Infiniti FX35 / FX45. Manual - part 648

CYLINDER HEAD

EM-109

< SERVICE INFORMATION >

[VQ35DE]

C

D

E

F

G

H

I

J

K

L

M

A

EM

N

P

O

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 avoid 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 are

within 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 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-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

EM-110

< SERVICE INFORMATION >

[VQ35DE]

CYLINDER HEAD

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-149, "Standard and Limit"

.

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 "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.

VALVE SPRING DIMENSIONS AND VALVE SPRING PRESSURE LOAD

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

CYLINDER HEAD

EM-111

< SERVICE INFORMATION >

[VQ35DE]

C

D

E

F

G

H

I

J

K

L

M

A

EM

N

P

O

• 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 exhaust

Free 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-112

< SERVICE INFORMATION >

[VQ35DE]

ENGINE ASSEMBLY

ENGINE ASSEMBLY

Component (2WD Models)

INFOID:0000000001325742

Removal and Installation (2WD Models)

INFOID:0000000001325743

WARNING:

• Situate the 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 unavoid-

able reasons, support at 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-37, "Garage Jack and

Safety Stand"

.

REMOVAL

Outline

1.

Engine mounting bracket (RH)

2.

Heat insulator (RH)

3.

Engine mounting insulator (RH)

4.

Engine mounting insulator (LH)

5.

Heat insulator (LH)

6.

Engine mounting bracket (LH)

7.

Harness bracket

8.

Engine mounting insulator (rear)

9.

Rear engine mounting member

PBIC3039E