring compressor, attach-
ment and adapter (SST). Install valve collet with magnet
hand.
CAUTION:
When working, take care not to damage valve lifter holes.

Tap valve stem edge lightly with plastic hammer after installa-
tion to check its installed condition.
9. Install valve lifter.
10. Install spark plug tube.

Press-fit spark plug tube following procedure below.
a. Remove old liquid gasket adhering to cylinder-head mounting
hole.
b. Apply liquid gasket to area within approximately 12 mm (0.47 in)
from edge of spark plug tube press-fit side.
Use Genuine RTV Silicone Sealant or equivalent. Refer to
GI-48, "
RECOMMENDED CHEMICAL PRODUCTS AND
SEALANTS" .
c. Using a drift, press-fit spark plug tube so that its height “H” is as
specified in the figure.
CAUTION:

When press-fitting, take care not to deform spark plug tube.

After press-fitting, wipe off liquid gasket protruding onto cylinder-head upper face.
11. Install spark plug.
Inspection After DisassemblyABS004XA
VALVE DIMENSIONS

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

If dimensions are out of the standard, replace valve.
SEM085D
PBIC1803E
Standard press-fit height “H”:
: 38.55 - 38.65 mm (1.5177 - 1.5217 in)
KBIA1248E
SEM188A

CYLINDER HEAD
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Revision: 2004 November 2004 FX35/FX45
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.
CAUTION:
Prevent to scratch cylinder head by excessive boring.
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 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. Force fit valve seat into cylinder head.
CAUTION:

Avoid directly touching cold valve seats.

Cylinder head contains heat. When working, wear protective equipment to avoid getting burned.
SBIA0322E
Oversize [0.5 mm (0.020 in)]
Intake: 38.500 - 38.516 mm (1.5157 - 1.5164 in)
Exhaust: 32.700 - 32.716 mm (1.2874 - 1.2880 in)
SEM795A
SEM008A