INFINITI QX56 2007 Factory Service Manual

EXHAUST MANIFOLD AND THREE WAY CATALYST
EM
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< ON-VE HICLE REPAIR >
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EXHAUST MANIFOLD AND THREE WA Y CATALYST
Exploded ViewINFOID:000 0000004918768
Removal and Installa tionINFOID:000 0000005190289
REMOVAL
WARNING:
Perf
o rm the wo rk when the exhau st and cooling system have co oled sufficiently.
1. Remove the engine undercover (rear) using power tool (4WD models).
2. Remove front final drive assembly (4WD models). Refer to
FFD-12, &#34;Removal and Installation&#34;.
3. Remove the main muffler assembly and center exhaust tube. Refer to EX-3, &#34;Removal and Installation&#34;.
4. Remove the front exhaust tubes. Refer to EX-3, &#34;Removal and Installation&#34;.
5. Remove front tires. Refer to WT-7, &#34;Rotation&#34;.
6. Remove fender protectors. Refer to EI-22, &#34;Removal and Installation&#34;.
7. Remove the LH and RH air fuel ratio A/F sensors.
•Follow steps below to remove each air fuel ratio A/F sensor.
a. Remove the harness connector of each air fuel ratio A/F sensor, and harness from bracket and middle
clamp
.
1.Air fuel ratio A/F sensor 1 (bank 2)2. Exhaust manifold cover (bank 2)3. Exhaust manifold (bank 2)
4. Gaskets5.Exhaust manifold (bank 1)6. Exhaust manifold cover (bank 1)
7. Air fuel ratio A/F sensor 1 (bank 1)A.UpB.Coated face
C. Manifold sideD. Up markFront
AWBIA04 53GB

EM-22
< ON-VEHICLE REPA IR >
EXHAUST MANIFOLD AND THREE WAY CATALYST
b. Remove the air fuel ratio A /F sensors from both LH and RH
exhaust
manifolds using T ool.
CAUTIO
N:
•Do not damage the air fuel ratio A/F sensors
•D iscard any air fuel ratio A /F sensor which h as been
dr
opped from a heig ht of more than 0.5m ( 19.7 in) onto a
h ard surface such as a c on crete floor. Re place it with a
new one.
8. Support the engine using a suitable t ool.
9. Remove the exhaust manifold (LH) (A) following the steps
belo
w.
•: Front
•B: Exhaust manifold (RH)
a. Remove the engine mounting insulator. Refer to EM-74.
b. Remove the exhaust manif old cover.
c. Remove the engine mounting bracket. Refer to EM-74.
d. Loosen the nuts in reverse order as shown using power tool.
e. Remove the exhaust manifold (LH) (A).
10
. Remove the exhaust manifold (RH) (B) following the steps
belo
w.
•: Front
•A: Exhaust manifold (LH)
a. Remove the engine mounting insulator. Refer to EM-74.
b. Remove the exhaust manif old c over.
c. Remove the engine mounting bracket. Refer to EM-74.
d. Remove the oil level gauge guide. Refer to EM-24.
e. Loosen the nuts in reverse order as shown using power tool.
f. Remove the ex hau st manif old (RH) (B).
INSP ECTION AFTER REMOVAL
Surface Distortion
•C heck the flatness of each exhaust manifold flange surface using
sui
t able tools.
•If measurement exc eeds the limi t, replace the exhaust manifold.
INST ALLA TION
Installation is in the reverse order of removal.
To ol number: — (J-4 4626)
WBIA 0630E
AW BIA0814ZZ
AW BIA0814ZZ
Fl atness limit: 0.3 mm (0. 012 in)
KBIA 2504E

EXHAUST MANIFOLD AND THREE WAY CATALYST
EM-23
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• Install new exhaust manifold gasket with the top of the triangular
up mark on it facing up and its coated face (gray side) toward the
exhaust manifold side.
• Tighten the exhaust manifold nuts LH and RH in the numerical order shown. Then recheck the torque of the nuts.
- A: Exhaust manifold (LH)
- B: Exhaust manifold (RH)
- : Front
• Before installing new air fuel ratio A/F sensors, clean the exhaust system threads using suitable tool and
apply anti-seize lubricant.
CAUTION:
• Do not over tighten the air fuel ratio A/F sen sors. Doing so may cause damage to the sensor,
resulting in the MIL coming on.
KBIA2553E
AWBIA0814ZZ
Oxygen sensor thread cleaner : (J-43879-12)
Oxygen sensor thread cleaner : (J-43897-18)

EM-24
< SERVICE INFORMATION >
OIL PAN AND OIL STRAINER
OIL PAN AND OIL STRAINER
Removal and InstallationINFOID:0000000003531528
REMOVAL
WARNING:
To avoid the danger of being scalded, never drain the engine oil when the engine is hot.
1. Remove the engine. Refer to EM-74, "
Removal and Installation".
2. Remove the oil pan (lower) using the following steps.
a. Remove the oil pan (lower) bolts using power tool.
1. Oil pan (upper) 2. O-ring 3. O-ring
4. O-ring 5. O-ring (with collar) 6. Oil level gauge guide
7. Oil level gauge 8. O-ring 9. Connector bolt
10. Oil filter 11. Oil cooler 12. Relief valve
13. Oil pressure switch 14. Gasket 15. Drain plug
16. Oil pan (lower) 17. Oil strainer
KBIA2465E
KBIA2466E

OIL PAN AND OIL STRAINEREM-25
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b. Insert Tool between the lower oil pan and the upper oil pan.
CAUTION:
• Be careful not to damage the mating surface.
• Do not insert a screwdriver, this will damage the matingsurfaces.
c. Slide (1) the Tool by tapping (2) its side with a hammer to remove the lower oil pan from the upper oil pan.
3. Remove the oil strainer from the oil pan (upper).
4. Remove the oil pan (upper) using the following steps.
a. Remove the oil pan (upper) bolts a shown.
b. Remove the oil pan (upper) from the cylinder block by prying it at the points shown, using suitable tool.
CAUTION:
Do not damage mating surface.
5. Remove the O-rings from the oil pump and front cover. NOTE:
Do not reuse O-rings.
INSPECTION AFTER REMOVAL
Clean the oil strainer.
INSTALLATION
Tool number : KV10111100 (J-37228)
WBIA0566E
KBIA2467E
KBIA2468E
KBIA2469E

EM-26
< SERVICE INFORMATION >
OIL PAN AND OIL STRAINER
1. Install the oil pan (upper) using the following steps.
a. Apply liquid gasket thoroughly as shown.Use Genuine RTV Silicone Sealant or equivalent. Refer to GI-
45, "Recommended Chemical Product and Sealant".
CAUTION:
Apply liquid gasket to outside of bolt hole for the hole
shown by .
b. Install new O-rings to the oil pump and front cover side.
c. Tighten the bolts in numerical order as shown.
2. Install the oil strainer to the oil pan (upper).
3. Install the oil pan (lower).
a. Apply liquid gasket thoroughly as shown. Use Genuine RTV Silicone Seal ant or equivalent. Refer to
GI-45, "
Recommended Chemical Product and Sealant"
b. Tighten the oil pan (lower) bolts in numerical order as shown.
KBIA2470E
KBIA2469E
M6 × 30 mm (1.18 in) : No. 15, 16
M8 × 25 mm (0.98in) : No. 1, 3, 5, 7, 11, 13
M8 × 45 mm (1.77 in) : No. 2, 4, 6, 8, 10, 14
M8 × 123 mm (4.84in) : No. 9, 12
PBIC2553E
KBIA2471E
PBIC2595E

OIL PAN AND OIL STRAINEREM-27
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4. Install the oil pan drain plug.
5. Install engine assembly. Refer to
EM-74, "
Removal and Installation".
• Do not fill the engine oil for at least 30 minutes after oil pan is installed.
INSPECTION AFTER INSTALLATION
1. Check engine oil level and add engine oil if necessary. Refer to LU-8, "Inspection".
2. Start the engine, and check for leaks of engine oil.
3. Stop engine and wait for 10 minutes.
4. Check engine oil level again.

EM-28
< SERVICE INFORMATION >
IGNITION COIL
IGNITION COIL
Removal and InstallationINFOID:0000000003531529
REMOVAL
1. Remove the engine room cover using power tool. Refer to EM-12, "Removal and Installation".
2. Disconnect the harness connector from the ignition coil.
3. Remove the ignition coil. CAUTION:
Do not shock ig nition coil.
INSTALLATION
Installation is in the reverse order of removal.
1. Ignition coil 2. Spark plug
WBIA0796E

SPARK PLUGEM-29
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SPARK PLUG
Removal and InstallationINFOID:0000000003531530
REMOVAL
1. Remove the ignition coil. Refer to
EM-28, "Removal and Installation".
2. Remove the spark plug using suitable tool.
INSPECTION AFTER REMOVAL
• Do not use a wire brush for cleaning.
• If the spark plug tip is covered with carbon, a spark plug cleaner may be used.
1. Ignition coil 2. Spark plug
WBIA0796E
SEM294A
SMA773C
Cleaner air pressure : Less than 588 kPa (5.9 bar, 6 kg/cm2, 85 psi)
Cleaning time : Less than 20 seconds

EM-30
< SERVICE INFORMATION >
SPARK PLUG
• Checking and adjusting plug gap is not required between changeintervals.
INSTALLATION
Installation is in the reverse order of removal.
CAUTION:
Do not drop or shock spark plug.
SMA806CA
Make NGK
Standard type DIFR5A-11
Gap (Nominal) : 1.1 mm (0.043 in)