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Nissan Pathfinder (2005 year). Manual - part 249

CYLINDER HEAD

EM-97

2005 Pathfinder

Remove valve oil seals using Tool.

If valve seat must be replaced, refer to

EM-100, "VALVE SEAT REPLACEMENT"

If valve guide must be replaced, refer to

EM-99, "VALVE GUIDE REPLACEMENT"

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

When valve guide is removed, install it. Refer to

EM-99, "VALVE GUIDE REPLACEMENT"

When valve seat is removed, install it. Refer to

EM-100, "VALVE SEAT REPLACEMENT"

Install valve oil seals using Tool.

Install valve spring seat.

Install valves.

●

Install it in the original position.

NOTE:
Larger diameter valves are for intake side.

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.

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

EM-98

CYLINDER HEAD

2005 Pathfinder

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.

Install valve lifter.

●

Install it in the original position.

10. Install spark plug tube.

●

Press-fit spark plug tube as follows:

Remove old liquid gasket adhering to cylinder head mounting hole.

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-45, "Recommended Chemi-

cal Products and Sealants"

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

EBS00NK6

VALVE DIMENSIONS

●

Check dimensions of each valve. For dimensions, refer to

EM-98, "VALVE DIMENSIONS"

●

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

EM-100,

"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

CYLINDER HEAD

EM-99

2005 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-99, "VALVE GUIDE REPLACEMENT"

VALVE GUIDE REPLACEMENT

When valve guide is removed, replace with oversized [0.2 mm (0.008 in)] valve guide.

To remove valve guide, heat cylinder head to 110

to 130

(230

to 266

F) by soaking in heated oil.

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.

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

EM-100

CYLINDER HEAD

2005 Pathfinder

Heat cylinder head to 110

to 130

C (230

to 266

F) by soaking

in heated oil.

Press valve guide from camshaft side to the dimensions as
shown using suitable tool.

CAUTION:

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

Apply reamer finish to valve guide using suitable reamer.

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 sur-
face.

●

Check if the contact area band is continuous all around the cir-
cumference.

●

If not, grind to adjust valve fitting and check again. If the contact-
ing surface still has “NG” conditions even after the re-check,
replace valve seat. Refer to

EM-100, "VALVE SEAT REPLACE-

MENT"

VALVE SEAT REPLACEMENT

When valve seat is removed, replace with oversized [0.5 mm (0.020 in)] valve seat.

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-137, "Valve Seat"

CAUTION:

Prevent to 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

CYLINDER HEAD

EM-101

2005 Pathfinder

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.

Heat cylinder head to 110

to 130

C (230

to 266

F) by soaking

in heated oil.

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

CAUTION:

●

Avoid directly touching cold valve seats.

●

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

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

EM-137, "Valve Seat"

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 with cutter or cutting many different times may
result in staged valve seat.

Using compound, grind to adjust valve fitting.

Check again for normal contact. Refer to

EM-100, "VALVE SEAT 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.

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

EM-102

CYLINDER HEAD

2005 Pathfinder

VALVE SPRING DIMENSIONS AND VALVE SPRING PRESSURE LOAD

●

Check valve spring pressure at the specified spring height.

●

If the installation load or load with valve open is out of the standard, replace valve spring.

Standard:

Intake and exhaust

Free height

: 47.07 mm (1.8531 in)

Installation height

: 37.00 mm (1.4567 in)

Installation load

: 166 - 188 N (16.9 - 19.2 kg, 37 - 42 lb)

Height during valve open

: 27.20 mm (1.0709 in)

Load with valve open

: 373 - 421 N (38.0 - 42.9 kg, 84 - 95 lb)

SEM113

ENGINE ASSEMBLY

EM-103

2005 Pathfinder

ENGINE ASSEMBLY

PFP:10001

Removal and Installation

EBS00NK7

WARNING:

●

Situate vehicle on a flat and solid surface.

●

Place chocks at front and back of rear wheels.

●

For engines not equipped with engine slingers, attach proper slingers and bolts described in
PARTS CATALOG.

CAUTION:

●

Always be careful to work safely, avoid forceful or uninstructed operations.

Rear engine mounting insulator 4x4

2. Rear engine mounting insulator 4x2

LH engine mounting bracket (upper)

LH heat shield plate

5. LH engine mounting insulator

LH engine mounting bracket (lower)

RH engine mounting bracket (lower)

8. RH engine mounting insulator (upper) 9.

RH heat shield plate

10. RH engine mounting bracket (upper)

LBIA0432E

EM-104

ENGINE ASSEMBLY

2005 Pathfinder

●

Do not start working until exhaust system and engine coolant are cooled sufficiently.

●

If items or work required are not covered by the engine section, refer to the applicable sections.

●

Always use the support point specified for lifting.

●

Use either 2-point lift type or separate type lift. If board-on type is used for unavoidable reasons,
support at the rear axle jacking point with transmission jack or similar tool before starting work, in
preparation for the backward shift of center of gravity.

●

For supporting points for lifting and jacking point at rear axle, refer to

GI-40, "Garage Jack and

Safety Stand"

REMOVAL
Preparation

Drain engine coolant. Refer to

MA-13, "DRAINING ENGINE COOLANT"

Partially drain A/T fluid. Refer to

MA-24, "Changing the Automatic Transmission Fluid (ATF)"

Release fuel pressure. Refer to

EC-91, "FUEL PRESSURE RELEASE"

Remove the engine hood. Refer to

BL-13, "Removal and Installation of Hood Assembly"

Remove engine room cover using power tools.

Remove the air duct and air cleaner case assembly. Refer to

EM-15, "REMOVAL"

Disconnect vacuum hose between vehicle and engine and set it aside.

Remove the radiator assembly and hoses. Refer to

CO-11, "REMOVAL"

Remove the drive belts. Refer to

EM-13, "Removal"

10. Remove the engine cooling fan. Refer to

CO-14, "ENGINE COOLING FAN"

11. Disconnect the engine room harness from the engine side and set it aside for easier work.

12. Disconnect the engine harness grounds.
13. Disconnect the reservoir tank for power steering from engine and move it aside for easier work.

14. Disconnect power steering oil pump from engine. Move it from its location and secure with a rope for eas-

ier work. Refer to

PS-20, "REMOVAL"

15. Remove the A/C compressor bolts and set aside. Refer to

ATC-155, "REMOVAL"

(ATC) or

MTC-100,

"REMOVAL"

(MTC).

16. Disconnect brake booster vacuum line.

17. Disconnect EVAP line.
18. Disconnect the fuel hose at the engine side connection. Refer to

EM-34, "REMOVAL"

19. Disconnect the heater hoses at cowl, and install plugs to avoid leakage of engine coolant.

20. Remove the A/T oil level indicator and indicator tube.

21. Remove front final drive assembly (4x4 only). Refer to

FFD-14, "REMOVAL"

22. Remove three way catalyst. Refer to

EM-21, "Removal and Installation"

23. Install engine slingers into left bank and right bank.

24. Remove transmission. Refer to

AT-245, "Removal and Installa-

tion (4x2)"

AT-249, "Removal and Installation (4x4)"

25. Lift with hoist and secure the engine in position.

26. Remove engine assembly from vehicle, avoiding interference

with vehicle body.

CAUTION:

●

Before and during this lifting, always check if any har-
nesses are left connected.

27. Remove the parts that may restrict installation of engine to engine stand.

NOTE:
The procedure is described assuming that you use a engine holding the surface, to which transmission is
installed.

Remove drive plate.

●

Holding crankshaft pulley bolts, lock crankshaft to remove drive plate bolts.

Engine slinger torque:

28.0 N·m (2.9 kg-m, 21 ft-lb)

WBIA0624E

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