2004 INFINITI FX35 spark plug

SPARK PLUG (PLATINUM-TIPPED TYPE)
EM-43
[VQ35DE]
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Revision: 2004 November 2004 FX35/FX45
SPARK PLUG (PLATINUM-TIPPED TYPE)PFP:22401
Removal and InstallationABS004WI
REMOVAL
1. Remove engine cover with power tool. Refer to EM-19, "INTAKE MANIFOLD COLLECTOR" .
2. Remove ignition coil. Refer to EM-42, "
IGNITION COIL" .
3. Remove spark plug with spark plug wrench (commercial service
tool).
INSPECTION AFTER REMOVAL
Use standard type spark plug for normal condition.
The hot type spark plug is suitable when fouling occurs with the standard type spark plug under conditions
such as:

Frequent engine starts

Low ambient temperatures
The cold type spark plug is suitable when spark knock occurs with the standard type spark plug under condi-
tions such as:

Extended highway driving

Frequent high engine revolution
1. Ignition coil 2. Spark plug
SBIA0568E
SEM294A
MakeNGK
Standard typePLFR5A-11
Hot typePLFR4A-11
Cold typePLFR6A-11
Gap (Nominal) : 1.1 mm (0.043 in)

EM-44
[VQ35DE]
SPARK PLUG (PLATINUM-TIPPED TYPE)
Revision: 2004 November 2004 FX35/FX45
CAUTION:

Do not drop or shock spark plug.

Do not use a wire brush for cleaning.

If plug tip is covered with carbon, spark plug cleaner may
be used.

Checking and adjusting plug gap is not required between
change intervals.
INSTALLATION
Install in the reverse order of removal.Cleaner air pressure:
Less than 588 kPa (6 kg/cm
2 , 85 psi)
Cleaning time:
Less than 20 seconds
SMA773C
SMA806CA

EM-46
[VQ35DE]
FUEL INJECTOR AND FUEL TUBE
Revision: 2004 November 2004 FX35/FX45
REMOVAL
1. Remove engine cover with power tool. Refer to EM-19, "INTAKE MANIFOLD COLLECTOR" .
2. Release fuel pressure. Refer to EC-51, "
FUEL PRESSURE RELEASE" .
3. Remove fuel feed hose (with damper) from fuel sub-tube.
NOTE:
There is no fuel return route.
CAUTION:

While hoses are disconnected, plug them to prevent fuel
from draining.

Do not separate damper and hose.
4. When separating fuel feed hose (with damper) and centralized under-floor piping connection, disconnect
quick connector as the following:
a. Remove quick connector cap from quick connector connection
on right member side.
b. Disconnect fuel feed hose (with damper) from bracket hose
clamp.
c. Disconnect quick connector from centralized under-floor piping as the following:
CAUTION:
Disconnect quick connector by using quick connector release [SST: — (J-45488)], not by picking
out retainer tabs.
i. With the sleeve side of quick connector release facing quick connector, install quick connector release
onto centralized under-floor piping.
ii. Insert quick connector release into quick connector until sleeve
contacts and goes no further. Hold quick connector release on
that position.
CAUTION:
Inserting quick connector release hard will not disconnect
quick connector. Hold quick connector release where it
contacts and goes no further.
iii. Draw and pull out quick connector straight from centralized
under-floor piping.
CAUTION:

Pull quick connector holding “A” position as shown in
the figure.

Do not pull with lateral force applied. O-ring inside quick connector may be damaged.

Prepare container and cloth beforehand as fuel will leak out.

Avoid fire and sparks.

Keep parts away from heat source. Especially, be careful when welding is performed around
them.

Do not expose parts to battery electrolyte or other acids.

Do not bend or twist connection between quick connector and fuel feed hose (with damper) dur-
ing installation/removal.
KBIA1293E
PBIC2083E
PBIC1898E

EM-98
[VQ35DE]
CYLINDER HEAD
Revision: 2004 November 2004 FX35/FX45
CYLINDER HEADPFP:11041
On-Vehicle ServiceABS004X7
CHECKING COMPRESSION PRESSURE
1. Warm up engine thoroughly. Then, stop it.
2. Release fuel pressure. Refer to EC-51, "
FUEL PRESSURE RELEASE" .
3. Disconnect fuel pump fuse to avoid fuel injection during mea-
surement.
4. Remove engine cover with power tool. Refer to EM-19, "
INTAKE MANIFOLD COLLECTOR" .
5. Remove ignition coil and spark plug from each cylinder. Refer to EM-42, "
IGNITION COIL" and EM-43,
"SPARK PLUG (PLATINUM-TIPPED TYPE)" .
6. Connect engine tachometer (not required in use of CONSULT-ll).
7. Install compression gauge with compression gauge adapter
(commercial service tool) onto spark plug hole.

Use compression gauge adapter 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.
8. With accelerator pedal fully depressed, turn ignition switch to
“START” for cranking. When gauge pointer stabilizes, read the
compression pressure and engine rpm. Perform these steps to
check each cylinder.
Compression pressure:
Unit: kPa (kg/cm2 , psi) /rpm
CAUTION:
Always use a fully changed battery to obtain specified engine speed.

If engine speed is out of specified range, check battery liquid for proper gravity. Check engine speed
again with normal battery gravity.
SBIA0466E
PBIC0900E
SBIA0533E
Standard Minimum Deference limit between cylinders
1,275 (13.0, 185) / 300 981 (10.0, 142) / 300 98 (1.0, 14) / 300

CYLINDER HEAD
EM-99
[VQ35DE]
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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
EM-103
[VQ35DE]
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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