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Nissan Pathfinder (2010 year). Manual - part 370

EM-88

< ON-VEHICLE REPAIR >

[VQ40DE]

CYLINDER HEAD

1. Install new cylinder head gasket.
2. Turn crankshaft until No. 1 piston is set at TDC.

• Crankshaft key should line up with the right bank cylinder cen-

ter line as shown.

3. Install cylinder head follow the steps below to tighten cylinder

head bolts in numerical order as shown.

CAUTION:

If cylinder head bolts re-used, check their outer diameters

before installation. Refer to

EM-86, "Removal and Installa-

tion"

(Cylinder Head Bolts Outer Diameter).

Measure the tightening angle using Tool.

SEM532G

Step a

: 98 N·m (10 kg-m, 72 ft-lb)

Step b

: Loosen to 0 N·m in the reverse order of tight-
ening.

Step c

: 39.2 N·m (4.0 kg-m, 29 ft-lb)

PBIC2057E

Tool number

: KV10112100 (BT-8653-A)

Step d

: 90

clockwise

Step e

: 90

clockwise

WBIA0581E

2010 Pathfinder

CYLINDER HEAD

EM-89

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[VQ40DE]

4. After installing cylinder head, measure distance between front

end faces of cylinder block and cylinder head (left and right

banks).

• If the measured value is out of the standard, re-install cylinder

head.

5. Installation of the remaining parts is in the reverse order of removal.

INSPECTION AFTER INSTALLATION

• Before starting the engine, check oil/fluid levels including engine coolant and engine oil. If the levels are

lower than required quantity, fill to the specified level. Refer to

MA-16, "For North America"

• Use procedure below to check for fuel leakage.

• Turn ignition switch ON (with engine stopped). With fuel pressure applied to the fuel piping, check for fuel

leakage at the connection points.

• Start engine. With engine speed increased, check again for fuel leakage at connection points.

• Run engine to check for unusual noise and vibration.

NOTE:

If hydraulic pressure inside timing chain tensioner drops after removal and installation, slack in the guide

may generate a pounding noise during and just after engine start. However, this is normal. Noise will stop

after hydraulic pressure rises.

• Warm up engine thoroughly to make sure there is no leakage of fuel, exhaust gas, or any oil/fluids including

engine oil and engine coolant.

• Bleed air from passages in lines and hoses, such as in cooling system.

• After cooling down the engine, again check oil/fluid levels including engine oil and engine coolant. Refill to

specified level if necessary.

• Summary of the inspection items:

* Transmission/transaxle/CVT fluid, power steering fluid, brake fluid, etc.

Standard

: 14.1 - 14.9 mm (0.555 - 0.587 in)

EMQ0662D

Item

Before starting engine

Engine running

After engine stopped

Engine coolant

Level

Leakage

Level

Engine oil

Level

Leakage

Level

Other oils and fluids*

Level

Leakage

Level

Fuel

Leakage

Exhaust gas

—

Leakage

—

2010 Pathfinder

EM-90

< ON-VEHICLE REPAIR >

[VQ40DE]

CYLINDER HEAD

Exploded View

INFOID:0000000005260470

Disassembly and Assembly

INFOID:0000000005260471

DISASSEMBLY

1. Remove spark plug.
2. Remove valve lifter.

• Identify installation positions, and store them without mixing them up.

3. Remove valve collet.

• Compress valve spring and remove valve collet with magnet

hand using Tool.

CAUTION:

When working, take care not to damage valve lifter holes.

4. Remove valve spring retainer, valve spring and valve spring seat.
5. Push valve stem to combustion chamber side, and remove valve.

• Identify installation positions, and store them without mixing them up.

Valve lifter

Valve collet

Valve spring retainer

Valve spring

Valve oil seal

Valve spring seat

Valve guide

Spark plug

Spark plug tube

10. Cylinder head (right bank)

11. Valve seat

12. Valve (EXH)

13. Valve (INT)

14. Cylinder head (left bank)

PBIC2637E

Tool numbers

: KV10109220 (

—

)

: KV10116200 (J-26336-B)
: KV10115900 (J-26336-20)

WBIA0578E

2010 Pathfinder

CYLINDER HEAD

EM-91

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[VQ40DE]

6. Remove valve oil seals using Tool.

7. If valve seat must be replaced, refer to

EM-92, "Inspection After Disassembly"

8. If valve guide must be replaced, refer to

EM-92, "Inspection After Disassembly"

9. Remove spark plug tube, as necessary.

• Using pair of pliers, pull spark plug tube out of cylinder head.

CAUTION:

• Take care not to damage cylinder head.

• Once removed, spark plug tube will be deformed and cannot be reused. Do not remove it unless

absolutely necessary.

ASSEMBLY

1. When valve guide is removed, install it. Refer to

EM-92, "Inspection After Disassembly"

2. When valve seat is removed, install it. Refer to

EM-92, "Inspection After Disassembly"

3. Install valve oil seals using Tool.

4. Install valve spring seat.
5. Install valves.

• Install it in the original position.

NOTE:

Larger diameter valves are for intake side.

6. Install valve spring (uneven pitch type).

• Install narrow pitch end (paint mark) to cylinder head side

(valve spring seat side).

7. Install valve spring retainer.

Tool number

: KV10107902 (J-38959)

WBIA0489E

Tool number

—

(J-39386)

Height "H" (Without valve spring seat installed)

Intake and exhaust

: 14.3 - 14.9 mm (0.563 - 0.587 in)

WBIA0490E

SEM085D

2010 Pathfinder

EM-92

< ON-VEHICLE REPAIR >

[VQ40DE]

CYLINDER HEAD

8. Install valve collet.

• Compress valve spring using Tool, attachment and adapter

using Tool. Install valve collet with magnet hand.

CAUTION:

When working, take care not to damage valve lifter holes

or valve stems.

• Tap valve stem edge lightly with plastic hammer after installa-

tion to check its installed condition.

9. Install valve lifter.

• Install it in the original position.

10. Install spark plug tube.

• Press-fit spark plug tube as follows:

a. Remove old liquid gasket adhering to cylinder head mounting hole.
b. Apply sealant to area within approximately 12 mm (0.47 in) from edge of spark plug tube press-fit side.

Use Genuine High Strength Locking Sealant or equivalent. Refer to

GI-14, "Recommended Chemi-

cal Products and Sealants"

Press-fit spark plug tube so that its height “H” is as specified

using suitable drift.

CAUTION:

• When press-fitting, take care not to deform spark plug

tube.

• After press-fitting, wipe off liquid gasket protruding onto

cylinder-head upper face.

11. Install spark plug.

Inspection After Disassembly

INFOID:0000000005260472

VALVE DIMENSIONS

• Check dimensions of each valve. For dimensions, refer to

EM-128, "Standard and Limit"

• If dimensions are out of the standard, replace valve and check the valve seat contact.

VALVE GUIDE CLEARANCE

Valve Stem Diameter

Measure the diameter of valve stem with micrometer.

Valve Guide Inner Diameter

Measure the inner diameter of valve guide with inside micrometer.

Tool numbers

: KV10109220 (

—

)

: KV10116200 (J-26336-B)
: KV10115900 (J-26336-20)

WBIA0578E

Standard press-fit height “H”

: 38.1 - 39.1 mm (1.500 - 1.539 in)

PBIC2638E

Standard

Intake

: 5.965 - 5.980 mm (0.2348 - 0.2354 in)

Exhaust

: 5.955 - 5.970 mm (0.2344 - 0.2350 in)

SEM938C

2010 Pathfinder

CYLINDER HEAD

EM-93

< ON-VEHICLE REPAIR >

[VQ40DE]

Valve Guide Clearance

(Valve guide clearance) = (Valve guide inner diameter) – (Valve stem diameter).

• If the calculated value exceeds the limit, replace valve and/or valve guide.

VALVE GUIDE REPLACEMENT

When valve guide is removed, replace with oversized [0.2 mm (0.008 in)] valve guide.
1. To remove valve guide, heat cylinder head to 110

to 130

(230

to 266

F) by soaking in heated oil.

2. Drive out valve guide with a press [under a 20 kN (2 ton, 2.2 US

ton, 2.0 Imp ton) pressure] or hammer and suitable tool.

WARNING:

Cylinder head contains heat. When working, wear protec-

tive equipment to avoid getting burned.

3. Ream cylinder head valve guide hole using suitable tool.

Standard

Intake and Exhaust

: 6.000 - 6.018 mm (0.2362 - 0.2369 in)

Valve guide clearance:
Standard

Intake

: 0.020 - 0.053 mm (0.0008 - 0.0021 in)

Exhaust : 0.030 - 0.063 mm (0.0012 - 0.0025 in)

Limit

Intake

: 0.08 mm (0.003 in)

Exhaust : 0.09 mm (0.004 in)

SEM008A

SEM931C

Valve guide hole diameter (for service parts):

Intake and exhaust

: 10.175 - 10.196 mm (0.4006 - 0.4014 in)

SEM932C

2010 Pathfinder

EM-94

< ON-VEHICLE REPAIR >

[VQ40DE]

CYLINDER HEAD

4. Heat cylinder head to 110

to 130

C (230

to 266

F) by soaking

in heated oil.

5. Press valve guide from camshaft side to the dimensions as

shown using suitable tool.

WARNING:

Cylinder head contains heat. When working, wear protec-

tive equipment to avoid getting burned.

6. Apply reamer finish to valve guide using suitable tool.

VALVE SEAT CONTACT

• After confirming that the dimensions of valve guides and valves are

within the specifications, perform this procedure.

• Apply prussian blue (or white lead) onto contacting surface of valve

seat to check the condition of the valve contact on the surface.

• Check if the contact area band is continuous all around the circum-

ference.

• If not, grind to adjust valve fitting and check again. If the contacting

surface still has “NG” conditions even after the re-check, replace

valve seat.

VALVE SEAT REPLACEMENT

When valve seat is removed, replace with oversized [0.5 mm (0.020 in)] valve seat.
1. Bore out old seat until it collapses. Boring should not continue beyond the bottom face of the seat recess

in cylinder head. Set the machine depth stop to ensure this. Refer to

EM-128, "Standard and Limit"

CAUTION:

Do not scratch cylinder head by excessive boring.

SEM008A

Projection “L”

Intake and exhaust

: 12.6 - 12.8 mm (0.496 - 0.504 in)

SEM950E

Standard:

Intake and exhaust

: 6.000 - 6.018 mm (0.2362 - 0.2369 in)

SEM932C

SBIA0322E

2010 Pathfinder

CYLINDER HEAD

EM-95

< ON-VEHICLE REPAIR >

[VQ40DE]

2. Ream cylinder head recess diameter for service valve seat.

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

This will enable valve to fit correctly.

3. Heat cylinder head to 110

to 130

C (230

to 266

F) by soaking

in heated oil.

4. Provide valve seats cooled well with dry ice. Force fit valve seat into cylinder head.

WARNING:

• Cylinder head contains heat. When working, wear protective equipment to avoid getting burned.

CAUTION:

• Avoid directly touching cold valve seats.

5. Finish seat to the specified dimensions using suitable tool. Refer

EM-128, "Standard and Limit"

CAUTION:

When using valve seat cutter, firmly grip cutter handle with

both hands. Then, press on the contacting surface all

around the circumference to cut in a single drive. Improper

pressure on cutter or cutting many different times may

result in staged valve seat.

6. Using compound, grind to adjust valve fitting.
7. Check again for normal contact.

VALVE SPRING SQUARENESS

• Set try square along the side of valve spring and rotate spring.

Measure the maximum clearance between the top face of spring

and try square.

• If it exceeds the limit, replace valve spring.

VALVE SPRING DIMENSIONS AND VALVE SPRING PRESSURE LOAD

Oversize [0.5 mm (0.020 in)]

Intake

: 38.500 - 38.516 mm (1.5157 - 1.5164 in)

Exhaust

: 32.700 - 32.716 mm (1.2874 - 1.2880 in)

SEM795A

SEM008A

SEM934C

Limit

: 2.1 mm (0.083 in)

PBIC0080E

2010 Pathfinder

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