ESP INFINITI QX56 2004 Factory Manual Online

EI-30
SIDE GUARD MOLDING
Revision: August 20072004 QX56
2. Heat the panel and double-faced adhesive tape surface to 30° to 40°C (86° to 104°F).
3. Remove the backing sheet from the double-faced adhesive tape surface.

Align the plastic clips into the holes in the outer door.

Continue aligning the plastic clips into their corresponding holes in the outer door during installation.
4. Press ends by hand and use a roller to apply 5 kg-f (11 lbs-f) to press double-faced adhesive tape surface
on side guard molding to door surface.

Apply even pressure along double-faced adhesive tape surface on side guard molding to insure proper
wet out.
CAUTION:
To secure contact of double-faced adhesive tape, do not wash vehicle for 24 hours after installation.

TIMING CHAIN
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INSPECTION AFTER REMOVAL
Check for cracks and any excessive wear at link plates. Replace
chain if necessary.

In the same way as for left bank, inspect timing chain and asso-
ciated parts on right bank.
INSTALLATION
NOTE:

The above figure shows the relationship between the mating mark on each timing chain and that of the
corresponding sprocket, with the components installed.

To install timing chain and associated parts, start with those on the right bank. The procedure for installing
parts on the left bank is omitted because it is the same as that for installation on the right bank.
1. Make sure the crankshaft key and dowel pin of each camshaft
are facing in the direction as shown.
PBIC0282E
KBIA2514E
SBIA0356E

OIL SEAL
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Removal and Installation of Front Oil SealEBS00ILQ
REMOVAL
1. Remove the engine. Refer to EM-70, "REMOVAL" .
2. Remove crankshaft pulley. Refer to EM-35, "
TIMING CHAIN" .
3. Remove the front oil seal using a suitable tool.
CAUTION:
Be careful not to damage front cover and oil pump drive
spacer.
INSTALLATION
1. Apply new engine oil to both oil seal lip and dust seal lip of new front oil seal.
2. Install front oil seal.

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

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

Be careful not to 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 SealEBS00ILR
REMOVAL
1. Remove transmission assembly. Refer to AT-255, "REMOVAL" (4x2 models) or AT-258, "REMOVAL"
(4x4 models).
a. Remove drive plate.

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

Remove the bolts diagonally.
CAUTION:

Be careful not to damage drive plate. Especially avoid deforming and damaging of signal
plate teeth (circumference position).

Place the drive plate with signal plate surface facing other than downward.

Keep magnetic materials away from signal plate.
SBIA0359E
SEM 71 5A
PBIC2931E

CYLINDER HEAD
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CYLINDER HEADPFP:11041
On-Vehicle ServiceEBS00ILS
CHECKING COMPRESSION PRESSURE
1. Warm up engine thoroughly. Then stop engine.
2. Release fuel pressure. Refer to EC-46, "
FUEL PRESSURE RELEASE" .
a. Remove fuel pump fuse, and start engine.
Refer to PG-78, "
FUSE AND RELAY BOX" or fuel pump fuse location.

Let fuel pump fuse removed until the end of step 7.
b. After engine stalls, crank it two or three times to release all fuel pressure.
3. Remove ignition coil and spark plug from each cylinder.
Refer to EM-27, "
REMOVAL" .
4. Connect engine tachometer (not required in use of CONSULT-II).
5. Install compression tester with Tool into spark plug hole.
6. With accelerator pedal fully depressed, turn ignition switch to “START” for cranking. When the gauge
pointer stabilizes, read the compression pressure and engine rpm. Perform these steps to check each cyl-
inder.
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 specified range, check battery liquid for proper gravity. Check engine
speed again with normal battery gravity.

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

If some cylinders have low compression pressure, pour 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 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 valve in adjacent cylinders may
be damaged. Inspect and repair as required.
7. After inspection is complete, install removed parts. Installation is in the reverse order of removal.
8. Start engine, and confirm that engine runs smoothly.
9. Perform trouble diagnosis. If DTC appears, erase it. Refer to EC-71, "
TROUBLE DIAGNOSIS" . Tool number : EG15050500 (J-45402)
WBIA0605E
Standard MinimumDeference limit
between cylinders
1,520 (15.5, 220) / 200 1,324 (13.5, 192) / 200 98 (1.0, 14) / 300

EM-74Revision: August 2007
CYLINDER BLOCK
2004 QX56
* Refer to GI-45, "Recommended Chemical Products and Sealants" .
DISASSEMBLY
1. Remove engine assembly. Refer to EM-70, "REMOVAL" .
2. Remove the drive plate.

Hold the crankshaft pulley bolt to lock the crankshaft and remove the drive plate bolts.

Loosen bolts diagonally.
CAUTION:

Be careful not to damage drive plate. Especially avoid
deforming and damaging of signal plate teeth (circum-
ference position).

Place the drive plate with signal plate surface facing
other than downward.

Keep magnetic materials away from signal plate.
3. Lift the engine with hoist to install it onto engine stand. Refer to EM-70, "
REMOVAL" .
CAUTION:

Use an engine stand that has a load capacity [approximately 240kg (529 lb) or more] large
enough for supporting the engine weight.

Before removing the hanging chains, make sure the engine stand is stable and there is no risk
of overturning.

If the load capacity of the stand is not adequate, remove the following parts beforehand to reduce the
potential risk of overturning the stand.
–Remove fuel tube and fuel injector assembly. Refer to EM-29, "REMOVAL" .
–Remove intake manifold. Refer to EM-15, "REMOVAL" .
–Remove exhaust manifold. Refer to EM-19, "REMOVAL" .
–Remove A/C compressor fitting bolts and brackets. Refer to ATC-166, "REMOVAL" .
–Remove ignition coil. Refer to EM-26, "REMOVAL" .
–Remove rocker cover. Refer to EM-33, "REMOVAL" .
–Other removable brackets.
4. Drain engine oil. Refer to MA-16, "
Changing Engine Oil" .
1. Knock sensor sub-harness 2. Knock sensor 3. Cylinder block
4. Main bearing 5. Top ring 6. Second ring
7. Oil ring 8. Crankshaft key 9. Piston
10. Connecting rod 11. Snap ring 12. Piston pin
13. Connecting rod bearing 14. Connecting rod bearing cap 15. Main bearing cap
16. Thrust bearing 17. Main bearing 18. Crankshaft
19. Pilot converter 20. Thrust bearing 21. Side bolt
22. Drive plate 23. Reinforcement plate 24. Rear oil seal retainer
25. Rear oil seal 26. Transmission 27. O-ring
28. Crankshaft position sensor (POS) 29. Gasket 30. Cylinder block heater
31. Connector cap
KBIA2491E

CYLINDER BLOCK
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5. Drain engine coolant by removing cylinder block drain plug “A”,
“B”, “C” and “D” as shown.
6. Remove the following components and associated parts (The parts listed in step 3 are not included here.)

Oil pan and oil strainer. Refer to EM-22, "REMOVAL" .

Crankshaft pulley, front cover and timing chain. Refer to EM-36, "REMOVAL" .

Camshaft. Refer to EM-43, "REMOVAL" .

Cylinder head. Refer to EM-60, "REMOVAL" .
7. Remove knock sensor.
CAUTION:
Carefully handle the sensor, avoiding shocks.
8. Remove the piston and connecting rod assembly as follows.

Before removing the piston and connecting rod assembly, check the connecting rod side clearance.
Refer to EM-89, "
CONNECTING ROD SIDE CLEARANCE" .
a. Position the crankshaft pin corresponding to the connecting rod to be removed onto the bottom dead cen-
ter.
b. Remove the connecting rod cap.
c. Push the piston and connecting rod assembly out to the cylinder
head side using suitable tool.
9. Remove the connecting rod bearings.
CAUTION:
When removing them, note the installation position. Keep them in the correct order.
10. Remove the piston rings from the piston using suitable tool.
CAUTION:

When removing the piston rings, be careful not to dam-
age the piston.

Be careful not to damage piston rings by expanding them
excessively.

Before removing the piston rings, check the piston ring side
clearance. Refer to EM-90, "
PISTON RING SIDE CLEARANCE"
.
WBIA0419E
PBIC0086E
PBIC0087E

EM-80Revision: August 2007
CYLINDER BLOCK
2004 QX56

Assemble so that the front mark on the piston crown and the
oil holes and the cylinder No. on the connecting rod are posi-
tioned as shown.
c. Install the snap ring to the grooves of the piston front side.

Insert it fully into groove to install.

After installing, make sure the connecting rod moves
smoothly.
11. Install the piston rings.
CAUTION:
Be careful not to damage the piston.

Position each ring with the gap as shown, referring to the pis-
ton front mark.

Install the second ring with the stamped surface facing
upward.
12. Install the connecting rod bearings to the connecting rod and the
connecting rod cap.

When installing the connecting rod bearings, apply engine oil
to the bearing surface (inside). Do not apply oil to the back
surface, but thoroughly clean it.

When installing, align the connecting rod bearing stopper pro-
trusion with the cutout of the connecting rod to install.

Check the oil holes on the connecting rod and those on the
corresponding bearing are aligned.
13. Install the piston and connecting rod assembly to the crankshaft
using Tool.

Position the crankshaft pin corresponding to the connecting
rod to be installed onto the bottom dead center.

Apply engine oil sufficiently to the cylinder bore, piston, and
crankshaft pin.

Match the cylinder position with the cylinder No. on the con-
necting rod to install.

Install the piston with the front mark on the piston crown fac-
ing the front of the engine.
CAUTION:
Be careful not to damage the crankshaft pin, resulting from an interference of the connecting
rod big end.
KBIA2534E
Stamped mark Second ring : 2N
PBIC0100E
PBIC0266E
Tool number : EM03470000 (J-8037)
KBIA2535E

EM-92Revision: August 2007
CYLINDER BLOCK
2004 QX56
Piston Pin Diameter

Measure diameter of piston pin using suitable tool.
Connecting Rod Bushing Oil Clearance (Small End)
(Connecting rod small end oil clearance) = (Inside diameter of con-
necting rod small end) – (Piston pin diameter)

If the measured value exceeds the standard, replace the con-
necting rod assembly and/or piston and piston pin assembly.

If replacing the piston and piston pin assembly, refer to the Table
for Selective Fitting for Piston to select the piston corresponding
to the applicable bore grade of the cylinder block to be used.
Refer to EM-83, "
HOW TO SELECT PISTON" .
Factory installed parts grading:

Only grade 0 is available.
Unit: mm (in)
CYLINDER BLOCK DISTORTION

Remove any oil, scale, gasket, sealant and carbon deposits from the cylinder block surface.
CAUTION:
Do not allow any debris to enter the oil or coolant passages.

Measure the block upper face for distortion in six directions as
shown.

If measurement exceeds the limit, replace the cylinder block.Standard : 21.989 - 21.995 mm (0.8657 - 0.8659 in)
PBIC0 117 E
Standard : 0.005 - 0.017 mm (0.0002 - 0.0007 in)
KBIA2536E
Grade 0
Connecting rod bushing inside diameter22.000 - 22.006
(0.8661 - 0.8664)
Piston pin diameter21.989 - 21.995
(0.8657 - 0.8659)
Piston pin hole diameter21.993 - 21.999
(0.8659 - 0.8661)
KBIA2496E
Standard : 0.03 mm (0.0012 in)
Limit : 0.1 mm (0.004 in)
SEM 12 3C

FUEL LEVEL SENSOR UNIT, FUEL FILTER AND FUEL PUMP ASSEMBLY
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Revision: August 20072004 QX56
Disconnect the quick connector as follows:

Hold the sides of the connector, push in tabs and pull out the
tube.

If the connector and the tube are stuck together, push and pull
several times until they start to move. Then disconnect them
by pulling.
CAUTION:

The quick connector can be disconnected when the tabs
are completely depressed. Do not twist the quick connec-
tor more than necessary.

Do not use any tools to disconnect the quick connector.

Keep the resin tube away from heat. Be especially careful
when welding near the tube.

Prevent any acid liquids such as battery electrolyte, from
getting on the resin tube.

Do not bend or twist the resin tube during connection.

Do not remove the remaining retainer on the hard tube (or
the equivalent) except when the resin tube or the retainer
is replaced.

When the resin tube or hard tube, or the equivalent, is
replaced, also replace the retainer with a new one (white
colored retainer).

To keep the quick connector clean and to avoid damage
and contamination from foreign materials, cover the
quick connector with plastic bags or suitable material as
shown.
SF E5 62 A
PBIC1268E
PBIC0163E

FL-12Revision: August 2007
FUEL TANK
2004 QX56
CAUTION:

The quick connector can be disconnected when the tabs
are completely depressed. Do not twist the quick connec-
tor more than necessary.

Do not use any tools to disconnect the quick connector.

Keep the resin tube away from heat. Be especially careful
when welding near the tube.

Prevent any acid liquids such as battery electrolyte, from
getting on the resin tube.

Do not bend or twist the resin tube during connection.

Do not remove the remaining retainer on the hard tube (or
the equivalent) except when the resin tube or the retainer
is replaced.

When the resin tube or hard tube, or the equivalent, is
replaced, also replace the retainer with a new one (white
colored retainer).

To keep the quick connector clean and to avoid damage
and contamination from foreign materials, cover the
quick connector with plastic bags or suitable material as
shown.
15. Remove the four bolts and remove the fuel tank shield.
16. Remove the propeller shaft. Refer to PR-8, "
REAR PROPELLER SHAFT" .
17. Remove the three clips and remove the fuel tank protector at the
front of the fuel tank as necessary to transfer to the new fuel
tank.
18. Disconnect fuel filler hose, and vent hose at the fuel tank side.
PBIC1268E
PBIC0163E
LBIA0388E