2004 INFINITI QX56 lock

CYLINDER HEAD
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Revision: August 20072004 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 bolts with new one.

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

If cylinder head bolts are re-used, check their diameters
before installation. Refer to EM-61, "
Cylinder Head Bolts
Diameter" .
a. Apply engine oil to threads and seating surface of bolts.
b. Measure tightening angle using Tool.
CAUTION:
Measure tightening angle using Tool. Do not measure visu-
ally.
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 BLOCK
EM-73
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Revision: August 20072004 QX56
CYLINDER BLOCKPFP:11010
Disassembly and AssemblyEBS00ILX
WBIA0471E

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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Revision: August 20072004 QX56
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-76Revision: August 2007
CYLINDER BLOCK
2004 QX56
11. Remove the piston from the connecting rod as follows.
a. Remove the snap ring using suitable tool.
b. Heat piston to 60° to 70°C (140° to 158°F) using suitable tool.
c. Push out the piston pin using suitable tool.
12. Separate and remove the rear oil seal retainer from the cylinder block.
CAUTION:
Be careful not to damage the mating surface.
13. Remove the rear oil seal from the rear oil seal retainer.
14. Remove the main bearing cap as follows:

Before loosening the main bearing cap bolts, measure the
crankshaft side clearance.
Refer to EM-89, "
CRANKSHAFT END PLAY" .

Loosen bolts in several different steps.
a. Loosen the side bolts (M10) starting from 30 to 21 to remove.
b. Loosen the main bearing cap sub bolts (M9) starting from 20 to
11 to remove.
c. Loosen the main bearing cap bolts (M12) starting from 10 to 1 to
remove.
PBIC0260E
PBIC0261E
PBIC0262E
PBIC0090E

CYLINDER BLOCK
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d. Remove the main bearing cap.

Insert bolts (2) into bolt holes, and then remove main bearing
cap by lifting up and shaking forward and backward.
15. Remove the crankshaft.
16. Remove the main bearings and thrust bearings from the cylinder block and main bearing caps.

When removing them, note the installation position. Keep them in the correct order.
17. Remove the pilot converter using Tool if necessary.
ASSEMBLY
1. Fully air-blow the coolant and oil passages in the cylinder block, cylinder bore, and crankcase to remove
any foreign material.
CAUTION:
Use goggles to protect your eyes.
2. Install each plug to the cylinder block (only screw-type plugs are
shown).

Apply liquid gasket.
Use Genuine Thread Sealant or equivalent. Refer to GI-
45, "Recommended Chemical Products and Sealants".

Replace the copper washers with new ones.

Tighten each plug as specified below.
3. Install the main bearings and thrust bearings.
a. Remove dust, dirt, and oil on the bearing mating surfaces of the
cylinder block and main bearing caps.
b. Install the thrust bearings to both sides of the No. 3 journal hous-
ing on the cylinder block and main bearing caps

Install the thrust bearings with the oil groove facing the crank-
shaft arm (outside).

Install the thrust bearings with a protrusion in the center on
the main bearing caps.
KBIA2492E
Tool number : ST16610001 (J-23907)
WBIA0596E
Part Washer Tightening torque
A Yes 53.9 N·m (5.5 kg-m, 40 ft-lb)
B No 19.6 N·m (2.0 kg-m, 15 ft-lb)
C Yes 62.7 N·m (6.4 kg-m, 46 ft-lb)
D Yes 62.7 N·m (6.4 kg-m, 46 ft-lb)
WBIA0419E
PBIC0093E

EM-78Revision: August 2007
CYLINDER BLOCK
2004 QX56
c. Install the main bearings paying attention to the direction.

Install the one with oil holes onto the cylinder block and the
one without oil holes onto the main bearing cap.

Before installing the bearings, apply engine oil to the bearing
surface (inside). Do not apply oil to the back surface, but thor-
oughly clean it.

When installing, align the bearing stopper to the notch.

Ensure the oil holes on cylinder block and those on the corre-
sponding bearing are aligned.
4. Install the pilot converter to the crankshaft using suitable tool.
5. Install the crankshaft to the cylinder block.

While turning the crankshaft by hand, make sure it turns
smoothly.
6. Install the main bearing caps.

Align the identification number to the journal position to install.

Install it with front mark (indicated by the arrow) facing front of
engine.

Tap the caps lightly to seat them on the installation position.
7. Follow the steps below to tighten each main bearing cap bolt.
a. Apply engine oil to threads and seating surfaces of bolts, and
tighten all bolts temporarily.
b. Measure tightening angle using Tool.
CAUTION:
Measure tightening angle using Tool. Do not measure visu-
ally.
PBIC0094E
EMP0569D
KBIA2533E
Main bearing cap bolts
in order of 1 to 10: 39.2 N·m (4.0 kg-m, 29 ft.-lb)
Main bearing cap sub
bolts in order of 11 to 20: 29.4 N·m (3.0 kg-m, 22 ft-lb)
PBIC0090E
Tool number : KV10112100 (BT-8653-A)
Main bearing cap bolts in
order of 1 to 10: 40°
WBIA0597E

CYLINDER BLOCK
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Revision: August 20072004 QX56
Rotate crankshaft by hand after bolts are tightened. Check if it rotates smoothly.

Check the crankshaft side clearance. Refer to EM-89, "CRANKSHAFT END PLAY" .
8. Install rear oil seal to rear oil seal retainer.
CAUTION:
Do not damage or scratch outer circumference of oil seal.

Install new rear oil seal in the direction shown.

Tap until flattened with front edge of rear oil seal retainer
using suitable tool.

Fit the rear oil seal until it is level with the rear end surface of
rear oil seal retainer.
9. Install rear oil seal retainer.

Apply liquid gasket to rear oil seal retainer as shown.
Use Genuine RTV Silicone Sealant or equivalent. Refer to
GI-45, "
Recommended Chemical Products and Sealants".

Apply new engine oil on lips of rear oil seal. Do not touch.
10. Install the piston to the connecting rod.
a. Install the snap ring to the grooves of the piston rear side.

Insert it fully into groove to install.
b. Install the piston to the connecting rod.

Heat the piston until the piston pin can be pushed in by hand without excess force [approx. 60° to 70 C°
(140° to 158 °F)]. From the front to the rear, insert the piston pin into the piston and the connecting rod. Main bearing cap sub
bolts in order of 11 to 20: 30°
Side bolts in order of 21 to
30: 49 N·m (5.0 kg-m, 36 ft-lb)
SEM 71 5A
PBIC0097E
SBIA0391E