Nissan Pathfinder (2007 year). Manual - part 243

CYLINDER HEAD

EM-101

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2007 Pathfinder

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.

CAUTION:

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

6.

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-101, "VALVE SEAT REPLACE-

MENT"

 .

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-138, "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

EM-102

CYLINDER HEAD

2007 Pathfinder

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.

CAUTION:

●

Avoid directly touching cold valve seats.

●

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

5.

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

EM-138, "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. 

6.

Using compound, grind to adjust valve fitting. 

7.

Check again for normal contact. Refer to 

EM-101, "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

CYLINDER HEAD

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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

EM-104

ENGINE ASSEMBLY

2007 Pathfinder

ENGINE ASSEMBLY

PFP:10001

Removal and Installation

EBS00QC9

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.

1.

Rear engine mounting insulator 4x4

2. Rear engine mounting insulator 4x2

3.

LH engine mounting bracket (upper)

4.

LH heat shield plate

5. LH engine mounting insulator

6.

LH engine mounting bracket (lower)

7.

RH engine mounting bracket (lower)

8. RH engine mounting insulator (upper) 9.

RH heat shield plate

10. RH engine mounting bracket (upper)

LBIA0432E

ENGINE ASSEMBLY

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2007 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-42, "Garage Jack and

Safety Stand"

 .

REMOVAL
Preparation

1.

Drain engine coolant. Refer to 

CO-10, "DRAINING ENGINE COOLANT"

 .

2.

Partially drain A/T fluid. Refer to 

AT-14, "Changing the A/T Fluid (ATF)"

 .

3.

Release fuel pressure. Refer to 

EC-79, "FUEL PRESSURE RELEASE"

 .

4.

Remove the engine hood. Refer to 

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

 .

5.

Remove engine room cover using power tools.

6.

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

EM-16, "REMOVAL"

 .

7.

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

8.

Remove the radiator assembly and hoses. Refer to 

CO-14, "REMOVAL"

 .

9.

Remove the drive belts. Refer to 

EM-14, "Removal"

 . 

10. Remove the engine cooling fan. Refer to 

CO-17, "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-21, "REMOVAL"

 . 

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

ATC-162, "REMOVAL"

  (ATC) or 

MTC-102,

"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-35, "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-13, "REMOVAL"

 .

22. Remove three way catalyst. Refer to 

EM-22, "Removal and Installation"

 .

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

24. Remove transmission. Refer to 

AT-240, "Removal and Installa-

tion (2WD)"

  or 

AT-243, "Removal and Installation (4WD)"

 .

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.

a.

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

EM-106

ENGINE ASSEMBLY

2007 Pathfinder

●

Loosen bolts diagonally.

CAUTION:

●

Be careful not to damage drive plate. Especially avoid
deforming and damaging of signal plate teeth (circum-
ference position).

●

Place the drive plate with signal plate surface facing
other than downward.

●

Keep magnetic materials away from signal plate.

CAUTION:

Use an engine stand that has a load capacity [approximately 240kg (529 lb) or more] large enough
for supporting the engine weight. 

●

If the load capacity of the stand is not adequate, remove the following parts beforehand to
reduce the potential risk of overturning the stand.

–

Remove fuel tube and fuel injector assembly. Refer to 

EM-35, "REMOVAL"

 .

–

Remove intake manifold. Refer to 

EM-20, "REMOVAL"

 . 

–

Remove rocker cover. Refer to 

EM-41, "Removal and Installation"

 .

–

Other removable brackets.

CAUTION:

Before removing the hanging chains, make sure the engine stand is stable and there is no risk of
overturning.

28. Remove alternator. Refer to 

SC-31, "REMOVAL"

 .

29. Remove engine mounting insulator bracket (upper) with power tool.

INSTALLATION

Installation is in the reverse order of removal.

INSPECTION AFTER INSTALLATION

●

Before starting engine, check the levels of engine coolant, engine oil and working fluid. If less than
required quantity, fill to the specified level.

●

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 engine coolant, engine oil, working fluid,
fuel and exhaust gas.

●

Bleed air from passages in pipes and tubes of applicable lines, such as in cooling system.

●

After cooling down engine, again check amounts of engine coolant, engine oil and working fluid. Refill to
specified level, if necessary.

●

Summary of the inspection items:

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

KBIA2491E

Item

Before starting engine

Engine running

After engine stopped

Engine coolant

Level

Leakage

Level

Engine oil

Level

Leakage

Level

Working fluid

Level

Leakage

Level

Fuel

Leakage

Leakage

Leakage

Exhaust gas

—

Leakage

—

CYLINDER BLOCK

EM-107

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CYLINDER BLOCK

PFP:11010

Disassembly and Assembly

EBS00QCA

1.

Reinforcement plate

2.

Drive plate (A/T models)

3.

Rear oil seal

4.

Sub harness

5.

Knock sensor

6.

Water connector

7.

Cylinder block

8.

Oil jet

9.

Thrust bearing

10. Pilot converter (A/T models)

11. Main bearing

12. Crankshaft

13. Crankshaft key

14. Lower cylinder block

15. Lower cylinder block bolt

16. Connecting rod bolt

17. Connecting rod bearing cap

18. Connecting rod bearing

19. Connecting rod

20. Snap ring

21. Piston pin

22. Piston

23. Oil ring

24. Second ring

25. Top ring

WBIA0582E

EM-108

CYLINDER BLOCK

2007 Pathfinder

DISASSEMBLY

1.

Remove engine assembly from vehicle. Refer to 

EM-105, "REMOVAL"

 .

2.

Remove both exhaust manifolds. Refer to 

EM-22, "Removal and Installation"

 .

3.

Lift engine, and mount it onto engine stand.

1.

Cylinder block

2.

Gasket

3.

Cylinder block heater

4.

Connector protector cap

PBIC2936E

PBIC0805E