Nissan Pathfinder (2009 year). Instruction — part 394

OIL SEAL

EM-209

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• Install the rear oil seal so that each seal lip is oriented as

shown.

• Press-fit the rear oil seal using suitable tool.

CAUTION:

• Do not damage the crankshaft or oil seal retainer.
• Press-fit the oil seal straight to avoid causing burrs or

tilting.

• Do not touch grease applied onto the oil seal lip.
• Do not damage or scratch the outer circumference of

the rear oil seal.

• Tap until flush with the front edge of the oil seal retainer.

3.

Installation of the remaining components is in the reverse order of removal.

CAUTION:

• When replacing an engine or transmission you must make sure the dowels are installed cor-

rectly during re-assembly.

• Improper alignment caused by missing dowels may cause vibration, oil leaks or breakage of

drivetrain components.

SEM715A

WBIA0438E

2009 Pathfinder

EM-210

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CYLINDER HEAD

CYLINDER HEAD

Exploded View

INFOID:0000000003939568

Removal and Installation

INFOID:0000000003939569

REMOVAL

1.

Remove the engine assembly from the vehicle. Refer to

EM-220, "Removal and Installation"

.

2.

Remove the following components and related parts:
• Drive belt auto tensioner drive belts and idler pulley. Refer to

EM-155, "Removal and Installation"

• Thermostat housing and water piping. Refer to

CO-54, "Removal and Installation"

.

• Fuel tube and fuel injector assembly. Refer to

EM-182, "Removal and Installation"

.

• Intake manifold. Refer to

EM-168, "Removal and Installation"

.

• Starter. Refer to

STR-22, "Removal and Installation"

.

• Rocker cover. Refer to

EM-180, "Removal and Installation"

.

• Generator and generator bracket. Refer to

CHG-20, "Removal and Installation"

.

• Oil pan and oil strainer. Refer to

EM-175, "Removal and Installation"

.

3.

Remove the crankshaft pulley, front cover, oil pump, and timing chain. Refer to

EM-187, "Removal and

Installation"

.

4.

Remove the camshaft sprockets and camshafts. Refer to

EM-195, "Removal and Installation"

.

5.

Remove the cylinder head bolts in reverse of order shown.

6.

Remove the cylinder heads.

INSPECTION AFTER REMOVAL

Cylinder Head Bolts Diameter

1.

Harness bracket

2.

Engine coolant temperature sensor

3.

Washer

4.

Cylinder head gasket (LH)

5.

Cylinder head (RH)

6.

Cylinder head bolt

7.

Cylinder head gasket (RH)

8.

Cylinder head (LH)

KBIA2528E

PBIC0068E

2009 Pathfinder

CYLINDER HEAD

EM-211

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• Cylinder head bolts are tightened by plastic zone tightening

method. Whenever the size difference between (d1) and (d2)
exceeds the limit, replace the bolt with a new one.

• If reduction of diameter appears in a position other than (d2), use it

as (d2) point.

INSTALLATION

1.

Install a new cylinder head gasket.

2.

Install the cylinder head. Follow the steps below to tighten the
bolts in the numerical order shown.

CAUTION:

• If cylinder head bolts are re-used, check their diameters

before installation. Follow the "Cylinder Head Bolts Diam-
eter" procedure.

a.

Apply engine oil to threads and seating surface of the bolts.

b.

Measure the tightening angle using Tool.

CAUTION:

Measure the tightening angle using Tool. Do not measure
visually.

3.

Installation of the remaining components 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-12, "Fluids and Lubricants"

.

• 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:

Limit (d1 - d2)

: 0.23 mm (0.0091 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

Step d

: 70

°

clockwise

Tool number

: KV10112100 (BT-8653-A)

WBIA0603E

2009 Pathfinder

EM-212

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CYLINDER HEAD

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

Exploded View

INFOID:0000000003939570

Disassembly and Assembly

INFOID:0000000003939571

DISASSEMBLY

1.

Remove the spark plug. Refer to

EM-158, "Removal and Installation"

.

2.

Remove the valve lifter.
• Identify the installation positions, and store them without mixing them up.

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

Leakage

Leakage

Exhaust gas

—

Leakage

—

1.

Spark plug

2.

Valve lifter

3.

Valve collet

4.

Valve spring retainer

5.

Valve spring

6.

Valve spring seat

7.

Valve oil seal

8.

Valve guide

9.

Valve seat

10.

Valve (INT)

11.

Valve (EXH)

12.

Cylinder head (LH bank)

13.

Spark plug tube

14.

Cylinder head (RH bank)

WBIA0470E

2009 Pathfinder

CYLINDER HEAD

EM-213

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3.

Remove the valve collet using Tool.

CAUTION:

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

4.

Remove the valve spring retainer, valve spring and valve spring
seat.

5.

Inspect the valve guide clearance. Refer to

EM-214, "Inspection

After Disassembly"

.

6.

Push the valve stem to the combustion chamber side, and remove the valve.
• Identify the installation positions, and store them without mixing them up.

7.

Remove the valve oil seal using Tool.

8.

Replace the valve seat if necessary. Refer to

EM-214, "Inspection After Disassembly"

.

9.

Replace the valve guide if necessary. Refer to

EM-214, "Inspection After Disassembly"

.

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-214, "Inspection After Disassembly"

.

2.

Install the valve seat if necessary. Refer to

EM-214, "Inspection After Disassembly"

.

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.

Tool number

: KV10116200 (J-26336-B)

: KV10115900 (J-26336-20)

: KV10109220 (

—

)

Tool number

: KV10107902 (J-38959)

WBIA0578E

WBIA0478E

Tool number

: KV10115600 (J-38958)

Height "H" (without valve spring installed)

Intake and exhaust

: 14.300 - 14.900 mm (0.5630 -
0.5870 in)

WBIA0490E

2009 Pathfinder

EM-214

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CYLINDER HEAD

6.

Install the valve springs.
• Install the narrow pitch end (paint mark side) to the cylinder

head side.

7.

Install the valve spring retainers.

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-214, "Inspec-

tion After Disassembly"

.

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-26, "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 Disassembly

INFOID:0000000003939572

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.

SEM085D

Tool number

: KV10116200 (J-26336-B)

: KV10115900 (J-26336-20)

: KV10109220 (

—

)

WBIA0578E

Standard press-fit height “H”

:38.4 - 39.4 mm
(1.512 - 1.551 in)

KBIA1248E

2009 Pathfinder

CYLINDER HEAD

EM-215

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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.

VALVE DIMENSIONS

• Check the dimensions of each valve. Refer to

EM-250, "Standard

and Limit"

.

• If the dimensions are out of the standard, replace the valve.

VALVE GUIDE CLEARANCE

Valve Stem Diameter

Measure the diameter of the valve stem using suitable tool.

Valve Guide Inside Diameter

Measure the inside diameter of the valve guide using suitable tool.

Valve Guide Clearance

• (Valve guide clearance) = (Valve guide inside diameter) – (Valve stem diameter).

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

replaced, follow the valve guide replacement procedure.

Standard

: 0.03 mm (0.0012 in)

Limit

: 0.1 mm (0.004 in)

PBIC0075E

SEM188A

Standard

Intake

: 5.965 - 5.980 mm (0.2348 - 0.2354 in)

Exhaust

: 5.955 - 5.970 mm (0.2344 - 0.2350 in)

SEM938C

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 (0.0031 in)

Exhaust

: 0.09 mm (0.0035 in)

2009 Pathfinder

EM-216

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CYLINDER HEAD

VALVE GUIDE REPLACEMENT

When the valve guide is removed, replace it with an oversized (0.2 mm, 0.008 in) valve guide.
1.

To remove the valve guide, heat the cylinder head to 110

°

to

130

°

C (230

°

to 266

°

F) by soaking it in heated oil.

2.

Remove the valve guide using suitable tool.

WARNING:

Cylinder head contains heat. When working, wear protec-
tive equipment to avoid getting burned.

3.

Ream the cylinder head valve guide hole using suitable tool.

4.

Heat the cylinder head to 110

°

to 130

°

C (230

°

to 266

°

F) by

soaking it in heated oil.

SEM008A

SEM931C

Valve guide hole diameter:

Standard

Intake and exhaust

: 9.975 - 9.996 mm (0.3927 -
0.3935 in)

Oversize (service)

Intake and exhaust

: 10.175 - 10.196 mm (0.4006
- 0.4014 in)

SEM932C

SEM008A

2009 Pathfinder