check oil INFINITI QX4 2005 Factory Service Manual

FUEL INJECTOR AND FUEL TUBE
EM-31
C
D
E
F
G
H
I
J
K
L
MA
EM
Revision: October 20052005 QX56

Handle O-ring with bare hands. Never wear gloves.

Lubricate new O-ring with new engine oil.

Do not clean O-ring with solvent.

Make sure that O-ring and its mating part are free of foreign material.

When installing O-ring, be careful not to scratch it with tool or fingernails. Also be careful not to
twist or stretch O-ring. If O-ring was stretched while it was being attached, do not insert it
quickly into fuel tube.

Insert O-ring straight into fuel tube. Do not angle or twist it.
3. Install the fuel injector to the fuel tube using the following steps.
a. Insert new clip into clip mounting groove on the fuel injector.

Insert clip so that lug “A” of fuel injector matches notch “A” of
the clip.
CAUTION:

Do not reuse clip. Replace it with a new one.

Do not allow the clip to interfere with the O-ring. If
interference occurs, replace the O-ring.
b. Insert the fuel injector into the fuel tube with the clip attached.

Insert it while matching it to the axial center.

Insert fuel injector so that lug “B” of fuel tube matches notch
“B” of the clip.

Make sure that the fuel tube flange is securely fixed in the
flange fixing groove on the clip.
c. Make sure that installation is complete by checking that the fuel
injector does not rotate or come off.

Make sure that the protrusions of the fuel injectors are aligned
with the cutouts of the clips after installation.
4. Install the fuel tube and fuel injector assembly to the intake manifold.
CAUTION:
Do not let the tip of the injector nozzle come in contact with other parts.

Tighten fuel tube assembly bolts “a” to “b” in illustration in two
steps.
5. Install the fuel hose assembly.

Insert connectors straight, making sure that the axis is lined up with fuel tube side to prevent O-ring
from being damaged.

Tighten bolts evenly in several steps.

Make sure that there is no gap between the flange and fuel tube after tightening the bolts.
CAUTION:

Handle O-ring with bare hands. Do not wear gloves.Fuel tube side : Blue
Nozzle side : Brown
KBIA2507E
1st step : 12.8 N·m (1.3 kg-m, 9 ft-lb)
2nd step : 24.5 N·m (2.5 kg-m, 18 ft-lb)
KBIA2474E

EM-32Revision: October 2005
FUEL INJECTOR AND FUEL TUBE
2005 QX56

Lubricate O-ring with new engine oil.

Do not clean O-ring with solvent.

Make sure that O-ring and its mating part are free of foreign material.

When installing O-ring, be careful not to scratch it with tool or fingernails. Also be careful not to
twist or stretch O-ring. If O-ring was stretched while it was being attached, do not insert it
quickly into fuel tube.

Insert new O-ring straight into fuel tube. Do not twist it.
6. Installation of the remaining components is in the reverse order of removal.
INSPECTION AFTER INSTALLATION
After installing the fuel tubes, make sure there are no fuel leaks at the connections using the following steps.
1. Apply fuel pressure to the fuel lines by turning ignition switch ON (with engine stopped). Then check for
fuel leaks at the connections.
NOTE:
Use mirrors for checking on hidden points.
2. Start the engine and rev it up and check for fuel leaks at the connections.
CAUTION:
Do not touch the engine immediately after stopping, as engine becomes extremely hot.

EM-38Revision: October 2005
TIMING CHAIN
2005 QX56
9. Remove the oil pump. Refer to LU-13, "Removal and Installation" .
10. Remove the chain tensioner on the left bank using the following steps.
NOTE:
To remove the timing chain and associated parts, start with those on the left bank. The procedure for
removing parts on the right bank is omitted because it is the same as that for the left bank.
a. Squeeze the return-proof clip ends using suitable tool and push
the plunger into the tensioner body.
b. Secure the plunger using stopper pin.

Stopper pin is made from hard wire approximately 1 mm (0.04
in) in diameter.
c. Remove the bolts and chain tensioner.
WAR NIN G:
Plunger, spring, and spring seat pop out when (squeezing)
return-proof clip without holding plunger head. It may
cause serious injuries. Always hold plunger head when
removing.
NOTE:

Stop the plunger in the fully extended position by using the
return-proof clip 1 if the stopper pin is removed.

Push the plunger 2 into the tensioner body while squeezing
the return-proof clip 1. Secure it using stopper pin 3.
11. Remove the chain tension guide and slack guide.
12. Remove the timing chain and crankshaft sprocket.
13. Loosen the camshaft sprocket bolts as shown and remove the
camshaft sprocket.
CAUTION:
To avoid interference between valves and pistons, do not
turn crankshaft or camshaft when timing chain is discon-
nected.
14. Repeat the same procedure to remove the right timing chain and
associated parts.
INSPECTION AFTER REMOVAL
Check for cracks and any excessive wear at link plates. Replace
chain if necessary.

In the same way as for the left bank, inspect the timing chain
and associated parts on the right bank.
KBIA2479E
KBIA2483E
KBIA2513E
PBIC0282E

EM-40Revision: October 2005
TIMING CHAIN
2005 QX56
3. Install the crankshaft sprockets for both banks.

Install each crankshaft sprocket so that its flange side (the
larger diameter side without teeth) faces in the direction
shown.
NOTE:
The same parts are used but facing directions are different.
4. Install the timing chains and associated parts.

Align the mating mark on each sprocket and the timing chain for installation.
CAUTION:

Before installing chain tensioner, it is possible to change the position of mating mark on tim-
ing chain and each sprocket. After the mating marks are aligned, keep them aligned by hold-
ing them by hand.

Install the slack guides and tension guides onto the correct side by checking the identification mark on
the surface.

Install the chain tensioner with the plunger locked in with the stopper pin.
CAUTION:

Before and after the installation of the chain tensioner, make sure that the mating mark on the
timing chain is not out of alignment.

After installing the chain tensioner, remove the stopper pin to release the tensioner. Make
sure the tensioner is released.

To avoid chain-link skipping of the timing chain, do not move crankshaft or camshafts until
the front cover is installed.
5. In the same way as for the right bank, install the timing chain and associated parts on the left side.
6. Install the oil pump.
7. Install the oil pump drive spacer as follows:

Install so that the front mark on the front edge of the oil pump
drive spacer faces the front of the engine.

Insert the oil pump drive spacer according to the directions of
the crankshaft key and the two flat surfaces of the oil pump
inner rotor.

If the positional relationship does not allow the insertion,
rotate the oil pump inner rotor to allow the oil pump drive
spacer to be inserted.
8. Install the front oil seal using suitable tool.
CAUTION:
Do not scratch or make burrs on the circumference of the
oil seal.
KBIA2515E
KBIA2490E
PBIC0059E

TIMING CHAIN
EM-41
C
D
E
F
G
H
I
J
K
L
MA
EM
Revision: October 20052005 QX56
9. Install the chain tensioner cover.

Apply liquid gasket as shown.
Use Genuine RTV Silicone Sealant or equivalent. Refer to
GI-45, "
Recommended Chemical Products and Sealants"
.
10. Install the front cover as follows:
a. Install a new O-ring on the cylinder block.
b. Apply liquid gasket as shown.
Use Genuine RTV Silicone Sealant or equivalent. Refer to
GI-45, "
Recommended Chemical Products and Sealants".
c. Check again that the timing mating marks on the timing chain
and on each sprocket are aligned. Then install the front cover.
d. Install the bolts in the numerical order shown.
e. After tightening, re-tighten to the specified torque.
CAUTION:
Be sure to wipe off any excessive liquid gasket leaking onto
surface mating with oil pan.
11. Install the chain case cover (right bank) and (left bank) as fol-
lows:
a. Apply liquid gasket as shown.
Use Genuine RTV Silicone Sealant or equivalent. Refer to
GI-45, "
Recommended Chemical Products and Sealants".
CAUTION:
The start and end of the application of the liquid gasket
should be crossed at a position that cannot be seen after
attaching the chain case cover.
KBIA2547E
KBIA2516E
KBIA2517E
M6 × 50 mm (1.97 in) : No. 1, 20, 25, 26, 27
M6 × 80 mm (3.15 in) : No. 4, 5, 7
M6 × 20 mm (0.79 in) : Except the above
KBIA2478E
KBIA2481E

EM-42Revision: October 2005
TIMING CHAIN
2005 QX56
b. Install the bolts in the numerical order shown.
12. Install the crankshaft pulley.

Install the key of the crankshaft.

Insert the pulley by lightly tapping it.
CAUTION:
Do not tap pulley on the side surface where the belt is installed (outer circumference).
13. Tighten the crankshaft pulley bolt.

Lock the crankshaft using suitable tool, then tighten the bolt.

Perform the following steps for angular tightening:
a. Apply engine oil onto the threaded parts of the bolt and seating area.
b. Select the one most visible notch of the four on the bolt flange.
Corresponding to the selected notch, put a mating mark (such
as paint) on the crankshaft pulley.
14. Rotate the crankshaft pulley in normal direction (clockwise when
viewed from engine front) to check for parts interference.
15. Installation of the remaining components is in the reverse order
of removal.
WBIA0468E
Crankshaft pulley bolt torque
Step 1 : 93.1 N·m (9.5 kg-m, 69 ft-lb)
Step 2 : additional 90° (angle tightening)
KBIA2519E

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

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

CYLINDER HEAD
EM-67
C
D
E
F
G
H
I
J
K
L
MA
EM
Revision: October 20052005 QX56
VALVE SEAT CONTACT

After confirming that the dimensions of the valve guides and
valves are within specifications, perform this procedure.

Apply prussian blue (or white lead) onto the contacting surface
of the valve seat to check the condition of the valve contact on
the surface.

Check if the contact area band is continuous all around the cir-
cumference.

If not, grind to adjust the valve fit and check again. If the contact-
ing surface still has NG conditions even after the re-check,
replace the valve seat.
VALVE SEAT REPLACEMENT
When the valve seat is removed, replace it with oversized (0.5 mm, 0.020 in) valve seat.
1. Bore out the old seat until it collapses. Boring should not continue beyond the bottom face of the seat
recess in the cylinder head. Set the machine depth stop to ensure this.
2. Ream the cylinder head recess diameter for service valve seat.

Be sure to ream in circles concentric to the valve guide center.

This will enable valve seat to fit correctly.
3. Heat the cylinder head to 110° to 130°C (230° to 266°F) by
soaking it in heated oil.
4. Cool the valve seats well with dry ice. Force fit the valve seat into the cylinder head.
CAUTION:

Avoid directly touching cold valve seats.

Cylinder head contains heat. When working, wear protective equipment to avoid getting burned.
5. Finish the seat to the specified dimensions using suitable tool.
Refer to EM-103, "
Valve Seat" .
CAUTION:
When using valve seat cutter, firmly grip the cutter handle
with both hands. Then, press on the contacting surface all
around the circumference to cut in a single drive. Improper
pressure on the cutter or cutting many different times may
result in stage valve seat.
SBIA0322E
Oversize [0.5 mm (0.020 in)] (Service):
Intake : 38.500 - 38.516 mm (1.5157 - 1.5164 in)
Exhaust : 32.700 - 32.716 mm (1.2874 - 1.2880 in)
SEM 79 5A
SEM 00 8A
SEM 93 4C

EM-70Revision: October 2005
ENGINE ASSEMBLY
2005 QX56
5. Remove the cowl extension. Refer to EI-18, "Removal and Installation" .
6. Remove the engine room cover using power tools.
7. Remove the air duct and air cleaner case assembly EM-14, "
REMOVAL" .
8. Disconnect the vacuum hose between the vehicle and engine and set it aside.
9. Remove the radiator assembly and hoses. Refer to CO-12, "
REMOVAL" .
10. Remove the drive belts. Refer to EM-12, "
Removal" .
11. Remove the fan blade. Refer to CO-15, "
REMOVAL" .
12. Disconnect the engine room harness from the fuse box and set it aside.
13. Disconnect the ECM.
14. Disconnect the engine room harness from the engine side and set it aside.
15. Disconnect the engine harness grounds.
16. Disconnect the power steering reservoir tank from the engine and move it aside.
17. Disconnect the power steering oil pump from the engine. Move it aside and secure it using suitable wire or
rope. Refer to PS-26, "
REMOVAL" .
18. Remove the A/C compressor bolts and set the compressor aside. Refer to ATC-179, "
REMOVAL" .
19. Disconnect the brake booster vacuum line.
20. Disconnect the EVAP line.
21. Disconnect the fuel hose at the engine side connection. Refer to EM-29, "
REMOVAL" .
22. Disconnect the heater hoses at cowl, and install plugs to avoid leakage of engine coolant.
23. Remove the A/T oil level indicator and indicator tube upper bolts.
24. Remove the front final drive assembly (4x4 only). Refer to FFD-11, "
REMOVAL" .
25. Remove the exhaust manifolds. Refer to EM-19, "
Removal and Installation" .
26. Install the engine slingers into the left bank cylinder head and
right bank cylinder head.
27. Remove the A/T. Refer to AT-244, "
Removal and Installation
(4x2)" or AT-247, "Removal and Installation (4x4)" .
28. Lift using hoist and secure the engine in position.
29. Remove the engine assembly from the vehicle, avoid interfer-
ence with the vehicle body.
CAUTION:

Before and during lifting, always check if any harnesses
are left connected.
30. Remove the parts that may restrict installation of the engine to the engine stand.
NOTE:
This procedure is described assuming that you use an engine stand mounting to the surface to which the
transmission mounts.
a. Remove the drive plate.

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

Loosen the bolts diagonally.
WBIA0464E
Engine slinger torque: 45.0 N·m (4.6 kg-m, 33 ft-lb)
PBIC1556E