Nissan Pathfinder (2010 year). Instruction — part 370
EM-88
< ON-VEHICLE REPAIR >
[VQ40DE]
CYLINDER HEAD
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
(Cylinder Head Bolts Outer Diameter).
Measure the tightening angle using Tool.
SEM532G
Step a
: 98 N·m (10 kg-m, 72 ft-lb)
Step b
: Loosen to 0 N·m in the reverse order of tight-
ening.
Step c
: 39.2 N·m (4.0 kg-m, 29 ft-lb)
PBIC2057E
Tool number
: KV10112100 (BT-8653-A)
Step d
: 90
°
clockwise
Step e
: 90
°
clockwise
WBIA0581E
2010 Pathfinder
CYLINDER HEAD
EM-89
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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
• Before starting the engine, check oil/fluid levels including engine coolant and engine oil. If the levels are
lower than required quantity, fill to the specified level. Refer to
.
• Use procedure below to check for fuel leakage.
• Turn ignition switch ON (with engine stopped). With fuel pressure applied to the fuel piping, check for fuel
leakage at the 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 oil/fluids including
engine oil and engine coolant.
• Bleed air from passages in lines and hoses, such as in cooling system.
• After cooling down the engine, again check oil/fluid levels including engine oil and engine coolant. Refill to
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 fluids*
Level
Leakage
Level
Fuel
Leakage
Leakage
Leakage
Exhaust gas
—
Leakage
—
2010 Pathfinder
EM-90
< ON-VEHICLE REPAIR >
[VQ40DE]
CYLINDER HEAD
Exploded View
INFOID:0000000005260470
Disassembly and Assembly
INFOID:0000000005260471
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-B)
: KV10115900 (J-26336-20)
WBIA0578E
2010 Pathfinder
CYLINDER HEAD
EM-91
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6. Remove valve oil seals using Tool.
7. If valve seat must be replaced, refer to
EM-92, "Inspection After Disassembly"
8. If valve guide must be replaced, refer to
EM-92, "Inspection After Disassembly"
.
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-92, "Inspection After Disassembly"
2. When valve seat is removed, install it. Refer to
EM-92, "Inspection After Disassembly"
.
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).
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
SEM085D
2010 Pathfinder
EM-92
< ON-VEHICLE REPAIR >
[VQ40DE]
CYLINDER HEAD
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
.
c.
Press-fit spark plug tube so that its height “H” is as specified
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
INFOID:0000000005260472
VALVE DIMENSIONS
• Check dimensions of each valve. For dimensions, refer to
• If dimensions are out of the standard, replace valve and check the 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-B)
: 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
2010 Pathfinder
CYLINDER HEAD
EM-93
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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.
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 suitable tool.
WARNING:
Cylinder head contains heat. When working, wear protec-
tive equipment to avoid getting burned.
3. Ream cylinder head valve guide hole using suitable tool.
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
2010 Pathfinder
EM-94
< ON-VEHICLE REPAIR >
[VQ40DE]
CYLINDER HEAD
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.
WARNING:
Cylinder head contains heat. When working, wear protec-
tive equipment to avoid getting burned.
6. Apply reamer finish to valve guide using suitable tool.
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 surface.
• Check if the contact area band is continuous all around the circum-
ference.
• If not, grind to adjust valve fitting and check again. If the contacting
surface still has “NG” conditions even after the re-check, replace
valve seat.
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
.
CAUTION:
Do not 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
2010 Pathfinder
CYLINDER HEAD
EM-95
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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.
WARNING:
• Cylinder head contains heat. When working, wear protective equipment to avoid getting burned.
CAUTION:
• Avoid directly touching cold valve seats.
5. Finish seat to the specified dimensions using suitable tool. Refer
.
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 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.
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.
VALVE SPRING DIMENSIONS AND VALVE SPRING PRESSURE LOAD
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
2010 Pathfinder
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