Nissan Pathfinder (2007 year). Manual - part 242

CYLINDER HEAD

EM-93

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2007 Pathfinder

●

If compression pressure is below minimum value, check valve clearances and parts associated with
combustion chamber (valve, valve seat, piston, piston ring, cylinder bore, cylinder head, cylinder head
gasket). After the checking, measure compression pressure again.

●

If some cylinders have low compression pressure, pour small amount of engine oil into the spark plug
hole of the cylinder to re-check it for compression.

●

If the added engine oil improves the compression, piston rings may be worn out or damaged. Check the
piston rings and replace if necessary.

●

If the compression pressure remains at low level despite the addition of engine oil, valves may be mal-
functioning. Check valves for damage. Replace valve or valve seat accordingly.

●

If two adjacent cylinders have respectively low compression pressure and their compression remains
low even after the addition of engine oil, cylinder head gaskets are leaking. In such a case, replace cyl-
inder head gaskets.

9.

After inspection is completed, install removed parts.

10. Start engine, and make sure that engine runs smoothly.

11. Perform trouble diagnosis. If DTC appears, erase it. Refer to 

EC-82, "TROUBLE DIAGNOSIS"

 .

Removal and Installation

EBS00QC6

REMOVAL

1.

Remove camshaft. Refer to 

EM-76, "REMOVAL"

 .

2.

Remove intake manifold. Refer to 

EM-20, "REMOVAL"

 .

3.

Remove exhaust manifold. Refer to 

EM-22, "Removal and Installation"

 .

4.

Remove water inlet and thermostat assembly. Refer to 

CO-24, "REMOVAL"

 .

5.

Remove water outlet, water pipe and heater pipe. Refer to 

CO-26, "REMOVAL"

 .

1.

Rubber plug

2.

Cylinder head (left bank)

3.

Cylinder head bolt

4.

Cylinder head (right bank)

5.

Harness bracket

6.

Cylinder head gasket (right bank)

7.

Cylinder head gasket (left bank)

PBIC2934E

EM-94

CYLINDER HEAD

2007 Pathfinder

6.

Remove cylinder head bolts in reverse order as shown using
commercial service tool and power tool to remove cylinder
heads (right and left banks).

7.

Remove cylinder head gaskets.

INSPECTION AFTER REMOVAL
Cylinder Head Bolts Outer Diameter

●

Cylinder head bolts are tightened by plastic zone tightening
method. Whenever the size difference between “d1” and “d2”
exceeds the limit, replace them with new one. 

●

If reduction of outer diameter appears in a position other than
“d2”, use it as “d2” point.

Cylinder Head Distortion

NOTE:
When performing this inspection, cylinder block distortion should be also checked. Refer to 

EM-126, "CYLIN-

DER BLOCK DISTORTION"

 .

1.

Using suitable tool, wipe off oil, scale, gasket, sealant and carbon deposits from surface of cylinder head.

CAUTION:

Do not allow gasket fragments to enter engine oil or engine coolant passages.

2.

At each of several locations on bottom surface of cylinder head,
measure the distortion in six directions.

●

If it exceeds the limit, replace cylinder head.

Tool number

: (J-24239-01)

PBIC2057E

Limit (“d1” – “d2”)

: 0.11 mm (0.0043 in)

PBIC2480E

Limit

: 0.1 mm (0.004 in)

SEM861E

CYLINDER HEAD

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2007 Pathfinder

INSTALLATION

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-94, "Cylinder Head Bolts

Outer Diameter"

 .

SEM532G

Step a

: 98 N·m (10 kg-m, 72 ft-lb) 

Step b

: Loosen to 0 N·m in the reverse order of 
tightening.

Step c

: 39.2 N·m (4.0 kg-m, 29 ft-lb)

Step d

: 90

°

 clockwise

Step e

: 90

°

 clockwise

PBIC2057E

WBIA0581E

EM-96

CYLINDER HEAD

2007 Pathfinder

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
Inspection for Leaks

The following are procedures for checking fluid leaks, lubricant leaks and exhaust gases leaks.

●

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-11, "RECOMMENDED FLUIDS AND LUBRICANTS"

 .

●

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
leakage 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.

●

Warm up engine thoroughly to make sure there is no leakage of fuel, exhaust gases, or any oil/fluids
including engine oil and engine coolant.

●

Bleed air from lines and hoses of applicable lines, such as in cooling system.

●

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

Level

Leakage

Level

Fuel

Leakage

Leakage

Leakage

Exhaust gases

—

Leakage

—

CYLINDER HEAD

EM-97

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2007 Pathfinder

Disassembly and Assembly

EBS00QC7

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.

1.

Valve lifter

2.

Valve collet

3.

Valve spring retainer

4.

Valve spring

5.

Valve oil seal

6.

Valve spring seat

7.

Valve guide

8.

Spark plug

9.

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-A)

: KV10115900 (J-26336-20)

WBIA0578E

EM-98

CYLINDER HEAD

2007 Pathfinder

6.

Remove valve oil seals using Tool.

7.

If valve seat must be replaced, refer to 

EM-101, "VALVE SEAT REPLACEMENT"

 .

8.

If valve guide must be replaced, refer to 

EM-100, "VALVE GUIDE REPLACEMENT"

 .

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-100, "VALVE GUIDE REPLACEMENT"

 .

2.

When valve seat is removed, install it. Refer to 

EM-101, "VALVE SEAT REPLACEMENT"

 .

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).

●

Intake side and exhaust side valve springs are different.
Install them referring to the following paint mark collar.

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

Paint mark collar

Intake

: White

Exhaust

: White

SEM085D

CYLINDER HEAD

EM-99

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2007 Pathfinder

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-47, "Recommended Chemi-

cal Products and Sealants"

 .

c.

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

EBS00QC8

VALVE DIMENSIONS

●

Check dimensions of each valve. For dimensions, refer to 

EM-99, "VALVE DIMENSIONS"

 .

●

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

EM-101,

"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-A)

: 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

EM-100

CYLINDER HEAD

2007 Pathfinder

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. When valve guide must be
replaced, refer to 

EM-100, "VALVE GUIDE REPLACEMENT"

 .

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

°

C

(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 valve guide drift
(commercial service tool).

CAUTION:

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

3.

Ream cylinder head valve guide hole; using suitable reamer.

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