Nissan Pathfinder (2010 year). Manual — part 385

EM-208

< ON-VEHICLE REPAIR >

[VK56DE]

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-208, "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:0000000005260532

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

2010 Pathfinder

CYLINDER HEAD

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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-244, "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)

2010 Pathfinder

EM-210

< ON-VEHICLE REPAIR >

[VK56DE]

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

2010 Pathfinder

CYLINDER HEAD

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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

2010 Pathfinder

EM-212

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[VK56DE]

CYLINDER HEAD

3. Heat the cylinder head to 110

°

to 130

°

C (230

°

to 266

°

F) by

soaking it in heated oil.

4. Cool the valve seats well with dry ice. Force fit the valve seat into the cylinder head.

WARNING:

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

CAUTION:

• Avoid directly touching cold valve seats.

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

Refer to

EM-244, "Standard and Limit"

.

CAUTION:

When using valve seat cutter, firmly grip the cutter handle

with both hands. Then, press on the contacting surface all

around the circumference to cut in a single drive. Improper

pressure on the cutter or cutting many different times may

result in stage valve seat.

6. Grind to obtain the dimensions indicated as shown.

• Using compound, grind to adjust valve fitting.

7. Check again for normal contact.

VALVE SPRING SQUARENESS

SEM008A

SEM934C

KBIA2531E

KBIA2544E

2010 Pathfinder

CYLINDER HEAD

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• Set try square along the side of valve spring and rotate the spring.

Measure the maximum clearance between the top face of spring

and try square.

• If measurement is not within specifications, replace the valve

spring.

VALVE SPRING DIMENSIONS AND VALVE SPRING PRESSURE LOAD

• Check the valve spring pressure at the specified spring height.

• If measurement is not within specifications, replace the valve spring.

Limit

: Less than 2.2 mm (0.087 in)

PBIC0080E

Standard:

Intake and exhaust

Free height:

50.58 mm (1.9913 in)

Installation height:

37.0 mm (1.457 in)

Installation pressure:

165.8 - 187.0 N (16.9 -
19.1 kg, 37- 42 lb)

Height during valve open: 28.2 mm (1.110 in)
Load with valve open:

314.8 - 355.0 N (32.1 -
36.2 kg, 71 - 80 lb)

SEM113

2010 Pathfinder

EM-214

< REMOVAL AND INSTALLATION >

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ENGINE ASSEMBLY

REMOVAL AND INSTALLATION

ENGINE ASSEMBLY

Exploded View

INFOID:0000000005260533

Removal and Installation

INFOID:0000000005260534

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.

• 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, follow the applicable procedures.

• 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-29, "Garage Jack and

Safety Stand"

.

REMOVAL

Preparation

1. Release the fuel pressure. Refer to

EC-958, "Fuel Pressure Check"

.

1.

Rear engine mounting insulator

2.

RH heat shield plate

3.

RH engine mounting insulator

4.

RH engine mounting bracket

5.

LH engine mounting insulator

6.

LH engine mounting bracket

7.

LH heat shield plate

A. Refer to installation

Front

AWBIA0863GB

2010 Pathfinder

ENGINE ASSEMBLY

EM-215

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2. Disconnect the battery negative terminal. Refer to

PG-78, "Removal and Installation"

.

3. Remove engine under cover. Refer to

EXT-14, "Removal and Installation"

.

4. Drain the engine coolant. Refer to

CO-40, "Changing Engine Coolant"

.

5. Drain the engine oil. Refer to

LU-25, "Changing Engine Oil"

.

6. Partially drain the A/T fluid. Refer to

TM-157, "Changing the A/T Fluid (ATF)"

.

7. Partially drain the transfer fluid. Refer to

DLN-135, "Replacement"

.

8. Remove the engine hood. Refer to

DLK-191, "Removal and Installation of Hood Assembly"

.

9. Remove the engine room cover using power tool. Refer to

EM-160, "Removal and Installation"

.

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

EM-161, "Removal and Installation"

.

11. Disconnect the vacuum hose between the vehicle and engine and set it aside.
12. Remove the radiator assembly and hoses. Refer to

CO-44, "Removal and Installation"

.

13. Remove the drive belt. Refer to

EM-149, "Removal and Installation"

.

14. Remove the fan blade. Refer to

CO-48, "Removal and Installation (Crankshaft Driven Type)"

.

15. Disconnect the engine room harness from the fuse box and set it aside.
16. Disconnect the ECM.
17. Disconnect the engine room harness from the engine side and set it aside.
18. Disconnect the engine harness grounds.
19. Disconnect the power steering reservoir tank from the engine and move it aside.
20. Disconnect the power steering oil pump from the engine. Move it aside and secure it using suitable wire or

rope. Refer to

ST-24, "Removal and Installation"

.

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

HA-39, "Removal and Installa-

tion for Compressor"

.

22. Disconnect the brake booster vacuum line.
23. Disconnect the EVAP line.
24. Disconnect the fuel hose at the engine side connection. Refer to

EM-176, "Removal and Installation"

.

25. Disconnect the heater hoses at the cowl, and install plugs to avoid leakage of engine coolant.
26. Remove the A/T oil level indicator and indicator tube upper bolts.
27. Remove the front fender protectors. Refer to

EXT-23, "Removal and Installation of Front Fender Protec-

tor"

.

28. Remove the front final drive assembly. Refer to

DLN-387, "Removal and Installation"

.

29. Remove the exhaust manifolds. Refer to

EM-166, "Removal and Installation"

.

30. Remove the A/T. Refer to

TM-195, "4WD : Removal and Installation"

.

31. Install the engine slingers into the left bank cylinder head (A)

and right bank cylinder head (B).

32. Lift using a hoist and secure the engine in position.
33. Remove engine mounting insulator bolts.
34. Remove the engine assembly from the vehicle, avoid interfer-

ence with the vehicle body.

CAUTION:

• Before and during lifting, always check if any harnesses

are left connected.

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

NOTE:

This procedure is described assuming that you use an engine stand mounting to the surface to which the

transmission mounts.

Engine slinger torque:

45.0 N·m (4.6 kg-m, 33 ft-lb)

AWBIA0088ZZ

2010 Pathfinder