2008 INFINITI FX35 service

EM-102
< SERVICE INFORMATION >[VQ35DE]
CYLINDER HEAD
Temporary fitting means the status that engine is
adequately stable though the hoist is released
from hanging.
NOTE:
At the time of the start of this procedure front suspension member is removed, and cylinder head is
hanged by hoist with the engine slinger installed.
3. Release the hoist from hanging, then remove the engine slinger.
4. Remove the following parts:  Fuel tube and fuel injector assembly: Refer to EM-45, "
Component".
 Intake manifold: Refer to EM-24, "
Component".
 Exhaust manifold: Refer to EM-26, "
Component".
 Water inlet and thermostat assembly: Refer to CO-27, "
Component".
 Water outlet, water pipe and heater pipe: Refer to CO-29, "
Component".
5. Remove cylinder head bolts in reverse order as shown in the fig- ure with cylinder head bolt wrench (commercial service tool) and
power tool to remove cylinder heads (right and left banks).
6. Remove cylinder head gaskets.
INSPECTION AFTER REMOVAL
Cylinder Head Bolt s 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 new one.
 If reduction of outer diameter appear s in a position other than “d2”,
use it as “d2” point.
Cylinder Head Distortion
NOTE:
When performing this inspection, cylinder block distortion should be also checking. Refer to EM-138, "
Inspec-
tion After Disassembly".
1. Using a scraper, wipe off oil, scale, gasket, seal ant and carbon deposits from surface of cylinder head.
CAUTION:
Do not allow gasket fragme nts to enter engine oil or engine coolant passages.
PBIC2057E
Limit (“d1” – “d2”) : 0.11 mm (0.0043 in)
PBIC2480E
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CYLINDER HEADEM-103
< SERVICE INFORMATION > [VQ35DE]
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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 new cylinder head gaskets.
2. Turn crankshaft until No. 1 piston is set at TDC. Crankshaft key should line up with the right bank cylinder cen-
ter line as shown in the figure.
3. Install cylinder head follow the steps below to tighten cylinder head bolts in numerical order as shown in the figure with cylin-
der head bolts wrench (commercial service tool).
CAUTION:
If cylinder head bolts re-used, check their outer diameters
before installation. Refer to "Cylinder Head Bolts Outer
Diameter".
a. Apply new engine oil to threads and seat surfaces of cylinder head bolts.
b. Tighten all cylinder head bolts.
c. Completely loosen all cylinder head bolts.
CAUTION:
In step “c”, loosen bolts in reverse order of that indicated in
the figure.
d. Tighten all cylinder head bolts. Limit : 0.1 mm (0.004 in)
SEM861E
SEM532G
: 98.1 N·m (10 kg-m, 72 ft-lb)
: 0 N·m (0 kg-m, 0 ft-lb)
: 39.2 N·m (4.0 kg-m, 29 ft-lb)
PBIC2057E
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EM-104
< SERVICE INFORMATION >[VQ35DE]
CYLINDER HEAD
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 vi sual 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 cylinderhead.
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 incl uding engine coolant and engine oil. If less than required
quantity, fill to the specified level. Refer to MA-9, "
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 leak-
age at connection points.
- Start engine. With engine speed increased, che ck 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 leak age of fuel, exhaust gases, or any oil/fluids includ-
ing engine oil and engine coolant.
 Bleed air from lines and hoses of applic able 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
Items 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 —
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CYLINDER HEADEM-105
< SERVICE INFORMATION > [VQ35DE]
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Disassembly and AssemblyINFOID:0000000001325740
DISASSEMBLY
1. Remove spark plug with spark plug wrench (commercial service tool).
2. Remove valve lifter.
 Identify installation positions, and store them without mixing them up.
3. Remove valve collet.  Compress valve spring with the valve spring compressor, theattachment and the adapter (SST). Remove valve collet with a
magnet hand.
CAUTION:
When working, take care not to damage valve lifter holes.
4. Remove valve spring retainer, valve spring and valve spring seat.
5. Push valve stem to combustion chamber side, and remove valve.  Identify installation positions, and store them without mixing them up.
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
10. Cylinder head (right bank) 11. Valve seat 12. Valve (EXH)
13. Valve (INT) 14. Cylinder head (left bank)
PBIC2637E
PBIC1803E
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EM-106
< SERVICE INFORMATION >[VQ35DE]
CYLINDER HEAD
6. Remove valve oil seal using the valve oil seal puller (SST).
7. If valve seat must be replaced, refer to
EM-107, "
Inspection After Disassembly".
8. If valve guide must be replaced, refer to EM-107, "
Inspection After Disassembly".
9. Remove spark plug tube, as necessary.  Using a pliers, pull spark plug tube out of cylinder head.
CAUTION:
 Take care not to damage cylinder head.
 Once removed, 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-107, "Inspection After Disassembly".
2. When valve seat is removed, install it. Refer to EM-107, "
Inspection After Disassembly".
3. Install new valve oil seals as follows:
a. Apply new engine oil on valve oil seal joint and seal lip.
b. Install with the valve oil seal drift (SST) to match dimension in the figure.
4. Install valve spring seat.
5. Install valve.  Larger diameter valves are for intake side.NOTE:
Larger diameter valves are for intake side.
6. Install valve spring (uneven pitch type).  Install narrow pitch end (paint mark) to cylinder head side(valve spring seat side).
 Intake side and exhaust side valve springs are different. Install
them referring to the following paint mark collar.
7. Install valve spring retainer.
PBIC0884E
Height “H” (Without valve spring seat installed) Intake and exhaust : 14.3 - 14.9 mm (0.563 - 0.587 in)
PBIC2769E
Paint mark collarIntake and Exhaust : Blue
SEM085D
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CYLINDER HEADEM-107
< SERVICE INFORMATION > [VQ35DE]
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8. Install valve collet.
 Compress valve spring with the valve spring compressor, theattachment and the adapter (SST). Install valve collet with a
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.  Install it in the original position.
10. Install spark plug tube.  Press-fit spark plug tube as follows:
a. Remove old liquid gasket adhering to cylinder head mounting hole.
b. Apply sealant to area within approximately 12 mm (0.47 in) from edge of spark plug tube press-fit side.
Use Genuine High Strength Locking Sealant or equivalent. Refer to GI-44
.
c. Using 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 plugtube.
 After press-fitting, wipe o ff liquid gasket protruding onto
cylinder-head upper face.
11. Install spark plug with spark plug wrench (commercial service tool).
Inspection After DisassemblyINFOID:0000000001325741
VALVE DIMENSIONS
 Check the dimensions of each valv e. For the dimensions, refer to EM-149, "Standard and Limit".
 If dimensions are out of the standard, replace valve and check valve seat contact. Refer to "VALVE SEAT
CONTACT".
VALVE GUIDE CLEARANCE
Valve Stem Diameter
Measure the diameter of va lve stem with micrometer.
Valve Guide Inner Diameter
Measure the inner diameter of valve guide with an inside micrometer.
PBIC1803E
Standard press-fit height “H”:
: 38.1 - 39.1 mm (1.500 - 1.539 in)
PBIC2638E
StandardIntake : 5.965 - 5.980 mm (0.2348 - 0.2354 in)
Exhaust : 5.955 - 5.970 mm (0.2344 - 0.2350 in)
SEM938C
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EM-108
< SERVICE INFORMATION >[VQ35DE]
CYLINDER HEAD
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 "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 avo id 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
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CYLINDER HEADEM-109
< SERVICE INFORMATION > [VQ35DE]
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4. Heat cylinder head to 110 to 130
°C (230 to 266 °F) by soaking in
heated oil.
5. Using the valve guide drift (commercial service tool), press valve guide from camshaft side to the dimensions as in the figure.
WARNING:
Cylinder head contains heat . When working, wear protec-
tive equipment to avo id getting burned.
6. Using the valve guide reamer (commercial service tool), apply reamer finish to valve guide.
VALVE SEAT CONTACT
 After confirming that the dimensions of valve guides and valves arewithin the 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 surface.
 Check if the contact area band is continuous all around the circum-
ference.
 If not, grind to adjust valve fitting and check again. If the contacting surface still has “NG” conditions even after the re-check, replace
valve seat. Refer to "VALVE SEAT REPLACEMENT".
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 shoul d not continue beyond the bottom face of the seat recess
in cylinder head. Set the machine depth stop to ensure this. Refer to EM-149, "
Standard and Limit".
CAUTION:
Prevent to scratch cylinder head by excessive boring.
SEM008A
Projection “L”
Intake and exhaust : 12.6 - 12.8 mm (0.496 - 0.504 in)
SEM950E
Standard:Intake and exhaust : 6.000 - 6.018 mm (0.2362 - 0.2369 in)
SEM932C
SBIA0322E
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