Content .. 369 370 371 372 ..

Nissan Pathfinder (2008 year). Manual - part 371

HOW TO SELECT PISTON AND BEARING

EM-131

< DISASSEMBLY AND ASSEMBLY >

[VQ40DE]

Undersize Bearing Usage Guide

• When the specified main bearing oil clearance is not obtained with standard size main bearings, use under-

side (US) bearing.

• When using undersize (US) bearing, measure the main bearing inner diameter with bearing installed, and

grind main journal so that the main bearing oil clearance satisfies the standard.

CAUTION:

In grinding crankshaft main journal to use undersize bearings,
keep the fillet R [1.5 - 1.7 mm (0.059 - 0.067 in)].

Bearing undersize table

Unit: mm (in)

2.500 - 2.503 (0.0984 - 0.0985)

19.9 - 20.1

(0.783 - 0.791)

Black

Grade is the same for
upper and lower bear-
ings.

2.503 - 2.506 (0.0985 - 0.0987)

Brown

2.506 - 2.509 (0.0987 - 0.0988)

Green

2.509 - 2.512 (0.0988 - 0.0989)

Yellow

2.512 - 2.515 (0.0989 - 0.0990)

Blue

2.515 - 2.518 (0.0990 - 0.0991)

Pink

2.518 - 2.521 (0.0991 - 0.0993)

Purple

2.521 - 2.524 (0.0993 - 0.0994)

White

UPR

2.503 - 2.506 (0.0985 - 0.0987)

Brown

Grade is different for
upper and lower bear-
ings.

LWR

2.500 - 2.503 (0.0984 - 0.0985)

Black

UPR

2.506 - 2.509 (0.0987 - 0.0988)

Green

LWR

2.503 - 2.506 (0.0985 - 0.0987)

Brown

UPR

2.509 - 2.512 (0.0988 - 0.0989)

Yellow

LWR

2.506 - 2.509 (0.0987 - 0.0988)

Green

UPR

2.512 - 2.515 (0.0989 - 0.0990)

Blue

LWR

2.509 - 2.512 (0.0988 - 0.0989)

Yellow

UPR

2.515 - 2.518 (0.0990 - 0.0991)

Pink

LWR

2.512 - 2.515 (0.0989 - 0.0990)

Blue

UPR

2.518 - 2.521 (0.0991 - 0.0993)

Purple

LWR

2.515 - 2.518 (0.0990 - 0.0991)

Pink

UPR

2.521 - 2.524 (0.0993 - 0.0994)

White

LWR

2.518 - 2.521 (0.0991 - 0.0993)

Purple

PBIC1908E

Size

Thickness

US 0.25 (0.0098)

2.633 - 2.641 (0.1037 - 0.1040)

EM-132

< SERVICE DATA AND SPECIFICATIONS (SDS)

[VQ40DE]

SERVICE DATA AND SPECIFICATIONS (SDS)

SERVICE DATA AND SPECIFICATIONS (SDS)

Standard and Limit

INFOID:0000000001282000

GENERAL SPECIFICATIONS

DRIVE BELT

INTAKE MANIFOLD COLLECTOR, INTAKE MANIFOLD AND EXHAUST MANIFOLD

Cylinder arrangement

V-6

Displacement

(cu in)

3,954 (241.30)

Bore and stroke

mm (in)

95.5

92.0 (3.76

3.622)

Valve arrangement

DOHC

Firing order

1-2-3-4-5-6

Number of piston rings

Compression

Oil

Number of main bearings

Compression ratio

9.7

Compression pressure kPa

(kg/cm

, psi)/300 rpm

Standard

1,275 (13.0, 185)

Minimum

981 (10.0, 142)

Differential limit between cylinders

98 (1.0, 14)

Cylinder number

Valve timing
(Intake valve timing control - “OFF”)

Unit: degree

244

240

−

SEM713A

PBIC0187E

Tension of drive belts

Auto adjustment by auto tensioner

SERVICE DATA AND SPECIFICATIONS (SDS)

EM-133

< SERVICE DATA AND SPECIFICATIONS (SDS)

[VQ40DE]

Unit: mm (in)

SPARK PLUG

CAMSHAFT AND CAMSHAFT BEARING

Unit: mm (in)

: Total indicator reading

Valve Lifter

Unit: mm (in)

Valve Clearance

Unit: mm (in)

Items

Limit

Surface distortion

Intake manifold

0.1 (0.004)

Exhaust manifold

0.3 (0.012)

Make

NGK

Standard type

DILFR5A-11

Gap (nominal)

1.1 mm (0.043 in)

Items

Standard

Limit

Camshaft journal oil clearance

No. 1

0.045 - 0.086 (0.0018 - 0.0034)

0.15 (0.0059)

No. 2, 3, 4

0.035 - 0.076 (0.0014 - 0.0030)

Camshaft bracket inner diameter

No. 1

26.000 - 26.021 (1.0236 - 1.0244)

—

No. 2, 3, 4

23.500 - 23.521 (0.9252 - 0.9260)

—

Camshaft journal diameter

No. 1

25.935 - 25.955 (1.0211 - 1.0218)

—

No. 2, 3, 4

23.445 - 23.465 (0.9230 - 0.9238)

—

Camshaft end play

0.115 - 0.188 (0.0045 - 0.0074)

0.24 (0.0094)

Camshaft cam height “A”

Intake

45.465 - 45.655 (1.7900 - 1.7974)

45.265 (1.7821)

Exhaust

45.075 - 45.265 (1.7746 - 1.7821)

44.875 (1.7667)

Camshaft runout [TIR*

]

Less than 0.02 mm (0.0008)

0.05 (0.002)

Camshaft sprocket runout [TIR*

]

—

0.15 (0.0059)

SEM671

Items

Standard

Valve lifter outer diameter

33.977 - 33.987 (1.3377 - 1.3381)

Valve lifter hole diameter

34.000 - 34.016 (1.3386 - 1.3392)

Valve lifter clearance

0.013 - 0.039 (0.0005 - 0.0015)

Items

Cold

Hot* (reference data)

Intake

0.26 - 0.34 (0.010 - 0.013)

0.304 - 0.416 (0.012 - 0.016)

Exhaust

0.29 - 0.37 (0.011 - 0.015)

0.308 - 0.432 (0.012 - 0.017)

EM-134

< SERVICE DATA AND SPECIFICATIONS (SDS)

[VQ40DE]

SERVICE DATA AND SPECIFICATIONS (SDS)

*: Approximately 80

C (176

Available Valve Lifter

VQ40DE

Unit: mm (in)

CYLINDER HEAD

Identification (stamped) mark

Thickness

Intake

Exhaust

788U

N788

7.88 (0.3102)

790U

N790

7.90 (0.3110)

792U

N792

7.92 (0.3118)

794U

N794

7.94 (0.3126)

796U

N796

7.96 (0.3134)

798U

N798

7.98 (0.3142)

800U

N800

8.00 (0.3150)

802U

N802

8.02 (0.3157)

804U

N804

8.04 (0.3165)

806U

N806

8.06 (0.3173)

808U

N808

8.08 (0.3181)

810U

N810

8.10 (0.3189)

812U

N812

8.12 (0.3197)

814U

N814

8.14 (0.3205)

816U

N816

8.16 (0.3213)

818U

N818

8.18 (0.3220)

820U

N820

8.20 (0.3228)

822U

N822

8.22 (0.3236)

824U

N824

8.24 (0.3244)

826U

N826

8.26 (0.3252)

828U

N828

8.28 (0.3260)

830U

N830

8.30 (0.3268)

832U N832

8.32

(0.3276)

834U

N834

8.34 (0.3283)

836U

N836

8.36 (0.3291)

838U

—

8.38 (0.3299)

840U

—

8.40 (0.3307)

SEM758G

SERVICE DATA AND SPECIFICATIONS (SDS)

EM-135

< SERVICE DATA AND SPECIFICATIONS (SDS)

[VQ40DE]

Unit: mm (in)

Valve Dimensions

Unit: mm (in)

Valve Guide

Items

Standard

Limit

Head surface distortion

Less than 0.03 (0.0012)

0.1 (0.004)

Normal cylinder head height “H”

126.3 - 126.5 (4.972 - 4.980)

—

PBIC0924E

Valve head diameter “D”

Intake

37.0 - 37.3 (1.4567 - 1.4685)

Exhaust

31.2 - 31.5 (1.228 - 1.240)

Valve length “L”

Intake

96.46 (3.7976)

Exhaust

93.99 (3.7004)

Valve stem diameter “d”

Intake

5.965 - 5.980 (0.2348 - 0.2354)

Exhaust

5.955 - 5.970 (0.2344 - 0.2350)

Valve seat angle “

”

Intake

′

- 45

′

Exhaust

Valve margin “T”

Intake

1.1 (0.043)

Exhaust

1.3 (0.051)

SEM188

EM-136

< SERVICE DATA AND SPECIFICATIONS (SDS)

[VQ40DE]

SERVICE DATA AND SPECIFICATIONS (SDS)

Unit: mm (in)

Valve Seat

Unit: mm (in)

Items

Standard

0.2 (0.008) oversize (Service)

Valve guide

Outer diameter

10.023 - 10.034 (0.3946 - 0.3950)

10.223 - 10.234 (0.4025 - 0.4029)

Inner diameter (Finished size)

6.000 - 6.018 (0.2362 - 0.2369)

Cylinder head valve guide hole diameter

9.975 - 9.996 (0.3927 - 0.3935)

10.175 - 10.196 (0.4006 - 0.4014)

Interference fit of valve guide

0.027 - 0.059 (0.0011 - 0.0023)

Items

Standard

Limit

Valve guide clearance

Intake

0.020 - 0.053 (0.0008 - 0.0021)

0.08 (0.003)

Exhaust

0.030 - 0.063 (0.0012 - 0.0025)

0.09 (0.004)

Projection length “L”

12.6 - 12.8 (0.496 - 0.504)

SEM950E

Items

Standard

Oversize [0.5 (0.020)] (Service)

Cylinder head seat recess diameter “D”

Intake

38.000 - 38.016 (1.4961 - 1.4967)

38.500 - 38.516 (1.5157 - 1.5164)

Exhaust

32.200 - 32.216 (1.2677 - 1.2683)

32.700 - 32.716 (1.2874 - 1.2880)

Valve seat outer diameter “d”

Intake

38.097 - 38.113 (1.4999 - 1.5005)

38.597 - 38.613 (1.5196 - 1.5202)

Exhaust

32.280 - 32.296 (1.2709 - 1.2715)

32.780 - 32.796 (1.2905 - 1.2912)

Valve seat interference fit

Intake

0.081 - 0.113 (0.0032 - 0.0044)

Exhaust

0.064 - 0.096 (0.0025 - 0.0038)

Diameter “d1”*

Intake

35 (1.38)

Exhaust

28.7 (1.130)

Diameter “d2”*

Intake

36.3 - 36.8 (1.429 - 1.449)

Exhaust

30.3 - 30.8 (1.193 - 1.213)

Angle “

1”

Intake

Exhaust

Angle “

2”

Intake

′

- 90

′

Exhaust

′

- 90

′

PBIC2745E

SERVICE DATA AND SPECIFICATIONS (SDS)

EM-137

< SERVICE DATA AND SPECIFICATIONS (SDS)

[VQ40DE]

: Diameter made by intersection point of conic angles “

1” and “

2”

: Diameter made by intersection point of conic angles “

2” and “

3”

: Machining data

Valve Spring

CYLINDER BLOCK

Unit: mm (in)

Angle “

3”

Intake

120

Exhaust

120

Contacting width “W”*

Intake

1.0 - 1.4 (0.039-0.055)

Exhaust

1.2 - 1.6 (0.047-0.063)

Height “h”

Intake

5.9 - 6.0 (0.232 - 0.236)

5.05 - 5.15 (0.1988 - 0.2028)

Exhaust

5.9 - 6.0 (0.232 - 0.236)

4.95 - 5.05 (0.1949 - 0.1988)

Depth “H”

6.0 (0.236)

Free height

mm (in)

47.07 (1.8531)

Pressure

N (kg, lb) at height mm (in)

Installation

166 - 188 (16.9 - 19.2, 37 - 42) at 37.00 (1.4567)

Valve open

373 - 421 (38.0 - 42.9, 84 - 95) at 27.20 (1.0709)

squareness

mm (in)

Limit

2.1 (0.083)

Surface flatness

Standard

Less than 0.03 (0.0012)

Limit

0.1 (0.004)

Main bearing housing inner diameter

Standard

74.993 - 75.017 (2.9525 - 2.9534)

Cylinder bore

Inner diameter

Standard

Grade No. 1

95.500 - 95.510 (3.7598 - 3.7602)

Grade No. 2

95.510 - 95.520 (3.7602 - 3.7606)

Grade No. 3

95.520 - 95.530 (3.7606 - 3.7610)

Out-of-round (Difference between “X” and “Y”)

Limit

0.015 (0.0006)

Taper (Difference between “A” and “C”)

0.01 (0.0004)

PBIC2955E

EM-138

< SERVICE DATA AND SPECIFICATIONS (SDS)

[VQ40DE]

SERVICE DATA AND SPECIFICATIONS (SDS)

PISTON, PISTON RING AND PISTON PIN

Available Piston

Unit: mm (in)

Piston Ring

Unit: mm (in)

Main bearing housing inner diameter (Without bearing)

Grade No. A
Grade No. B
Grade No. C
Grade No. D
Grade No. E
Grade No. F
Grade No. G
Grade No. H
Grade No. J
Grade No. K
Grade No. L
Grade No. M
Grade No. N
Grade No. P
Grade No. R
Grade No. S
Grade No. T
Grade No. U
Grade No. V
Grade No. W
Grade No. X
Grade No. Y
Grade No. 4
Grade No. 7

74.993 - 74.994 (2.9525 - 2.9525)
74.994 - 74.995 (2.9525 - 2.9526)
74.995 - 74.996 (2.9526 - 2.9526)
74.996 - 74.997 (2.9526 - 2.9526)
74.997 - 74.998 (2.9526 - 2.9527)
74.998 - 74.999 (2.9527 - 2.9527)
74.999 - 75.000 (2.9527 - 2.9528)
75.000 - 75.001 (2.9528 - 2.9528)
75.001 - 75.002 (2.9528 - 2.9528)
75.002 - 75.003 (2.9528 - 2.9529)
75.003 - 75.004 (2.9529 - 2.9529)
75.004 - 75.005 (2.9529 - 2.9529)
75.005 - 75.006 (2.9529 - 2.9530)
75.006 - 75.007 (2.9530 - 2.9530)
75.007 - 75.008 (2.9530 - 2.9531)
75.008 - 75.009 (2.9530 - 2.9531)
75.009 - 75.010 (2.9531 - 2.9531)

75.010 - 75.011 (2.9531 - 2.9532)
75.011 - 75.012 (2.9532 - 2.9532)

75.012 - 75.013 (2.9532 - 2.9533)
75.013 - 75.014 (2.9533 - 2.9533)
75.014 - 75.015 (2.9533 - 2.9533)
75.015 - 75.016 (2.9533 - 2.9534)
75.016 - 75.017 (2.9534 - 2.9534)

Difference in inner diameter between cylinders

Standard

Less than 0.03 (0.0012)

Items

Standard

0.20 (0.0079) oversize

Piston skirt diameter “A”

Grade No. 1

95.480 - 95.490 (3.7590 - 3.7594)

—

Grade No. 2

95.490 - 95.500 (3.7594 - 3.7598)

—

Grade No. 3

95.500 - 95.510 (3.7598 - 3.7602)

—

Service

—

95.680 - 95.710 (3.7669 - 3.7681)

Items

Standard

Limit

“a” dimension

43.03 (1.6941)

—

Piston pin hole diameter

Grade No. 0

21.993 - 21.999 (0.8659 - 0.8661)

—

Grade No. 1

21.999 - 22.005 (0.8661 - 0.8663)

—

Piston to cylinder bore clearance

0.010 - 0.030 (0.0004 - 0.0012)

0.08 (0.0031)

SEM882E

Items

Standard

Limit

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