Pressure INFINITI FX35 2006 Service Manual

EM-102
[VQ35DE]
CYLINDER HEAD
Revision: 2006 December 2006 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 cylinder has 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, 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, cylinder head gaskets are leaking. In such a case, replace cyl-
inder head gaskets.
9. After inspection is completed, install removed parts.
10. Start the engine, and make sure that the engine runs smoothly.
11. Perform trouble diagnosis. If DTC appears, erase it. Refer to EC-88, "
TROUBLE DIAGNOSIS" .
ComponentsNBS003GX
Removal and InstallationNBS003GY
REMOVAL
1. Remove camshaft. Refer to EM-83, "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. Refer to FSU-17, "
FRONT SUSPENSION
MEMBER" .
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

CYLINDER HEAD EM-105
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Revision: 2006 December 2006 FX35/FX45
e. Turn all cylinder head bolts 90 degrees clockwise (angle tighten- ing).
CAUTION:
Check the tightening angle by using the angle wrench
(SST). Avoid judgment by visual inspection without SST.

Check tightening angle indicated on the angle wrench indica-
tor plate.
f. Turn all cylinder head bolts 90 degrees clockwise again (angle tightening).
4. After installing cylinder head, measure distance between front end faces of cylinder block and cylinder head (left and right
banks).

If measured value is out of the standard, re-install cylinder
head.
5. Install in the reverse order of removal after this step.
INSPECTION AFTER INSTALLATION
Inspection for Leaks
The following are procedures for checking fluids leak, lubricates leak and exhaust gases leak.

Before starting engine, check oil/fluid levels including engine coolant and engine oil. If less than required
quantity, fill to the specified level. Refer to MA-12, "
RECOMMENDED FLUIDS AND LUBRICANTS" .

Use procedure below to check for fuel leakage.
–Turn ignition switch “ON” (with engine stopped). With fuel pressure applied to fuel piping, check for fuel
leakage at connection points.
–Start engine. With engine speed increased, check again for fuel leakage at connection points.

Run engine to check for unusual noise and vibration.

Warm up engine thoroughly to make sure there is no leakage of fuel, exhaust gases, or any oil/fluids
including engine oil and engine coolant.

Bleed air from lines and hoses of applicable lines, such as in cooling system.

After cooling down engine, again check oil/fluid levels including engine oil and engine coolant. Refill to the
specified level, if necessary.
Summary of the inspection items:
* Transmission/transaxle/CVT fluid. power steering fluid, brake fluid, etc.
PBIC0888E
Standard : 14.1 - 14.9 mm (0.555 - 0.587 in)
EMQ0662D
Item Before starting engine Engine running After engine stopped
Engine coolant Level Leakage Level
Engine oil Level Leakage Level
Other oils and fluid* Level Leakage Level
Fuel Leakage Leakage Leakage
Exhaust gases — Leakage —

CYLINDER HEAD EM-109
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Revision: 2006 December 2006 FX35/FX45
Valve Guide Clearance
(Valve guide clearance) = (Valve guide inner diameter) – (Valve stem diameter)

If the calculated value exceeds the limit, replace valve and/or valve guide When valve guide must be
replaced, refer to EM-109, "
VALVE GUIDE REPLACEMENT" .
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 a hammer and the valve guide drift
(commercial service tool).
WARNING:
Cylinder head contains heat. When working, wear protec-
tive equipment to avoid getting burned.
3. Using the valve guide reamer (commercial service tool), ream cylinder head valve guide hole. 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 (0.0031 in)
Exhaust : 0.10 mm (0.0039 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-111
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Revision: 2006 December 2006 FX35/FX45
2. Ream cylinder head recess diameter for service valve seat.

Be sure to ream in circles concentric to 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. WARNING:
Cylinder head contains heat. When working, wear protective equipment to avoid getting burned.
CAUTION:
Avoid directly touching cold valve seats.
5. Using the valve seat cutter set (commercial service tool) or valve seat grinder, finish seat to the specified dimensions. Refer to
EM-157, "
Valve Seat" .
CAUTION:
When using the valve seat cutter, firmly grip 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 cutter or cutting many different times may
result in stage valve seat.
6. Using compound, grind to adjust valve fitting.
7. Check again for normal contact. Refer to EM-110, "
VALVE SEAT CONTACT" .
VALVE SPRING SQUARENESS

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

If it exceeds the limit, replace valve spring. 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
SEM934C
Limit : 2.1 mm (0.083 in)
PBIC0080E

EM-112
[VQ35DE]
CYLINDER HEAD
Revision: 2006 December 2006 FX35/FX45
VALVE SPRING DIMENSIONS AND VALVE SPRING PRESSURE LOAD

Check the valve spring pressure at specified spring height.

If the installation load or load with valve open is out of the standard, replace valve spring. Standard:
Intake and exhaustFree height: 47.07 mm (1.8531 in)
Installation height : 37.0 mm (1.457 in)
Installation load : 166 - 188 N (16.9 - 19.2 kg, 37 - 42 lb)
Height during valve open : 27.2 mm (1.071 in)
Load with valve open : 373 - 421 N (38.0 - 42.9 kg, 84 - 95 lb)
SEM113

EM-114
[VQ35DE]
ENGINE ASSEMBLY
Revision: 2006 December 2006 FX35/FX45
REMOVAL
Outline
At first, remove the engine and the transmission assembly with front suspension member downward. Then
separate the engine from transmission.
Preparation
1. Release fuel pressure. Refer to EC-86, "FUEL PRESSURE RELEASE" .
2. Drain engine coolant from radiator. Refer to CO-11, "
Changing Engine Coolant" .
CAUTION:

Perform this step when engine is cold.

Do not spill engine coolant on drive belts.
3. Disconnect both battery terminals. Refer to SC-4, "
BATTERY" .
4. Remove the following parts:

Engine cover; Refer to EM-19, "INTAKE MANIFOLD COLLECTOR" .

Front road wheel and tires

Front and rear engine undercover

Front cross bar; Refer to FSU-17, "FRONT SUSPENSION MEMBER" .

Cowl top cover (right); Refer to EI-23, "COWL TOP" .

Air duct and air cleaner case assembly; EM-17, "AIR CLEANER AND AIR DUCT" .
5. Discharge refrigerant from A/C circuit. Refer to ATC-137, "
REFRIGERANT LINES" .
6. Remove radiator hoses (upper and lower). Refer to CO-14, "
RADIATOR" .
Engine Room
1. Disconnect heater hose from vehicle-side, and fit a plug onto hose end to prevent engine coolant leak.
2. Disconnect grounding cable (between vehicle to left bank cylinder head).
3. Disconnect battery positive cable harness at vehicle side and temporarily fasten it on engine.
4. Disconnect A/C piping from A/C compressor, and temporarily fasten it on vehicle with a rope. Refer to ATC-137, "
REFRIGERANT LINES" .
5. Disconnect engine room harness connectors shown in the fig- ure.
6. Disconnect two body ground cables.
7. Disconnect brake booster vacuum hose.
8. Disconnect fuel feed hose (with damper) and EVAP hose. Refer to EM-45, "
FUEL INJECTOR AND FUEL
TUBE"
CAUTION:
Fit plugs onto disconnected hoses to prevent fuel leak.
9. Remove reservoir tank of power steering oil pump and piping from vehicle, and temporarily secure them on engine. Refer to PS-29, "
POWER STEERING OIL PUMP" .
CAUTION:
When temporarily securing, keep the reservoir tank upright to avoid a fluid leak.
Passenger Room Side
Follow procedure below to disconnect engine room harness connectors at passenger room side, and tempo-
rarily secure them on engine.
SBIA0472E

ENGINE ASSEMBLY EM-117
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Revision: 2006 December 2006 FX35/FX45

When installing engine mounting bracket (RH and LH) on cylin-
der block, tighten two upper bolts (shown as “A” in the figure)
first. Then tighten two lower bolts (shown as “B” in the figure).

Make sure all engine mounting insulators are seated properly, then tighten mounting nuts.

Tighten rear engine mounting member bolts in numerical order
as shown in the figure.
INSPECTION AFTER INSTALLATION
Inspection for Leaks
The following are procedures for checking fluids leak, lubricates leak and exhaust gases leak.

Before starting engine, check oil/fluid levels including engine coolant and engine oil. If less than required
quantity, fill to the specified level. Refer to MA-12, "
RECOMMENDED FLUIDS AND LUBRICANTS" .

Use procedure below to check for fuel leakage.
–Turn ignition switch “ON” (with engine stopped). With fuel pressure applied to fuel piping, check for fuel
leakage at connection points.
–Start engine. With engine speed increased, check again for fuel leakage at connection points.

Run engine to check for unusual noise and vibration.

Warm up engine thoroughly to make sure there is no leakage of fuel, exhaust gases, or any oil/fluids
including engine oil and engine coolant.

Bleed air from lines and hoses of applicable lines, such as in cooling system.

After cooling down engine, again check oil/fluid levels including engine oil and engine coolant. Refill to the
specified level, if necessary.
Summary of the inspection items:
* Transmission/transaxle/CVT fluid. power steering fluid, brake fluid, etc.
PBIC2062E
PBIC3040E
Item Before starting engine Engine running After engine stopped
Engine coolant Level Leakage Level
Engine oil Level Leakage Level
Other oils and fluid* Level Leakage Level
Fuel Leakage Leakage Leakage
Exhaust gases — Leakage —

ENGINE ASSEMBLY EM-119
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Revision: 2006 December 2006 FX35/FX45
REMOVAL
Outline
At first, remove the engine, the transmission assembly, the transfer assembly and the front final drive assem-
bly with front suspension member downward. Then separate the engine, the transmission assembly, the trans-
fer and the front final drive assembly.
Preparation
1. Release fuel pressure. Refer to EC-86, "FUEL PRESSURE RELEASE" .
2. Drain engine coolant from radiator. Refer to CO-11, "
Changing Engine Coolant" .
CAUTION:

Perform this step when engine is cold.

Do not spill engine coolant on drive belts.
3. Disconnect both battery terminals. Refer to SC-4, "
BATTERY" .
4. Remove the following parts:

Engine cover; Refer to EM-19, "INTAKE MANIFOLD COLLECTOR" .

Front road wheel and tires

Front and rear engine undercover

Front cross bar; Refer to FSU-17, "FRONT SUSPENSION MEMBER" .

Cowl top cover (right); Refer to EI-23, "COWL TOP" .

Air duct and air cleaner case assembly; EM-17, "AIR CLEANER AND AIR DUCT" .
5. Discharge refrigerant from A/C circuit. Refer to ATC-137, "
REFRIGERANT LINES" .
6. Remove radiator hoses (upper and lower). Refer to CO-14, "
RADIATOR" .
Engine Room
1. Disconnect heater hose from vehicle-side, and fit a plug onto hose end to prevent engine coolant leak.
2. Disconnect grounding cable (between vehicle to left bank cylinder head).
3. Disconnect battery positive cable harness at vehicle side and temporarily fasten it on engine.
4. Disconnect A/C piping from A/C compressor, and temporarily fasten it on vehicle with a rope. Refer to ATC-137, "
REFRIGERANT LINES" .
5. Disconnect engine room harness connectors shown in the fig- ure.
6. Disconnect two body ground cables.
7. Disconnect brake booster vacuum hose.
8. Disconnect fuel feed hose (with damper) and EVAP hose. Refer to EM-45, "
FUEL INJECTOR AND FUEL
TUBE"
CAUTION:
Fit plugs onto disconnected hoses to prevent fuel leak.
9. Remove reservoir tank of power steering oil pump and piping from vehicle, and temporarily secure them on engine. Refer to PS-29, "
POWER STEERING OIL PUMP" .
CAUTION:
When temporarily securing, keep the reservoir tank upright to avoid a fluid leak.
Passenger Room Side
Follow procedure below to disconnect engine room harness connectors at passenger room side, and tempo-
rarily secure them on engine.
SBIA0472E

EM-122
[VQ35DE]
ENGINE ASSEMBLY
Revision: 2006 December 2006 FX35/FX45

Do not allow engine mounting insulator to be damage and careful no engine oil gets on it.

For a location with a positioning pin, insert it securely into hole of mating part.

For a part with a specified installation orientation, refer to component figure in EM-118, "Components
(AWD Models)" .

When installing engine mounting bracket (RH and LH) on cylin-
der block, tighten two upper bolts (shown as “A” in the figure)
first. Then tighten two lower bolts (shown as “B” in the figure).

Install engine mounting bracket (RH) (lower) as follows:
–Temporarily tighten mounting bolts (shown as “C”, “D” and “E” in
the figure).
–Tighten mounting bolts to the specified torque with following
mounting surfaces touched.
 Engine mounting bracket (RH) to engine mounting bracket (RH) (lower) (shown as “C” and “D” in figure).
 Front final drive to engine mounting bracket (RH) (lower) (shown as “E” in figure).

Make sure all engine mounting insulators are seated properly,
then tighten mounting nuts.
INSPECTION AFTER INSTALLATION
Inspection for Leaks
The following are procedures for checking fluids leak, lubricates leak and exhaust gases leak.

Before starting engine, check oil/fluid levels including engine coolant and engine oil. If less than required
quantity, fill to the specified level. Refer to MA-12, "
RECOMMENDED FLUIDS AND LUBRICANTS" .

Use procedure below to check for fuel leakage.
–Turn ignition switch “ON” (with engine stopped). With fuel pressure applied to fuel piping, check for fuel
leakage at connection points.
–Start engine. With engine speed increased, check again for fuel leakage at connection points.

Run engine to check for unusual noise and vibration.

Warm up engine thoroughly to make sure there is no leakage of fuel, exhaust gases, or any oil/fluids
including engine oil and engine coolant.

Bleed air from lines and hoses of applicable lines, such as in cooling system.

After cooling down engine, again check oil/fluid levels including engine oil and engine coolant. Refill to the
specified level, if necessary.
Summary of the inspection items:
* Transmission/transaxle/CVT fluid. power steering fluid, brake fluid, etc.
PBIC3042E
Item Before starting engine Engine running After engine stopped
Engine coolant Level Leakage Level
Engine oil Level Leakage Level
Other oils and fluid* Level Leakage Level
Fuel Leakage Leakage Leakage
Exhaust gases — Leakage —

SERVICE DATA AND SPECIFICATIONS (SDS) EM-151
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Revision: 2006 December 2006 FX35/FX45
SERVICE DATA AND SPECIFICATIONS (SDS)PFP:00100
Standard and LimitNBS003H9
GENERAL SPECIFICATIONS
Cylinder arrangement V- 6
Displacement cm
3 (cu in) 3,498 (213.45)
Bore and stroke mm (in) 95.5 x 81.4 (3.760 x 3.205)
Valve arrangement DOHC
Firing order 1-2-3-4-5-6
Number of piston rings Compression 2
Oil 1
Number of main bearings 4
Compression ratio 10.3
Compression pressure
kPa (kg/cm
2 , psi)/300 rpm Standard 1,275 (13.0, 185)
Minimum 981 (10.0, 142)
Differential limit between cylinders 98 (1.0, 14)
Cylinder number
Valve timing
(Intake valve timing control - “OFF”)
Unit: degree
abcde f
240 238 −664 8 52
SEM713A
PBIC0187E