2005 INFINITI QX4 engine

CAMSHAFT
EM-53
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Revision: October 20052005 QX56

Measure valve clearances using suitable tool.
CAUTION:
If the inspection was carried out with a cold engine, make sure the values with a fully warmed
up engine are still within specifications.
7. Turn the crankshaft pulley clockwise by 270° from the position of No. 1 cylinder compression TDC to
obtain No. 3 cylinder compression TDC.
8. Measure valve clearances at the locations marked “×” as shown
in the table below (locations indicated with white arrow).

No. 3 cylinder compression TDC
9. Turn the crankshaft pulley clockwise 90° from the position of No.
3 cylinder compression TDC (clockwise by 360° from the posi-
tion of No. 1 cylinder compression TDC) to measure the intake
and exhaust valve clearances of No. 6 cylinder and exhaust
valve clearance of No. 2 cylinder.
10. If out of specifications, adjust as necessary, Refer to EM-53, "
ADJUSTMENT" :
ADJUSTMENT
NOTE:

Perform adjustment depending on the selected head thickness of the valve lifter.Valve clearance standard:
Hot*
Intake : 0.304 - 0.416 mm (0.012 - 0.016 in)
Exhaust : 0.308 - 0.432 mm (0.012 - 0.017 in)
Cold
Intake : 0.26 - 0.34 mm (0.010 - 0.013 in)
Exhaust : 0.29 - 0.37 mm (0.011 - 0.015 in)
* : Approximately 80°C (176°F)
KBIA0185E
Measuring position (RH bank) No. 2 CYL No. 4 CYL No. 6 CYL No. 8 CYL
No. 3 cylinder at TDC EXH ×
INT ×
Measuring position (LH bank) No. 1 CYL No. 3 CYL No. 5 CYL No. 7 CYL
No. 3 cylinder at TDCINT××
EXH××
KBIA2526E
KBIA2548E

EM-54Revision: October 2005
CAMSHAFT
2005 QX56

The specified valve lifter thickness is the dimension at normal temperatures. Ignore dimensional differ-
ences caused by temperature. Use the specifications for hot engine condition to adjust.
1. Remove the camshaft. Refer to EM-43, "
Removal and Installation" .
2. Remove the valve lifters at the locations that are out of specification.
3. Measure the center thickness of the removed valve lifters using
suitable tool.
4. Use the equation below to calculate the valve lifter thickness for replacement.

Valve lifter thickness calculation:
Thickness of replacement valve lifter = t1+ (C1 - C2)
t1 = Thickness of removed valve lifter
C1 = Measured valve clearance
C2= Standard valve clearance:

Thickness of a new valve lifter can be identified by stamp
marks on the reverse side (inside the cylinder).
Stamp mark N788 indicates 7.88 mm (0.3102 in) in thickness.

Available thickness of valve lifter: 25 sizes with range 7.88 to
8.36 mm (0.3102 to 0.3291 in) in steps of 0.02 mm (0.0008 in)
(when manufactured at factory). Refer to EM-101, "
Available
Valve Lifter" .
5. Install the selected valve lifter.
6. Install the camshaft.
7. Manually turn the crankshaft pulley a few turns.
8. Make sure the valve clearances for cold engine are within specifications by referring to the specified val-
ues.
9. After completing the repair, check the valve clearances again with the specifications for a warmed engine.
Make sure the values are within specifications.
KBIA0057E
Intake : 0.36 mm (0.0142 in)*
Exhaust : 0.37 mm (0.0146 in)*
*: Approximately 80°C (176°F)
KBIA0 119 E
Valve clearance standard:
Hot*
Intake : 0.304 - 0.416 mm (0.012 - 0.016 in)
Exhaust : 0.308 - 0.432 mm (0.012 - 0.017 in)
Cold
Intake : 0.26 - 0.34 mm (0.010 - 0.013 in)
Exhaust : 0.29 - 0.37 mm (0.011 - 0.015 in)
* : Approximately 80°C (176°F)

OIL SEAL
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Revision: October 20052005 QX56
OIL SEALPFP:00100
Removal and Installation of Valve Oil SealEBS00LMB
REMOVAL
1. Remove the camshaft relating to the valve oil seal to be removed. Refer to EM-43, "REMOVAL" .
2. Remove the valve lifters. Refer to EM-43, "
REMOVAL" .

Correctly identify the location where each part is removed from. Keep parts organized to avoid mixing
them up.
3. Turn the crankshaft until the cylinder requiring new oil seals is at TDC. This will prevent the valve from
dropping into the cylinder.
4. Remove the valve collet using Tool.
CAUTION:
Do not damage the valve lifter holes.
5. Remove the valve spring retainer and valve spring.
CAUTION:
Do not remove the valve spring seat from the valve spring.
6. Remove the valve oil seal using Tool.
INSTALLATION
Installation is in the reverse order of removal.

Install the valve oil seal using Tool.

Apply new engine oil on the new valve oil seal joint and seal lip.

Install the valve oil seal to the specified height "H".Tool number : KV10116200 (J-26336-B)
: KV10115900 (J-26336-20)
: KV10109220 ( — )
WBIA0578E
Tool number : KV10107902 (J-38959)
WBIA0478E
Tool number : KV10115600 (J-38958)
Height "H" (Without valve spring seat installed)
Intake and exhaust : 14.3 - 14.9 mm (0.563 - 0.587 in)
WBIA0490E

EM-56Revision: October 2005
OIL SEAL
2005 QX56
Removal and Installation of Front Oil SealEBS00LMC
REMOVAL
1. Remove the radiator. Refer to CO-12, "Removal and Installation" .
2. Remove cooling fan. Refer to CO-15, "
Removal and Installation (Crankshaft Driven Type)" .
3. Remove the crankshaft pulley. Refer to EM-35, "
TIMING CHAIN" .
4. Remove the front oil seal using suitable tool.
CAUTION:
Do not damage front cover and oil pump drive spacer.
INSTALLATION
1. Apply new engine oil to both the oil seal lip and dust seal lip of the new front oil seal.
2. Install the front oil seal.

Install the front oil seal so that each seal lip is oriented as
shown.

Press-fit until the height of the front oil seal is level with the
mounting surface using suitable tool.
CAUTION:

Do not damage front timing chain case and crankshaft.

Press-fit straight and avoid causing burrs or tilting oil
seal.
3. Installation of the remaining components is in the reverse order of removal.
Removal and Installation of Rear Oil SealEBS00LMD
REMOVAL
1. Remove the transmission assembly. Refer to AT-244, "Removal and Installation (4x2)" or AT-247,
"Removal and Installation (4x4)" .
a. Remove the drive plate.

Holding the crankshaft pulley bolt, lock the crankshaft and remove the drive plate bolts.

Remove the bolts diagonally.
CAUTION:

Do not damage the drive plate. Especially, avoid deforming and damaging the signal plate
teeth (circumference position).

Place the drive plate with the signal plate surface facing other than downward.
SBIA0359E
SEM 71 5A
PBIC2931E

OIL SEAL
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Revision: October 20052005 QX56

Keep magnetic materials away from signal plate.
b. Remove the engine rear plate.
2. Remove the rear oil seal using suitable tool.
CAUTION:
Do not damage crankshaft or oil seal retainer surface.
INSTALLATION
1. Apply new engine oil to both the oil seal lip and dust seal lip of the new rear oil seal.
2. Install the rear oil seal.

Install the rear oil seal so that each seal lip is oriented as
shown.

Press-fit the rear oil seal using suitable tool.
CAUTION:

Do not damage the crankshaft or cylinder block.

Press-fit the oil seal straight to avoid causing burrs or
tilting.

Do not touch grease applied onto the oil seal lip.

Do not damage or scratch the outer circumference of
the rear oil seal.

Tap until flattened with the front edge of the oil seal retainer.
3. Installation of the remaining components is in the reverse order of removal.
WBIA0437E
SEM 71 5A
WBIA0438E

EM-58Revision: October 2005
CYLINDER HEAD
2005 QX56
CYLINDER HEADPFP:11041
On-Vehicle ServiceEBS00LME
CHECKING COMPRESSION PRESSURE
1. Warm up the engine thoroughly. Then stop the engine.
2. Release the fuel pressure. Refer to EC-93, "
FUEL PRESSURE RELEASE" .
CAUTION:
Leave the fuel pump fuse disconnected until step 7.
3. Remove the spark plug from each cylinder. Refer to EM-27, "
REMOVAL" .
4. Connect the engine tachometer (not required in use of CONSULT-II).
5. Install the compression tester with Tool into the spark plug hole.
6. With the accelerator pedal fully depressed, turn the ignition
switch to “START” for cranking. When the gauge pointer stabi-
lizes, read the compression pressure and engine rpm. Perform
these steps to check each cylinder.
Unit: kPa (kg/cm2 , psi) /rpm
CAUTION:
Always use a fully charged battery to obtain specified engine speed.

If the engine speed is out of the specified range, check the battery liquid for proper gravity. Check the
engine speed again with normal battery gravity.

If the compression pressure is below the minimum value, check the valve clearances and parts associ-
ated with the combustion chamber (valve, valve seat, piston, piston ring, cylinder bore, cylinder head,
cylinder head gasket). After checking, measure the compression pressure again.

If some cylinders have low compression pressure, pour a 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, the piston rings may be worn out or damaged. Check
the piston rings and replace if necessary.
–If the compression pressure remains at a low level despite the addition of engine oil, the valves may be
malfunctioning. Check the valves for damage. Replace the 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, the gaskets may be leaking, or a valve in adjacent cylinders
may be damaged. Inspect and repair as required.
7. Install the components in the reverse order of removal.
8. Start the engine and confirm that it runs smoothly.
9. Perform trouble diagnosis. If DTC appears, erase it. Refer to EC-95, "
TROUBLE DIAGNOSIS" . Tool number : EG15050500 (J-45402)
Standard MinimumDeference limit
between cylinders
1,520 (15.5, 220) / 200 1,324 (13.5, 192) / 200 98 (1.0, 14) / 200
WBIA0605E

CYLINDER HEAD
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Revision: October 20052005 QX56
Removal and InstallationEBS00LMF
REMOVAL
1. Remove the engine assembly from the vehicle. Refer to EM-69, "REMOVAL" .
2. Remove the following components and related parts:

Auto tensioner of drive belts and idler pulley. Refer to EM-12, "DRIVE BELTS" .

Thermostat housing and hose. Refer to CO-19, "Removal of Thermostat Housing, Water Outlet and
Heater Pipe" .

Oil pan and oil strainer. Refer to EM-22, "OIL PAN AND OIL STRAINER" .

Fuel tube and fuel injector assembly. Refer to EM-29, "FUEL INJECTOR AND FUEL TUBE" .

Intake manifold. Refer to EM-15, "INTAKE MANIFOLD" .

Ignition coil. Refer to EM-26, "IGNITION COIL" .

Rocker cover. Refer to EM-33, "ROCKER COVER" .
3. Remove the crankshaft pulley, front cover, oil pump, and timing chain. Refer to EM-35, "
TIMING CHAIN" .
4. Remove the camshaft sprockets and camshafts. Refer to EM-43, "
CAMSHAFT" .
5. Remove the cylinder head bolts in reverse of order shown.
1. Harness bracket 2. Engine coolant temperature sensor 3. Washer
4. Cylinder head gasket (left bank) 5. Cylinder head (right bank) 6. Cylinder head bolt
7. Cylinder head gasket (right bank) 8. Cylinder head (left bank)
KBIA2528E
PBIC0068E

EM-60Revision: October 2005
CYLINDER HEAD
2005 QX56
INSPECTION AFTER REMOVAL
Cylinder Head Bolts Diameter

Cylinder head bolts are tightened by plastic zone tightening
method. Whenever the size difference between d1 and d2
exceeds the limit, replace the bolt with a new one.

If reduction of diameter appears in a position other than d2, use
it as d2 point.
INSTALLATION
1. Install a new cylinder head gasket.
2. Install the cylinder head. Follow the steps below to tighten the
bolts in the numerical order shown.
CAUTION:

If cylinder head bolts are re-used, check their diameters
before installation. Refer to EM-60, "
Cylinder Head Bolts
Diameter" .
a. Apply engine oil to threads and seating surface of the bolts.
b. Measure the tightening angle using Tool.
CAUTION:
Measure the tightening angle using Tool. Do not measure
visually.
3. Installation of the remaining components is in the reverse order of removal.Limit (d1 - d2) : 0.18 mm (0.0071 in)
KBIA0189E
Step a : 98.1 N·m (10 kg-m, 72 ft-lb)
Step b :Loosen in the reverse order of tightening.
Step c : 44.1 N·m (4.5 kg-m, 33 ft-lb)
PBIC0068E
Tool number : KV10112100 (BT-8653-A)
Step d : 60° clockwise
Step e : 60° clockwise
WBIA0603E