INFINITI QX4 2005 Factory Service Manual

EM-78Revision: October 2005
CYLINDER BLOCK
2005 QX56
6. Install main bearing caps.

Align the identification number to the journal position to install.

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

Tap caps lightly to seat them in 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.

Rotate crankshaft by hand after bolts are tightened. Check if it rotates smoothly.

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

Install new rear oil seal in the direction shown.
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°
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)
WBIA0597E
SEM 71 5A

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Tap until flattened with the front edge of the 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 thoroughly 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 the 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 the groove to install.
b. Install the piston to the connecting rod.

Heat piston until 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.

Assemble so that the front mark on the piston crown and the
oil holes and 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 the groove to install.

After installing, make sure connecting rod moves smoothly.
11. Install piston rings.
CAUTION:
Do not damage 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.
PBIC0097E
SBIA0391E
KBIA2534E
Stamped mark Second ring : 2N
PBIC0100E

EM-80Revision: October 2005
CYLINDER BLOCK
2005 QX56
12. Install the connecting rod bearings to the connecting rod and
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 that 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 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.
14. Install connecting rod cap.

Match the stamped cylinder number marks on the connecting
rod with those on the cylinder cap to install.
15. Tighten connecting rod bolts using Tool.

Apply engine oil to threads and seats of connecting rod bolts.

After tightening bolts, make sure the crankshaft rotates
smoothly.

Check connecting rod side clearance. Refer to EM-89, "CON-
NECTING ROD SIDE CLEARANCE"
PBIC0266E
Tool number : EM03470000 (J-8037)
WBIA0626E
KBIA2536E
Tool number : KV10112100 (BT-8653-A
Connecting rod bolts
Step 1 : 19.6 N·m (1.5 kg-m, 11 ft-lb)
Step 2 : 90° clockwise
WBIA0627E

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16. Install knock sensor.
CAUTION:
If knock sensor is dropped, replace it with a new one.

Make sure that there is no foreign material on the cylinder
block mating surface and the back surface of knock sensor.

Install it with its connector facing the center of the cylinder
block side.

Do not tighten knock sensor bolts while holding connector.

Make sure knock sensor does not interfere with other parts.

Position the sub-harness as shown before installing intake
manifold.
17. Remove engine assembly from engine stand.
18. Install the pilot converter using suitable tool.

Install pilot converter as shown.
19. Assembly is in the reverse order of disassembly noting the following.
KBIA2493E
KBIA2549E
Outer diameter of drift
Pilot converter : Approx. 33 mm (1.30 in)
PBIC0899E
SEM 53 7E

EM-82Revision: October 2005
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CAUTION:

Ensure the dowel pin is installed in the crankshaft.

When installing the drive plate to crankshaft, be sure to
correctly align crankshaft side dowel pin and drive plate
side dowel pin hole.

Tighten drive plate bolts crosswise several times.
NOTE:

Install the drive plate and reinforcement plate in the direction
shown.

Secure the drive plate using suitable tool.

Tighten the drive plate bolts crosswise several times.

Unlock drive plate, remove tool.
20. Installation of the remaining components is in the reverse order of removal.
How to Select Piston and Bearing EBS00LMK
DESCRIPTION
*For the service parts, the grade for fitting cannot be selected between a piston pin and a connecting rod.
(Only 0 grade is available.) The information at the shipment from the plant is described as a reference.

The identification grade stamped on each part is the grade for the dimension measured in new condition.
This grade cannot apply to reused parts.

For reused or repaired parts, measure the dimension accurately. Determine the grade by comparing the
measurement with the values of each selection table.

For details of the measurement method of each part, the reuse standards, and the selection method of the
selective fitting parts, refer to the text.Drive plate bolts : 88.2 N·m (9.0 kg-m, 65 ft-lb)
KBIA2494E
Connecting points Connecting parts Selection items Selection methods
Between cylinder block to
crankshaftMain bearingMain bearing grade (bearing
thickness)Determined by match of cylin-
der block bearing housing
grade (Housing inside diame-
ter) and crankshaft journal
grade (journal outside diame-
ter)
Between crankshaft to connect-
ing rodConnecting rod bearingConnecting rod bearing grade
(bearing thickness)Connecting rod bearing grade
= crankshaft pin grade (pin
diameter). No grade exists for
inside diameter of connecting
rod large end.
Between cylinder block to pis-
tonPiston and piston pin assembly.
The piston is available together
with piston pin as an assembly.Piston grade (piston diameter)Piston grade = cylinder bore
grade (diameter of bore)
*Between piston to connecting
rod———

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HOW TO SELECT PISTON
Piston Selective Fitting When New Cylinder Block is Used:

Check the cylinder bore grade on the bottom face of the cylinder
block, and select the piston of the same grade.
When Cylinder Block is Reused
1. Measure cylinder block bore diameter.
2. Determine the bore grade by comparing the measurement with the values under the “Cylinder bore diam-
eter” of the piston selection table. Use oversized piston if the clearance of standard grade piston is outside
the specified value.
Piston Selection Table
Unit: mm (in)
CAUTION:
Oversize must be used in all cylinders when using oversized parts.
NOTE:

The piston is available together with piston pin as an assembly.

The piston pin (piston pin bore) grade is provided only for the parts installed at the plant. For service parts,
no grades can be selected (only 0 grade is available).

Hone cylinder to obtain specified clearance between the piston and cylinder bore when using an over-
sized piston. Be sure to use the same oversized piston rings.
KBIA2495E
KBIA2496E
Grade number (Mark) 1 2 3
Cylinder bore diameter 98.000-98.010 (3.8583-3.8587) 98.010-98.020 (3.8587-3.8590) 93.020-98.030 (3.8590-3.8594)
Piston diameter 97.980-97.990 (3.8575-3.8579) 97.990-98.000 (3.8579-3.8583) 98.000-98.010 (3.8583-3.8587)
Piston oversize (Service) : 0.20 mm (0.0079 in)

EM-84Revision: October 2005
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HOW TO SELECT CONNECTING ROD BEARING
When New Connecting Rod and Crankshaft are Used
1. Apply the big end inside diameter grade stamped on the con-
necting rod side face to the row in the “Connecting Rod Bearing
Selection Table”.
2. Apply the pin diameter grade stamped on the crankshaft front
side to the column in the “Connecting Rod Bearing Selection
Table”.
3. Read the symbol at the cross point of selected row and column
in the “Connecting Rod Bearing Selection Table”.
4. Apply the symbol obtained to the "Connecting Rod Bearing
Grade Table" to select.
When Crankshaft and Connecting Rod are Reused
1. Measure dimensions of the big end inside diameter of the connecting rod and diameter of the crankshaft
pin individually.
2. Apply the measured dimension to the “Connecting Rod Bearing Selection Table”.
3. The following steps are the same as in “When New Connecting Rod and Crankshaft are Used”. Refer to
EM-84
.
Connecting Rod Bearing Selection Table
Connecting Rod Bearing Grade Table.
KBIA2536E
PBIC0 110 E
KBIA2538E
Grade number Thickness “T” mm (in) Identification color (mark)
0 1.500 - 1.503 (0.0591 - 0.0592) Black
1 1.503 - 1.506 (0.0592 - 0.0593) Brown

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Undersize Bearings Usage Guide

When the specified oil clearance is not obtained with standard size connecting rod bearings, use under-
size (US) bearings.

When using undersize bearing, measure the bearing inside diameter with the bearing installed, and grind
the crankshaft pin so that the oil clearance satisfies the standard.
Bearing undersize table
Unit: mm (in)
CAUTION:
In grinding the crankshaft pin to use undersize bearings, keep
the fillet R (All crankshaft pins).
HOW TO SELECT MAIN BEARING
When New Cylinder Block and Crankshaft are Used
1. Apply the main bearing housing grade on the bottom face of the
cylinder block to the row in "Main Bearings Selection Table".
2. Apply the journal diameter grade on the crankshaft front to the
column in "Main Bearings Selection Table".
3. Read the symbol at the cross point of the selected row and column in the "Main Bearings Selection Table".
CAUTION:

Initial clearance for No. 1, 5 journal and No. 2, 3, 4 journal is different. Use two different selection
lists for each part.

No. 1, 5 journal and No. 2, 3, 4 journal have the same signs but different measures. Do not con-
fuse them.
4. Apply the symbol to the "Main Bearings Grade Table" to select.
NOTE:

Grade list applies to all journals.

Service parts are available as a set of both upper and lower.
2 1.506 - 1.509 (0.0593 - 0.0594) Green
3 1.509 - 1.512 (0.0594 - 0.0595) Yellow
Undersize Thickness
0.25 (0.0098) 1.627 - 1.635 (0.0641 - 0.0644)
Fillet R : 1.5 - 1.7 mm (0.059 - 0.067 in)
PB I C 0 111E
KBIA2495E
PBIC0 110 E

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When Cylinder Block and Crankshaft are Reused
1. Measure the inside diameter of the cylinder block main bearings housing and the outside diameter of the
crankshaft journal.
2. Apply measurement in above step 1 to "Main Bearings Selection Table".
3. The following steps are the same as in “When New Cylinder Block and Crankshaft are Used”. Refer to
EM-85
.
Main Bearings Selection Table (No. 1 and No. 5 journal)
WBIA0608E

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Main Bearings Selection Table (No. 2, 3 and 4 journal)
WBIA0609E