Nissan Pathfinder (2011 year). Instruction — part 388

CYLINDER HEAD

EM-215

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CYLINDER HEAD

Exploded View

INFOID:0000000006247093

Removal and Installation

INFOID:0000000006247094

REMOVAL

1. Remove the engine assembly from the vehicle. Refer to

EM-225, "Removal and Installation"

.

2. Remove the following components and related parts:

• Drive belt auto tensioner drive belts and idler pulley. Refer to

EM-154, "Drive Belt Auto Tensioner and

Idler Pulley"

.

• Generator assembly and bracket. Refer to

CHG-21, "Removal and Installation"

.

• Thermostat housing and hose. Refer to

CO-57, "Removal and Installation"

.

•

EM-173, "Removal and Installation"

.

• Fuel tube and fuel injector assembly. Refer to

EM-181, "Removal and Installation"

.

• Intake manifold. Refer to

EM-166, "Removal and Installation"

.

• Rocker covers. Refer to

EM-179, "Removal and Installation"

.

• Starter. Refer to

STR-25, "VQ40DE : Removal and Installation"

.

• Knock sensors. Refer to

EM-229, "Exploded View"

.

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

EM-195, "Removal and

Installation"

.

4. Remove the camshaft sprockets and camshafts. Refer to

EM-200, "Removal and Installation"

.

5. Remove the cylinder head bolts in reverse of order shown using

suitable tool.

INSPECTION AFTER REMOVAL

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

2011 Pathfinder

EM-216

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CYLINDER HEAD

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 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 engine, check oil/fluid levels including engine coolant and engine oil. If less than required

quantity, fill to the specified level. Refer to

MA-18, "FOR USA AND CANADA : Fluids and Lubricants"

(United

States and Canada).

• Use procedure below to check for fuel leakage.

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

age at 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 oils/fluids including

engine oil and engine coolant.

Limit (d1 - d2)

: 0.23 mm (0.0091 in)

KBIA0189E

PBIC0068E

Step a : 44.1 N·m (4.5 kg-m, 33 ft-lb)
Step b : 70

°

clockwise

Step c : Loosen in the reverse order of tightening
Step d : 44.1 N·m (4.5 kg-m, 33 ft-lb)
Step e : 60

°

clockwise

Step f

: 60

°

clockwise

Tool number

: KV10112100 (BT-8653-A)

WBIA0603E

2011 Pathfinder

CYLINDER HEAD

EM-217

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

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

ified level, if necessary.

• Summary of the inspection items:

*Power steering fluid, brake fluid, etc.

Exploded View

INFOID:0000000006247095

Disassembly and Assembly

INFOID:0000000006247096

DISASSEMBLY

1. Remove the spark plug. Refer to

EM-156, "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

Transmission/
transaxle fluid

A/T and CVT Models

Leakage

Level/Leakage

Leakage

M/T Models

Level/Leakage

Leakage

Level/Leakage

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

2011 Pathfinder

EM-218

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CYLINDER HEAD

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-219, "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-219, "Inspection After Disassembly"

.

9. Replace the valve guide if necessary. Refer to

EM-219, "Inspection After Disassembly"

.

10. Remove the spark plug tube, if 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-219, "Inspection After Disassembly"

.

2. Install the valve seat if necessary. Refer to

EM-219, "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

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CYLINDER HEAD

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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-219, "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-14, "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:0000000006247097

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”

:38.400 - 39.400 mm
(1.512 - 1.551 in)

KBIA1248E

2011 Pathfinder

EM-220

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CYLINDER HEAD

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-255, "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)

2011 Pathfinder

CYLINDER HEAD

EM-221

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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

2011 Pathfinder

EM-222

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CYLINDER HEAD

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

as shown.

WARNING:

Cylinder head contains heat. When working, wear protec-

tive equipment to avoid getting burned.

6. Ream the cylinder head valve guide using suitable tool.

VALVE SEAT CONTACT

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

are within specifications, perform this procedure.

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

the 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 the valve fit and check again. If the contacting

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

valve seat.

VALVE SEAT REPLACEMENT

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

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

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

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

• This will enable valve seat to fit correctly.

KBIA2530E

Valve guide hole diameter:

Intake and exhaust : 6.000 - 6.018 mm (0.2362

- 0.2369 in)

SEM932C

SBIA0322E

Oversize [0.5 mm (0.020 in)] (Service):

Intake

: 38.500 - 38.516 mm (1.5157 - 1.5164 in)

Exhaust

: 32.700 - 32.716 mm (1.2874 - 1.2880 in)

SEM795A

2011 Pathfinder