Exhaust INFINITI FX35 2006 Service Manual

EM-26
[VQ35DE]
EXHAUST MANIFOLD AND THREE WAY CATALYST
Revision: 2006 December 2006 FX35/FX45
EXHAUST MANIFOLD AND THREE WAY CATALYSTPFP:14004
ComponentsNBS003G9
Removal and InstallationNBS003GA
REMOVAL
WARNING:
Perform the work when the exhaust and cooling system have completely cooled down.
1. Remove engine cover with power tool. Refer to EM-19, "
INTAKE MANIFOLD COLLECTOR" .
2. Drain engine coolant. Refer to CO-11, "
Changing Engine Coolant" .
CAUTION:

Perform this step when the engine is cold.

Do not spill engine coolant on drive belts.
3. Remove air cleaner case and air duct. Refer to EM-17, "
AIR CLEANER AND AIR DUCT" .
4. Remove front and rear engine undercover and front cross bar with power tool.
5. Disconnect heated oxygen sensors 2 (bank 1 and bank 2) harness connectors.
1. Heated oxygen sensor 2 (bank 1) 2. Three way catalyst (right bank) 3. Gasket
4. Air fuel ratio sensor 1 (bank 1) 5. Exhaust manifold cover (right bank) 6. Exhaust manifold (right bank)
7. Exhaust manifold (left bank) 8. Exhaust manifold cover (left bank) 9. Three way catalyst (left bank)
10. Air fuel ratio sensor 1 (bank 2) 11. Heated oxygen sensor 2 (bank 2)
PBIC3103E

EXHAUST MANIFOLD AND THREE WAY CATALYST EM-27
[VQ35DE]
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Revision: 2006 December 2006 FX35/FX45
6. Using the heated oxygen sensor wrench (SST), remove heated oxygen sensors 2 (bank 1 and bank 2).
CAUTION:

Be careful not to damage heated oxygen sensor.

Discard any heated oxygen sensor which has been
dropped onto a hard surface such as a concrete floor;
replace with a new sensor.
7. Remove exhaust mounting bracket between three way catalysts (right and left bank) and transmission. Refer to EX-3, "
EXHAUST SYSTEM" .
8. Remove three way catalysts (right and left bank).
9. Disconnect air fuel ratio sensor 1 (bank 1 and bank 2) harness connectors and remove harness clip.
10. Using the heated oxygen sensor wrench (SST), remove air fuel ratio sensor 1 (bank 1 and bank 2).
CAUTION:

Be careful not to damage air fuel ratio sensor.

Discard any air fuel ratio sensor which has been dropped
onto a hard surface such as a concrete floor; replace with
a new sensor.
11. Remove water pipe and heater pipe on both right and left side. Refer to CO-29, "
WATER OUTLET AND
WATER PIPING" .
12. Remove exhaust manifold cover (right and left bank).
13. Loosen mounting nuts in the reverse order as shown in the fig- ure to remove exhaust manifold with power tool.
NOTE:
Disregard the numerical order No. 7 and 8 in removal.
14. Remove gaskets. CAUTION:
Cover engine openings to avoid entry of foreign materials.
KBIA1740E
SBIA0575E
PBIC2042E

EM-28
[VQ35DE]
EXHAUST MANIFOLD AND THREE WAY CATALYST
Revision: 2006 December 2006 FX35/FX45
INSPECTION AFTER REMOVAL
Surface Distortion

Check the surface distortion of the exhaust manifold mating sur-
face with a straightedge and a feeler gauge.

If it exceeds the limit, replace exhaust manifold.
INSTALLATION
Note the following, and install in the reverse order of removal.
Exhaust Manifold Gasket

Install in direction shown below. (Follow same procedure for
both banks.)

Locate thick side of port connecting part on right side from tech-
nician’s view.

Locate round press in thick side of port connecting part above
center level line of port.
Exhaust Manifold

If stud bolts were removed, install them and tighten to the specified torque below.

Install exhaust manifold and tighten mounting bolts in numerical
order as shown in the figure.
NOTE:
Tighten nuts No. 1 and 2 in two steps. The numerical order No. 7
and 8 shows second step. Limit : 0.3 mm (0.012 in)
PBIC1096E
KBIA1051E
: 14.7 N·m (1.5 kg-m, 11 ft-lb)
PBIC2042E

EXHAUST MANIFOLD AND THREE WAY CATALYST EM-29
[VQ35DE]
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Revision: 2006 December 2006 FX35/FX45
Air Fuel Ratio Sensor and Heated Oxygen Sensor
CAUTION:

Before installing a new air fuel ratio sensor and new heated oxygen sensor, clean exhaust system
threads using heated oxygen sensor thread cleaner tool (Commercial Service Tool: J-43897-18 or
J-43897-12) and apply anti-seize lubricant.

Do not over torque air fuel ratio sensor and heated oxygen sensor. Doing so may cause damage to
air fuel ratio sensor and heated oxygen sensor, resulting in the “MIL” coming on.

FRONT TIMING CHAIN CASE EM-55
[VQ35DE]
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Revision: 2006 December 2006 FX35/FX45
16. Remove collared O-ring from front timing chain case (left and right side).
17. Remove rocker covers (right and left banks). Refer to EM-51, "
ROCKER COVER" .
NOTE:
When only timing chain (primary) is removed, rocker cover does not need to be removed.
18. Obtain No. 1 cylinder at TDC of its compression stroke as follows:
NOTE:
When timing chain is not removed/installed, this step is not required.
a. Rotate crankshaft pulley clockwise to align timing mark (grooved line without color) with timing indicator.
b. Make sure that intake and exhaust cam noses on No. 1 cylinder (engine front side of right bank) are located as shown in the fig-
ure.

If not, turn crankshaft one revolution (360 degrees) and align
as shown in the figure.
NOTE:
When only timing chain (primary) is removed, rocker cover does
not need to be removed. To make sure that No. 1 cylinder is at
its compression TDC, remove front timing chain case first. Then
check mating marks on camshaft sprockets. Refer to EM-72,
"INSTALLATION" .
19. Remove crankshaft pulley as follows:
a. Remove rear cover plate (2WD) or starter motor (AWD) and set ring gear stopper (SST) as shown in the figure. Refer to SC-8,
"STARTING SYSTEM" .
PBIC2631E
KBIA1717J
SEM418G
PBIC1098E

EM-66
[VQ35DE]
TIMING CHAIN
Revision: 2006 December 2006 FX35/FX45

Loosen mounting bolts in reverse order as shown in the fig-
ure.

U s e t h e s e a l c u t t e r [ S S T: K V 1 0 1111 0 0 ( J 3 7 2 2 8 ) ] t o c u t l i q u i d
gasket for removal.
CAUTION:
Shaft is internally jointed with camshaft sprocket (INT) cen-
ter hole. When removing, keep it horizontal until it is com-
pletely disconnected.
19. Remove collared O-ring from front timing chain case (left and right side).
20. Remove rocker covers (right and left). Refer to EM-51, "
ROCKER COVER" .
21. Remove oil pans (lower and upper). Refer to EM-30, "
OIL PAN AND OIL STRAINER" .
22. Obtain No. 1 cylinder at TDC of its compression stroke as follows:
a. Rotate crankshaft pulley clockwise to align timing mark (grooved line without color) with timing indicator.
b. Make sure that intake and exhaust cam noses on No. 1 cylinder (engine front side of right bank) are located as shown in the fig-
ure.

If not, turn crankshaft one revolution (360 degrees) and align
as shown in the figure.
23. Remove crankshaft pulley as follows:
SEM728G
PBIC2631E
KBIA1717J
SEM418G

TIMING CHAIN EM-75
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Revision: 2006 December 2006 FX35/FX45
g. After installing rear timing chain case, check the surface height difference between the following parts on the oil pan (upper)
mounting surface.

If not within the standard, repeat the installation procedure.
3. Install water pump with new O-rings. Refer to CO-22, "
WATER PUMP" .
4. Make sure that dowel pin hole, dowel pin and crankshaft key are located as shown in the figure. (No. 1 cylinder at compression
TDC)
NOTE:
Though camshaft does not stop at the position as shown in the
figure, for the placement of cam nose, it is generally accepted
camshaft is placed for the same direction of the figure.
CAUTION:
Hole on small dia. side must be used for intake side dowel pin hole. Do not misidentify (ignore big
dia. side).
5. Install timing chains (secondary) and camshaft sprockets as follows:
CAUTION:
Mating marks between timing chain and sprockets slip easily. Confirm all mating mark positions
repeatedly during the installation process.
a. Push plunger of timing chain tensioner (secondary) and keep it pressed in with a stopper pin. Standard
Rear timing chain case to cylinder block: –0.24 to 0.14 mm (–0.009 to 0.006 in)
SEM943G
Camshaft dowel pin hole (intake side): At cylinder head upper face side in each bank.
Camshaft dowel pin (exhaust side) : At cylinder head upper face side in each bank.
Crankshaft key : At cylinder head side of right bank.
KBIA1073E
SEM430G

EM-76
[VQ35DE]
TIMING CHAIN
Revision: 2006 December 2006 FX35/FX45
b. Install timing chains (secondary) and camshaft sprockets.

Align the mating marks on timing chain (secondary) (gold link)
with the ones on intake and exhaust camshaft sprockets
(punched), and install them.
NOTE:

Mating marks for intake camshaft sprocket are on the back
side of camshaft sprocket (secondary).

There are two types of mating marks, circle and oval types.
They should be used for the right and left banks, respec-
tively.

Align dowel pin and pin hole on camshafts with the groove
and dowel pin on sprockets, and install them.

On the intake side, align pin hole on the small diameter side of
the camshaft front end with dowel pin on the back side of
camshaft sprocket, and install them.

On the exhaust side, align dowel pin on camshaft front end
with pin groove on camshaft sprocket, and install them.

In case that positions of each mating mark and each dowel
pin are not fit on mating parts, make fine adjustment to the
position holding the hexagonal portion on camshaft with wrench or equivalent.

Mounting bolts for camshaft sprockets must be tightened in the next step. Tightening them by hand is
enough to prevent the dislocation of dowel pins.

It may be difficult to visually check the dislocation of mating
marks during and after installation. To make the matching
easier, make a mating mark on the top of sprocket teeth and
its extended line in advance with paint.
c. After confirming the mating marks are aligned, tighten camshaft sprocket mounting bolts.

Secure camshaft using a wrench at the hexagonal portion to
tighten mounting bolts. Right bank : Use circle type.
Left bank : Use oval type.
PBIC2981E
PBIC0891E
KBIA1698J

EM-86
[VQ35DE]
CAMSHAFT
Revision: 2006 December 2006 FX35/FX45
Camshaft Cam Height
1. Measure the camshaft cam height with a micrometer.
2. If wear exceeds the limit, replace camshaft.
Camshaft Journal Oil Clearance
CAMSHAFT JOURNAL DIAMETER

Measure the outer diameter of camshaft journal with a microme-
ter.
CAMSHAFT BRACKET INNER DIAMETER

Tighten camshaft bracket bolt with the specified torque. Refer to EM-88, "INSTALLATION" for the tighten-
ing procedure.

Measure inner diameter “A” of camshaft bracket with a bore
gauge.
CAMSHAFT JOURNAL OIL CLEARANCE

(Oil clearance) = (Camshaft bracket inner diameter) – (Camshaft journal diameter).

If the calculated value exceeds the limit, replace either or both camshaft and cylinder head.
NOTE:
Camshaft brackets cannot be replaced as single parts, because there are machined together with cylinder
head. Replace whole cylinder head assembly. Standard cam height (intake and exhaust)
: 44.865 - 45.055 mm (1.7663 - 1.7738 in)
Cam wear limit : 0.2 mm (0.008 in)
EMQ0072D
Standard:No. 1 : 25.935 - 25.955 mm (1.0211 - 1.0218 in)
No. 2, 3, 4 : 23.445 - 23.465 mm (0.9230 - 0.9238 in)
PBIC0040E
Standard: No. 1 : 26.000 - 26.021 mm (1.0236 - 1.0244 in)
No. 2, 3, 4 : 23.500 - 23.521 mm (0.9252 - 0.9260 in)
PBIC1645E
Standard: No. 1 : 0.045 - 0.086 mm (0.0018 - 0.0034 in)
No. 2, 3, 4 : 0.035 - 0.076 mm (0.0014 - 0.0030 in)
Limit : 0.15 mm (0.0059 in)

EM-88
[VQ35DE]
CAMSHAFT
Revision: 2006 December 2006 FX35/FX45
Valve Lifter Clearance
VALVE LIFTER OUTER DIAMETER

Measure the outer diameter at 1/2 height of valve lifter with a
micrometer since valve lifter is in barrel shape.
VALVE LIFTER HOLE DIAMETER

Measure the inner diameter of valve lifter hole of cylinder head
with an inside micrometer.
VALVE LIFTER CLEARANCE

(Valve lifter clearance) = (Valve lifter hole diameter) – (Valve lifter outer diameter)

If the calculated value is out of the standard, referring to each standard of valve lifter outer diameter and
valve lifter hole diameter, replace either or both valve lifter and cylinder head.
INSTALLATION
1. Install timing chain tensioners (secondary) on both sides of cyl-
inder head.

Install timing chain tensioner with its stopper pin attached.

Install timing chain tensioner with sliding part facing down-
ward on right-side cylinder head, and with sliding part facing
upward on left-side cylinder head.

Install new O-ring as shown in the figure.
2. Install valve lifter.

Install it in the original position.
3. Install camshafts. Standard (Intake and exhaust)
: 33.977 - 33.987 mm (1.3377 - 1.3381 in)
JEM798G
Standard (Intake and exhaust): 34.000 - 34.016 mm (1.3386 - 1.3392 in)
SEM867E
Standard (Intake and exhaust): 0.013 - 0.039 mm (0.0005 - 0.0015 in)
PBIC2111E