height INFINITI QX56 2006 Factory Owner's Guide

EM-2Revision: November 20092006 QX56
TIMING CHAIN .......................................................
... 37
Removal and Installation ..................................... ... 37
REMOVAL ........................................................ ... 38
INSPECTION AFTER REMOVAL ..................... ... 40
INSTALLATION ................................................. ... 41
CAMSHAFT ............................................................ ... 46
Removal and Installation ..................................... ... 46
REMOVAL ........................................................ ... 46
INSPECTION AFTER REMOVAL ..................... ... 50
INSTALLATION ................................................. ... 52
Valve Clearance ................................................... ... 55
INSPECTION .................................................... ... 55
ADJUSTMENT ................................................. ... 58
OIL SEAL ............................................................... ... 60
Removal and Installation of Valve Oil Seal .......... ... 60
REMOVAL ........................................................ ... 60
INSTALLATION ................................................. ... 60
Removal and Installation of Front Oil Seal .......... ... 61
REMOVAL ........................................................ ... 61
INSTALLATION ................................................. ... 61
Removal and Installation of Rear Oil Seal ........... ... 61
REMOVAL ........................................................ ... 61
INSTALLATION ................................................. ... 62
CYLINDER HEAD .................................................. ... 63
On-Vehicle Service .............................................. ... 63
CHECKING COMPRESSION PRESSURE ......... 63
Removal and Installation ..................................... ... 64
REMOVAL ........................................................ ... 64
INSPECTION AFTER REMOVAL ..................... ... 65
INSTALLATION ................................................. ... 65
Disassembly and Assembly ................................. ... 66
DISASSEMBLY ................................................ ... 66
ASSEMBLY ...................................................... ... 67
Inspection After Disassembly .............................. ... 68
CYLINDER HEAD DISTORTION ..................... ... 68
VALVE DIMENSIONS ....................................... ... 69
VALVE GUIDE CLEARANCE ........................... ... 69
VALVE GUIDE REPLACEMENT ...................... ... 70
VALVE SEAT CONTACT .................................. ... 71
VALVE SEAT REPLACEMENT ........................ ... 71
VALVE SPRING SQUARENESS ...................... ... 73
VALVE SPRING DIMENSIONS AND VALVE
SPRING PRESSURE LOAD ............................ ... 73
ENGINE ASSEMBLY ................................................ 74 Removal and Installation ..................................... ... 74
REMOVAL ........................................................ ... 74
INSTALLATION ................................................. ... 76
INSPECTION AFTER INSTALLATION ............. ... 76CYLINDER BLOCK ................................................
... 78
Disassembly and Assembly ................................. ... 78
DISASSEMBLY ................................................. ... 79
ASSEMBLY ....................................................... ... 82
How to Select Piston and Bearing ....................... ... 87
DESCRIPTION ................................................. ... 87
HOW TO SELECT PISTON .............................. ... 87
HOW TO SELECT CONNECTING ROD BEAR-
ING .................................................................... ... 88
HOW TO SELECT MAIN BEARING ................. ... 90
Inspection After Disassembly ............................... ... 94
CRANKSHAFT END PLAY ............................... ... 94
CONNECTING ROD SIDE CLEARANCE ........ ... 94
PISTON AND PISTON PIN CLEARANCE ........ ... 94
PISTON RING SIDE CLEARANCE .................. ... 95
PISTON RING END GAP ................................. ... 95
CONNECTING ROD BEND AND TORSION .... ... 96
CONNECTING ROD BEARING (BIG END) ..... ... 96
CONNECTING ROD BUSHING OIL CLEAR-
ANCE (SMALL END) ........................................ ... 96
CYLINDER BLOCK DISTORTION ................... ... 97
MAIN BEARING HOUSING INSIDE DIAMETER ... 98
PISTON TO CYLINDER BORE CLEARANCE . ... 98
CRANKSHAFT JOURNAL DIAMETER ............ ... 99
CRANKSHAFT PIN DIAMETER ....................... .100
OUT-OF-ROUND AND TAPER OF CRANK-
SHAFT .............................................................. .100
CRANKSHAFT RUNOUT ................................. .100
CONNECTING ROD BEARING OIL CLEAR-
ANCE ................................................................ .100
MAIN BEARING OIL CLEARANCE .................. .101
CRUSH HEIGHT OF MAIN BEARING ............. .102
CRUSH HEIGHT OF CONNECTING ROD
BEARING .......................................................... .102
MAIN BEARING CAP BOLT DIAMETER .......... .102
CONNECTING ROD BOLT DIAMETER ........... .103
SERVICE DATA AND SPECIFICATIONS (SDS) ... .104
Standard and Limit ............................................... .104
GENERAL SPECIFICATIONS .......................... .104
DRIVE BELTS ................................................... .104
EXHAUST MANIFOLD ..................................... .104
CAMSHAFT AND CAMSHAFT BEARING ........ .105
CYLINDER HEAD ............................................. .107
CYLINDER BLOCK ........................................... .109
PISTON, PISTON RING AND PISTON PIN ..... .110
CONNECTING ROD ......................................... .110
CRANKSHAFT .................................................. . 111
MAIN BEARING ................................................ .112

EM-22Revision: November 2009
EXHAUST MANIFOLD AND THREE WAY CATALYST
2006 QX56
b. Remove the air fuel ratio A/F sensors from both left and rightexhaust manifolds using Tool.
CAUTION:

Do not damage the air fuel ratio A/F sensors

Discard any air fuel ratio A/F sensor which has been
dropped from a height of more than 0.5m (19.7 in) onto a
hard surface such as a concrete floor. Replace it with a
new one.
8. Support engine using a suitable tool.
9. Remove the exhaust manifold (LH) following the steps below.
a. Remove the engine mounting insulator. Refer to EM-74
.
b. Remove the exhaust manifold cover.
c. Remove the engine mounting bracket. Refer to EM-74
.
d. Loosen the nuts in reverse order as shown using power tool.
e. Remove the exhaust manifold (LH) (A).
10. Remove the exhaust manifold (RH) following the steps below.
a. Remove the engine mounting insulator. Refer to EM-74
.
b. Remove the exhaust manifold cover.
c. Remove the engine mounting bracket. Refer to EM-74
.
d. Remove the oil level gauge guide. Refer to EM-24
.
e. Loosen the nuts in reverse order as shown using power tool.
f. Remove the exhaust manifold (RH) (B).
INSPECTION AFTER REMOVAL
Surface Distortion

Check the flatness of each exhaust manifold flange surface
using suitable tools.

If measurement exceeds the limit, replace the exhaust manifold.
INSTALLATION
Installation is in the reverse order of removal. Tool number : — (J-44626)
WBIA0630E
WBIA0696E
WBIA0696E
Flatness limit : 0.3 mm (0.012 in)
KBIA2504E

EM-50Revision: November 2009
CAMSHAFT
2006 QX56
INSPECTION AFTER REMOVAL
Camshaft Runout
1. Put V block on precise flat work bench, and support No. 1 andNo. 5 journals of the camshaft.
2. Set dial indicator vertically to No. 3 journal.
3. Turn the camshaft to one direction, and measure the camshaft runout on dial indicator (total indicator reading).

If measurement exceeds specification, replace the camshaft.
Camshaft Cam Height

Measure the camshaft cam height.

If measurement is not within the specifications, replace the cam-
shaft.
Camshaft Journal Clearance
Camshaft Journal Diameter

Measure the diameter of the camshaft journal.
Camshaft Bracket Inner Diameter

Tighten the camshaft bracket bolt to the specified torque.

Measure the inner diameter of the camshaft bracket.
Calculation of Camshaft Journal Clearance
(Journal clearance) = (camshaft bracket inner diameter) – (camshaft
journal diameter)

If measurement is not within specification, replace either or both
camshaft and cylinder head.
NOTE:
The inner diameter of the camshaft bracket is manufactured together with the cylinder head. Replace the
whole cylinder head as an assembly. Camshaft runout : Less than 0.02 mm (0.0008 in)
EMK0641D
Standard cam height
(intake & exhaust)
: 44.465 - 44.655 mm
(1.7506 - 1.7581 in)
Cam wear limit
(intake & exhaust) : 0.02 mm (0.0008 in)
PBIC0039E
Standard diameter : 25.953 - 25.970 mm
(1.0218 - 1.0224 in)
PBIC0040E
Standard : 26.000 - 26.021 mm (1.0236 - 1.0244 in)
Standard : 0.030 - 0.068 mm (0.0012 - 0.0027 in)
PBIC1645E

EM-60Revision: November 2009
OIL SEAL
2006 QX56
OIL SEALPFP:00100
Removal and Installation of Valve Oil SealEBS00RFA
REMOVAL
1. Remove the camshaft relating to the valve oil seal to be removed. Refer to EM-46, "Removal and Installa-
tion" .
2. Remove the valve lifters. Refer to EM-46, "
Removal and Installation" .

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-A)
: KV10115900 (J-26336-20)
: KV10109220 ( — )
WBIA0578E
Tool number : KV10107902 (J-38959)
WBIA0478E
Tool number : KV10115600 (J-38958)
Height "H" (without valve spring installed) Intake and exhaust : 14.3 - 14.9 mm (0.563 - 0.587 in)
WBIA0490E

OIL SEALEM-61
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Revision: November 2009 2006 QX56
Removal and Installation of Front Oil SealEBS00RFB
REMOVAL
1. Remove the engine. Refer to EM-74, "Removal and Installation" .
2. Remove the crankshaft pulley. Refer to EM-37, "
TIMING CHAIN" .
3. 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 SealEBS00RFC
REMOVAL
1. Remove the transmission assembly. Refer to AT- 2 4 3 , "Removal and Installation (2WD)" or AT- 2 4 6 ,
"Removal and Installation (4WD)" .
SBIA0359E
SEM715A
PBIC2931E

CYLINDER HEADEM-67
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7. Remove the valve oil seal using Tool.
8. Replace the valve seat if necessary. Refer to EM-71, "
VALVE SEAT REPLACEMENT" .
9. Replace the valve guide if necessary. Refer to EM-70, "
VALVE GUIDE REPLACEMENT" .
10. Remove the spark plug tube, as necessary.

Remove the spark plug tube out of the cylinder head using suitable tool.
CAUTION:

Do not damage the cylinder head.

Do not remove the spark plug tube unless absolutely necessary. Once removed, the spark
plug tube will be deformed and cannot be reused.
ASSEMBLY
1. Install the valve guide if necessary. Refer to EM-70, "VALVE GUIDE REPLACEMENT" .
2. Install the valve seat if necessary. Refer to EM-71, "
VALVE SEAT REPLACEMENT" .
3. 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".
4. Install the valves in their original position.
5. Install the valve spring seats.
6. Install the valve springs.

Install the narrow pitch end (paint mark side) to the cylinder
head side.
7. Install the valve spring retainers. Tool number
: KV10107902 (J-38959)
WBIA0478E
Tool number : KV10115600 (J-38958)
Height "H" (without valve spring installed)
Intake and exhaust : 14.3 - 14.9 mm (0.563 - 0.587 in)
WBIA0490E
SEM085D

EM-68Revision: November 2009
CYLINDER HEAD
2006 QX56
8. Install the valve collet using Tool. CAUTION:
When working, take care not to damage valve lifter holes.
9. Install the valve lifters.

Install the removed parts in their original locations.

If installing new lifters, select the correct size lifter for proper valve clearance. Refer to EM-55, "Va l v e
Clearance" .
10. Install the spark plug tube if necessary, following the procedure below.
a. Remove any old liquid gasket adhering to the cylinder-head spark plug tube hole.
b. Apply liquid gasket to area within approximately 12 mm (0.47 in) from the edge of the spark plug tube press-fit side.
Use Genuine RTV Silicone Sealant or equivalent. Refer to GI-46, "
Recommended Chemical Prod-
ucts and Sealants" .
c. Press-fit the spark plug tube to the specified height “H” using
suitable tool.
CAUTION:

When press-fitting, take care not to deform the spark plug
tube.

After press-fitting, wipe off any liquid gasket protruding
onto the cylinder-head upper face.
11. Install the spark plugs.
Inspection After DisassemblyEBS00RFG
CYLINDER HEAD DISTORTION
1. Remove any oil, scale, gasket, sealant and carbon deposits from the cylinder head surface. CAUTION:
Do not allow any debris to enter the oil or coolant passages.
2. Measure the bottom surface of the cylinder head for distortion in six directions as shown, using suitable tools.

If measurement exceeds the limit, replace the cylinder head.Tool number : KV10116200 (J-26336-A)
: KV10115900 (J-26336-20)
: KV10109220 ( — )
WBIA0578E
Standard press-fit height “H” :38.4 - 39.4 mm (1.512 - 1.551 in)
KBIA1248E
Standard : 0.03 mm (0.0012 in)
Limit : 0.1mm (0.004 in)
PBIC0075E

CYLINDER HEADEM-73
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VALVE SPRING SQUARENESS

Set try square along the side of valve spring and rotate the
spring. Measure the maximum clearance between the top face
of spring and try square.

If measurement is not within specifications, replace the valve
spring.
VALVE SPRING DIMENSIONS AND VALVE SPRING PRESSURE LOAD

Check the valve spring pressure at the specified spring height.

If measurement is not within specifications, replace the valve spring.Limit : Less than 2.2 mm (0.087 in)
PBIC0080E
Standard:
Intake and exhaustFree height: 50.58 mm (1.9913 in)
Installation height: 37.0 mm (1.457 in)
Installation pressure: 165.8 - 187.0 N (16.9 - 19.1 kg, 37- 42 lb)
Height during valve open: 28.2 mm (1.110 in)
Load with valve open: 314.8 - 355.0 N (32.1 - 36.2 kg, 71 - 80 lb)
SEM113

EM-102Revision: November 2009
CYLINDER BLOCK
2006 QX56
Method of Using Plastigage

Remove oil and dust on the crankshaft journal and surfaces of
each bearing completely.

Cut a plastigage slightly shorter than the bearing width, and
place it in crankshaft axial direction, avoiding oil holes.

Install the main bearings to the cylinder block and main bearing
cap, and tighten the main bearing bolts to the specified torque.
CAUTION:
Do not rotate crankshaft with plastigage installed.

Remove bearing cap and bearings. Measure plastigage width
using the scale on the plastigage bag.
NOTE:
The procedure when the measured value exceeds the repair limit is the same as that described in
“Method of Measurement”.
CRUSH HEIGHT OF MAIN BEARING

When the bearing cap is removed after being tightened to the
specified torque with main bearings installed, the tip end of the
bearing must protrude. Refer to EM-82, "
ASSEMBLY" for the
tightening procedure.

If standard is not met, replace main bearings.
CRUSH HEIGHT OF CONNECTING ROD BEARING

When connecting rod bearing cap is removed after being tight-
ened to the specified torque with the connecting rod bearings
installed, the tip end of the bearing must protrude. Refer to EM-
82, "ASSEMBLY" for tightening procedure.

If standard is not met, replace connecting rod bearings.
MAIN BEARING CAP BOLT DIAMETER

Check for bolts (M9 and M12) installed from lower side using the
following procedure.
NOTE:

Side bolt (M10) is outside the target.

Figure shows M12 bolt.

Measure bolt diameter ″d1″ from tip of the bolt to dimension "a".

Measure bolt diameter ″d2 ″ from the dimension between tip of
the bolt and dimension ″b ″ as base station to dimension ″c ″.
NOTE:
If a narrower part in the threads is determined by visual check,
measure ″d2 ″ at that point.

Calculate the difference between ″d1 ″ and ″d2 ″.
KBIA2551E
Standard : There must be crush height
SEM502G
Standard : There must be crush height.
PBIC1646E
KBIA2497E

SERVICE DATA AND SPECIFICATIONS (SDS)EM-105
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CAMSHAFT AND CAMSHAFT BEARING
Unit: mm (in)
*: Total indicator reading
Valve Lifter
Unit: mm (in)
Valve Clearance
Unit: mm (in)
*: Approximately 80 °C (176°F)
Items
Standard
Camshaft runout [TIR*] Less than 0.02 (0.0008)
Camshaft cam height “A ” Intake & Exhaust 44.465 - 44.655 (1.7506 - 1.7581)
Cam wear limit 0.02 (0.0008)
Outside diameter of camshaft journal 25.953 - 25.970 (1.0218 - 1.0224)
Camshaft bracket inside diameter 26.000 - 26.021 (1.0236 - 1.0244)
Camshaft journal clearance 0.030 - 0.068 (0.0012 - 0.0027)
Camshaft end play 0.115 - 0.188 (0.0045 - 0.0074)
Camshaft sprocket runout [TIR*] Less than 0.15 (0.0059)
SEM671
Items Standard
Valve lifter diameter 33.977 - 33.987 (1.3377 - 1.3381)
Valve lifter hole diameter 34.000 - 34.016 (1.3386 - 1.3392)
Clearance between lifter and lifter guide 0.013 - 0.039 (0.0005 - 0.0015)
Items Hot* Cold
Intake 0.304 - 0.416 (0.012 - 0.016) 0.26 - 0.34 (0.010 - 0.013)
Exhaust 0.308 - 0.432 (0.012 - 0.017) 0.29 - 0.37 (0.011 - 0.015)