Nissan Pathfinder (2008 year). Manual - part 365

CAMSHAFT

EM-83

< ON-VEHICLE REPAIR >

[VQ40DE]

Remove timing chain tensioner (secondary) from cylinder head.
• Remove timing chain tensioner (secondary) with its stopper

pin attached.

NOTE:
Stopper pin was attached when timing chain (secondary) was
removed.

INSPECTION AFTER REMOVAL

Camshaft Runout

Put V-block on precise flat table, and support No. 2 and 4 journal
of camshaft.

CAUTION:

Do not support journal No. 1 (on the side of camshaft
sprocket) because it has a different diameter from the other
three locations.

Set dial indicator vertically to No. 3 journal.

Turn camshaft to one direction with hands, and measure the
camshaft runout on dial indicator. (Total indicator reading)

If it exceeds the limit, replace camshaft.

Camshaft Cam Height

Measure the camshaft cam height with micrometer.

If wear exceeds the limit, replace camshaft.

Camshaft Journal Oil Clearance

CAMSHAFT JOURNAL DIAMETER

• Measure the outer diameter of camshaft journal with micrometer.

CAMSHAFT BRACKET INNER DIAMETER

• Tighten camshaft bracket bolt with the specified torque.

PBIC2111E

Standard

: Less than 0.02 mm (0.0008 in)

Limit

: 0.05 mm (0.0020 in)

PBIC0929E

Standard:

Intake

: 45.465 - 45.655 mm (1.7900 - 1.7974 in)

Exhaust

: 45.075 - 45.265 mm (1.7746 - 1.7821 in)

Limit:

Intake

: 45.265 mm (1.7821 in)

Exhaust

: 44.875 mm (1.7667 in)

EMQ0072D

Standard:

No. 1

: 25.935 - 25.955 mm (1.0211 - 1.0218 in)

No. 2, 3, 4

: 23.445 - 23.465 mm (0.9230 - 0.9238 in)

PBIC0040E

EM-84

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[VQ40DE]

CAMSHAFT

• Measure the inner diameter “A” of camshaft bracket with bore

gauge.

CAMSHAFT JOURNAL OIL CLEARANCE

• (Oil clearance) = (Camshaft bracket inner diameter) – (Camshaft journal diameter).

• If the calculated value exceeds the limit, replace either or both camshaft and cylinder head.

NOTE:
Camshaft bracket cannot be replaced as a single part, because it is machined together with cylinder head.
Replace whole cylinder head assembly.

Camshaft End Play

• Install dial indicator in thrust direction on front end of camshaft.

Measure the end play of dial indicator when camshaft is moved for-
ward/backward (in direction to axis).

• Measure the following parts if out of the limit.
- Dimension “A” for camshaft No. 1 journal

- Dimension “B” for cylinder head No. 1 journal bearing

• Following the standards above, replace camshaft and/or cylinder

head.

Camshaft Sprocket Runout

Put V-block on precise flat table, and support No. 2 and 4 journal of camshaft.

CAUTION:

Do not support journal No. 1 (on the side of camshaft sprocket) because it has a different diameter
from the other three locations.

Standard:

No. 1

: 26.000 - 26.021 mm (1.0236 - 1.0244 in)

No. 2, 3, 4

: 23.500 - 23.521 mm (0.9252 - 0.9260 in)

PBIC1645E

Standard:

No. 1

: 0.045 - 0.086 mm (0.0018 - 0.0034 in)

No. 2, 3, 4

: 0.035 - 0.076 mm (0.0014 - 0.0030 in)

Limit

: 0.15 mm (0.0059 in)

Standard

: 0.115 - 0.188 mm (0.0045 - 0.0074 in)

Limit

: 0.24 mm (0.0094 in)

SEM864E

Standard

: 27.500 - 27.548 mm (1.0827 - 1.0846 in)

Standard

: 27.360 - 27.385 mm (1.0772 - 1.0781 in)

KBIA2404J

CAMSHAFT

EM-85

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[VQ40DE]

Measure the camshaft sprocket runout with dial indicator. (Total
indicator reading)

• If it exceeds the limit, replace camshaft sprocket.

Valve Lifter

Check if surface of valve lifter has any wear or cracks.
• If anything above is found, replace valve lifter. Refer to

EM-132,

"Standard and Limit"

Valve Lifter Clearance

VALVE LIFTER OUTER DIAMETER

• Measure the outer diameter at 1/2 height of valve lifter with

micrometer since valve lifter is in barrel shape.

VALVE LIFTER HOLE DIAMETER

• Measure the inner diameter of valve lifter hole of cylinder head with

inside micrometer.

VALVE LIFTER CLEARANCE

• (Valve lifter clearance) = (Valve lifter hole diameter) – (Valve lifter outer diameter), Refer to

EM-18, "Valve

Clearance"

Limit

: 0.15 mm (0.0059 in)

PBIC0930E

KBIA0182E

Standard (Intake and exhaust)

: 33.977 - 33.987 mm (1.3377 - 1.3381 in)

JEM798G

Standard (Intake and exhaust)

: 34.000 - 34.016 mm (1.3386 - 1.3392 in)

SEM867E

Standard (Intake and exhaust)

: 0.013 - 0.039 mm (0.0005 - 0.0015 in)

EM-86

< ON-VEHICLE REPAIR >

[VQ40DE]

CAMSHAFT

• If the calculated value is out of the standard, referring to each standard of valve lifter outer diameter and

valve lifter hole diameter, replace either or both valve lifter and cylinder head.

INSTALLATION

Install timing chain tensioners (secondary) on both sides of cyl-
inder head.
• Install timing chain tensioner with its stopper pin attached.
• Install timing chain tensioner with sliding part facing downward

on right-side cylinder head, and with sliding part facing upward
on left-side cylinder head.

• Install new O-rings as shown.

Install valve lifters.
• Install it in the original position.

Install camshafts.
• Install camshaft with dowel pin attached to its front end face on

the exhaust side.

• Follow your identification marks made during removal, or fol-

low the identification marks that are present on new camshafts
for proper placement and direction.

• Install camshaft so that dowel pin hole and dowel pin on front

end face are positioned as shown. (No. 1 cylinder TDC on its
compression stroke)
NOTE:
• Large and small pin holes are located on front end face of

camshaft (INT), at intervals of 180

. Face small dia. side pin

hole upward (in cylinder head upper face direction).

• Though camshaft does not stop at the portion as shown, for

the placement of cam nose, it is generally accepted cam-
shaft is placed for the same direction as shown.

PBIC2111E

KBIA1071E

Bank

INT/EXH

Dowel pin

Paint marks

Identification

mark

INT

Green

EXH

Yes

White

INT

Green

EXH

Yes

White

KBIA1009E

PBIC2478E

CAMSHAFT

EM-87

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[VQ40DE]

Install camshaft brackets.
• Remove foreign material completely from camshaft bracket

backside and from cylinder head installation face.

• Install camshaft bracket in original position and direction as

shown.

• Install camshaft brackets (No. 2 to 4) aligning the stamp marks

as shown.
NOTE:
There are no identification marks indicating left and right for
camshaft bracket (No. 1).

• Apply liquid gasket to mating surface of camshaft bracket (No.

1) as shown on right and left banks.
Use Genuine RTV Silicone Sealant or equivalent. Refer to

PBIC2051E

PBIC2052E

PBIC2660E

EM-88

< ON-VEHICLE REPAIR >

[VQ40DE]

CAMSHAFT

Tighten camshaft bracket bolts in the following steps, in numeri-
cal order as shown.

Measure the difference in levels between front end faces of
camshaft bracket (No. 1) and cylinder head.

• Measure two positions (both intake and exhaust side) for a

single bank.

• If the measured value is out of the standard, re-install cam-

shaft bracket (No. 1).

Check and adjust the valve clearance. Refer to

EM-18, "Valve Clearance"

Installation of the remaining components is in the reverse order of removal.

INSPECTION AFTER INSTALLATION

Inspection of Camshaft Sprocket (INT) Oil Groove

CAUTION:

• Perform this inspection only when DTC P0011 or P0021 are detected in self-diagnostic results of

CONSULT-II and it is directed according to inspection procedure of EC section. Refer to

EC-99, "DTC

Confirmation Procedure"

• Check when engine is cold so as to prevent burns from any splashing engine oil.
1.

Check the engine oil level. Refer to

LU-8, "Inspection"

Perform the following procedure so as to prevent the engine from being unintentionally started while
checking.

Release fuel pressure. Refer to

EC-481, "Fuel Pressure Check"

Disconnect ignition coil and injector harness connectors.

Remove intake valve timing control solenoid valve. Refer to

EM-52, "Removal and Installation"

Camshaft bracket bolts

Step 1 (bolts 7 - 10)

: 1.96 N·m (0.2 kg-m, 17 in-lb)

Step 2 (bolts 1 - 6)

: 1.96 N·m (0.2 kg-m, 17 in-lb)

Step 3

: 5.88 N·m (0.6 kg-m, 52 in-lb)

Step 4

: 10.4 N·m (1.1 kg-m, 92 in-lb)

PBIC2050E

Standard

: –0.14 to 0.14 mm (–0.0055 to 0.0055 in)

EMQ0044D

CAMSHAFT

EM-89

< ON-VEHICLE REPAIR >

[VQ40DE]

Crank the engine, and then make sure that engine oil comes out
from camshaft bracket (No. 1) oil hole. End crank after checking.

WARNING:

Be careful not to touch rotating parts (drive belts, idler pul-
ley, and crankshaft pulley, etc.).

CAUTION:

Engine oil may squirt from intake valve timing control sole-
noid valve installation hole during cranking. Use a shop
cloth to prevent the engine components and the vehicle. Do
not allow engine oil to get on rubber components such as
drive belt or engine mount insulators. Immediately wipe off
any splashed engine oil.

• Clean oil groove between oil strainer and intake valve timing control solenoid valve if engine oil does not

come out from camshaft bracket (No. 1) oil hole. Refer to

LU-7, "Lubrication Circuit"

LU-7, "System Chart"

Remove components between intake valve timing control solenoid valve and camshaft sprocket (INT),
and then check each oil groove for clogging.
• Clean oil groove if necessary. Refer to

LU-7, "Lubrication Circuit"

LU-7, "System Chart"

After inspection, install removed parts.

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-10, "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 leak-

age 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.

NOTE:
If hydraulic pressure inside timing chain tensioner drops after removal/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 gases, or any oil/fluids includ-

ing 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 fluid, power steering fluid, brake fluid, etc.

PBIC2869E

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

EM-90

< ON-VEHICLE REPAIR >

[VQ40DE]

OIL SEAL

OIL SEAL

Removal and Installation of Valve Oil Seal

INFOID:0000000001281989

REMOVAL

Turn crankshaft until the cylinder requiring new oil seals is at TDC. This will prevent valve from dropping
into cylinder.

Remove camshaft relating to valve oil seal to be removed. Refer to

EM-81, "Removal and Installation"

Remove valve lifters. Refer to

EM-81, "Removal and Installation"

Remove valve collet, valve spring retainer and valve spring
using Tool.

CAUTION:

When working, take care not to damage valve lifter holes.

• Compress valve spring using Tool attachment, adapter.

Remove valve collet with magnet hand.

Remove valve oil seal using Tool.

INSTALLATION

Apply new engine oil to new valve oil seal joint surface and seal lip.

Press in valve oil seal to specified height "H" using Tool.

NOTE:
Dimension "H": height measured before valve spring seat instal-
lation.

Installation of the remaining components is in the reverse order
of removal.

Removal and Installation of Front Oil Seal

INFOID:0000000001281990

REMOVAL

Remove engine undercover using power tools.

Remove drive belts. Refer to

EM-13, "Removal and Installation"

Remove engine cooling fan assembly. Refer to

CO-19, "Removal and Installation (Crankshaft driven

type)"

Remove crankshaft pulley. Refer to

EM-61, "Removal and Installation"

Tool numbers

: KV10116200 (J-26336-B)

: KV10115900 (J-26336-20)

: KV10109220 (

—

)

WBIA0578E

Tool number

: KV10107902 (J-38959)

WBIA0489E

Tool number

—

(J-39386)

Intake and exhaust

: 14.3 - 14.9 mm (0.563 - 0.587 in)

WBIA0490E

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