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Nissan Pathfinder (2009 year). Manual - part 383

ENGINE UNIT

EM-121

< DISASSEMBLY AND ASSEMBLY >

[VQ40DE]

• Install connecting rod bearing cap without installing connecting rod

bearing, and tightening connecting rod bolts to the specified
torque. Refer to

EM-108, "Disassembly and Assembly"

for the

tightening procedure.

• Measure the inner diameter of connecting rod big end with inside

micrometer.

• If out of the standard, replace connecting rod assembly.

CONNECTING ROD BUSHING OIL CLEARANCE (SMALL END)

Connecting Rod Bushing Inside Diameter (Small End)

Measure inside diameter of connecting rod bushing using suitable
tool.

Piston Pin Diameter

Measure diameter of piston pin using suitable tool.

Connecting Rod Bushing Oil Clearance (Small End)

(Connecting rod bushing oil clearance) = (Connecting rod bushing inner diameter) – (Piston pin outer diame-
ter)

• If the calculated value exceeds the limit, replace connecting rod assembly and/or piston and piston pin

assembly.

• If replacing piston and piston pin assembly, refer to

EM-129, "How to Select Piston and Bearing"

• If replacing connecting rod assembly, follow the "CONNECTING

ROD BEARING OIL CLEARANCE" procedure to select the con-
necting rod bearing.

Standard

: 57.000 - 57.013 mm (2.2441 - 2.2446 in)

PBIC1641E

Standard

: 22.000 - 22.012 mm (0.8661 - 0.8666 in)

PBIC0120E

Standard

: 21.989 - 22.001 mm (0.8657 - 0.8662 in)

PBIC0117E

Standard

: 0.005 - 0.017 mm (0.0002 - 0.0007 in)

Limit

: 0.030 mm (0.0012 in)

PBIC0809E

2009 Pathfinder

EM-122

< DISASSEMBLY AND ASSEMBLY >

[VQ40DE]

ENGINE UNIT

Factory installed parts grading:

• Only grade “0”.

Unit: mm (in)

*: After installing in connecting rod

CYLINDER BLOCK DISTORTION

• Remove any oil, scale, gasket, sealant and carbon deposits from the cylinder block surface.

CAUTION:

Do not allow any debris to enter engine oil or engine coolant passages.

• Measure the distortion on the cylinder block upper face at some

different points in six directions with straightedge and feeler gauge.

• If it exceeds the limit, replace cylinder block.

MAIN BEARING HOUSING INNER DIAMETER

• Install lower cylinder block without installing main bearings, and

tighten lower cylinder block bolts to the specified torque. Refer to

EM-108, "Disassembly and Assembly"

for the tightening proce-

dure.

• Measure the inner diameter of main bearing housing with bore

gauge.

• If out of the standard, replace cylinder block and lower cylinder

block as assembly.
NOTE:
Cylinder block cannot be replaced as a single part, because it is
machined together with lower cylinder block.

PISTON TO CYLINDER BORE CLEARANCE

Cylinder Bore Inner Diameter

• Using bore gauge, measure cylinder bore for wear, out-of-round

and taper at six different points on each cylinder. (“X” and “Y” direc-
tions at “A”, “B” and “C”) (“X” is in longitudinal direction of engine)

Grade

Connecting rod bushing
inner diameter *

22.000 - 22.006
(0.8661 - 0.8664)

22.006 - 22.012
(0.8664 - 0.8666)

Piston pin hole diameter

21.993 - 21.999
(0.8659 - 0.8661)

21.999 - 22. 005
(0.8661 - 0.8663)

Piston pin outer diameter

21.989 - 21.995
(0.8657- 0.8659)

21.995 - 22.001
(0.8659 - 0.8662)

PBIC2950E

Limit

: 0.1 mm (0.004 in)

SEM123C

Standard

: 74.993 - 75.017 mm (2.9525 - 2.9534 in)

PBIC2012E

Standard inner diameter:

95.500 - 95.530 mm (3.7598 - 3.7610 in)

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

0.015 mm (0.0006 in)

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

0.01 mm (0.0004 in)

PBIC2955E

2009 Pathfinder

ENGINE UNIT

EM-123

< DISASSEMBLY AND ASSEMBLY >

[VQ40DE]

• If the measured value exceeds the limit, or if there are scratches

and/or seizure on the cylinder inner wall, hone or re-bore the inner
wall.

Piston Skirt Diameter

Measure the outer diameter of piston skirt with micrometer.

Piston to Cylinder Bore Clearance

Calculate by piston skirt diameter and cylinder bore inner diameter (direction “X”, position “B”).
(Clearance) = (Cylinder bore inner diameter) – (Piston skirt diameter).

• If the calculated value exceeds the limit, replace piston and piston pin assembly. Refer to

EM-129, "How to

Select Piston and Bearing"

Re-boring Cylinder Bore

Cylinder bore size is determined by adding piston to cylinder bore clearance to piston skirt diameter.

Install lower cylinder block, and tighten to the specified torque. Otherwise, cylinder bores may be distorted
in final assembly.

Cut cylinder bores.
NOTE:
• When any cylinder needs boring, all other cylinders must also be bored.
• Do not cut too much out of cylinder bore at a time. Cut only 0.05 mm (0.0020 in) or so in diameter at a

time.

Hone cylinders to obtain the specified piston to cylinder bore clearance.

Measure the finished cylinder bore for out-of-round and taper.
NOTE:
Measurement should be done after cylinder bore cools down.

CRANKSHAFT MAIN JOURNAL DIAMETER

• Measure the outer diameter of crankshaft main journals with micrometer.

SEM843E

Measure point

: Distance from the top 43.03 mm (1.6941 in)

Standard

: 95.480 - 95.510 mm (3.7590 - 3.7602 in)

PBIC2956E

Standard

: 0.010 - 0.030 mm (0.0004 - 0.0012 in)

Limit

: 0.08 mm (0.0031 in)

Re-bored size calculation: D = A + B – C

where,

D: Bored diameter

A: Piston skirt diameter as measured

B: Piston to cylinder bore clearance (standard value)

C: Honing allowance 0.02 mm (0.0008 in)

2009 Pathfinder

EM-124

< DISASSEMBLY AND ASSEMBLY >

[VQ40DE]

ENGINE UNIT

• If out of the standard, measure the main bearing oil clearance. Then use undersize bearing.

CRANKSHAFT PIN JOURNAL DIAMETER

• Measure the outer diameter of crankshaft pin journal with

micrometer.

• If out of the standard, measure the connecting rod bearing oil

clearance. Then use undersize bearing.

OUT-OF-ROUND AND TAPER OF CRANKSHAFT

• Measure the dimensions at four different points as shown on each

main journal and pin journal with micrometer.

• Out-of-round is indicated by the difference in the dimensions

between (X) and (Y) at (A) and (B).

• Taper is indicated by the difference in the dimensions between (A)

and (B) at (X) and (Y).

• If the measured value exceeds the limit, correct or replace crankshaft.
• If corrected, measure the bearing oil clearance of the corrected main journal and/or pin journal. Then select

the main bearing and/or connecting rod bearing.

CRANKSHAFT RUNOUT

• Place V-block on precise flat table, and support the journals on the

both end of crankshaft.

• Place dial indicator straight up on the No. 3 journal.
• While rotating crankshaft, read the movement of the pointer on dial

indicator. (Total indicator reading)

• If it exceeds the limit, replace crankshaft.

CONNECTING ROD BEARING OIL CLEARANCE

Method by Calculation

Standard

: 69.951 - 69.975 mm (2.7540 - 2.7549 in) dia.

Standard

: 53.956 - 53.974 mm (2.1242 - 2.1250 in) dia.

PBIC0127E

Limit:

Out-of-round [Difference between (X) and (Y)]

: 0.002 mm (0.0001 in)

Taper [Difference between (A) and (B)]

: 0.002 mm (0.0001 in)

SBIA0535E

Standard

: Less than 0.05 mm (0.002 in)

Limit

: 0.10 mm (0.0039 in)

SEM346D

2009 Pathfinder

ENGINE UNIT

EM-125

< DISASSEMBLY AND ASSEMBLY >

[VQ40DE]

• Install connecting rod bearings to connecting rod and cap, and

tighten connecting rod bolts to the specified torque. Refer to

EM-

108, "Disassembly and Assembly"

for the tightening procedure.

• Measure the inner diameter of connecting rod bearing with inside

micrometer.

(Bearing oil clearance) = (Connecting rod bearing inner diameter) –
(Crankshaft pin journal diameter)

• If the calculated value exceeds the limit, select proper connecting rod bearing according to connecting rod

big end diameter and crankshaft pin journal diameter to obtain the specified bearing oil clearance. Refer to

EM-129, "How to Select Piston and Bearing"

Method of Using Plastigage

• Remove oil and dust on crankshaft pin journal and the surfaces of each bearing completely.
• Cut plastigage slightly shorter than the bearing width, and place it in crankshaft axial direction, avoiding oil

holes.

• Install connecting rod bearings to connecting rod and cap, and tighten connecting rod bolts to the specified

torque. Refer to

EM-108, "Disassembly and Assembly"

for the tightening procedure.

CAUTION:

Do not rotate crankshaft.

• Remove connecting rod bearing cap and bearing, and using scale

on plastigage bag, measure the plastigage width.
NOTE:
The procedure when the measured value exceeds the limit is
same as that described in the “Method by Calculation”.

MAIN BEARING OIL CLEARANCE

Method by Calculation

• Install main bearings to cylinder block and lower cylinder block,

and tighten lower cylinder block bolts to the specified torque. Refer
to

EM-108, "Disassembly and Assembly"

for the tightening proce-

dure.

• Measure the inner diameter of main bearing with bore gauge.
(Bearing clearance) = (Main bearing inner diameter) – (Crankshaft
main journal diameter)

• If the calculated value exceeds the limit, select proper main bearing according to main bearing inner diame-

ter and crankshaft main journal diameter to obtain specified bearing oil clearance. Refer to

EM-129, "How to

Select Piston and Bearing"

Method of Using Plastigage

• Remove engine oil and dust on crankshaft main journal and the surfaces of each bearing completely.
• Cut plastigage slightly shorter than the bearing width, and place it in crankshaft axial direction, avoiding oil

holes.

• Install main bearings to cylinder block and lower cylinder block, and tighten lower cylinder block bolts to the

specified torque. Refer to

EM-108, "Disassembly and Assembly"

for the tightening procedure.

CAUTION:

Standard

: 0.034 - 0.059 mm (0.0013 - 0.0023 in) (actu-

al clearance)

Limit

: 0.070 mm (0.0028 in)

PBIC1642E

PBIC1149E

Standard

: 0.035 - 0.045 mm (0.0014 - 0.0018 in)

(actual clearance)

Limit

: 0.065 mm (0.0026 in)

PBIC2204E

2009 Pathfinder

EM-126

< DISASSEMBLY AND ASSEMBLY >

[VQ40DE]

ENGINE UNIT

Do not rotate crankshaft.

• Remove lower cylinder block and bearings, and using scale on

plastigage bag, measure the plastigage width.
NOTE:
The procedure when the measured value exceeds the limit is
same as that described in the “Method by Calculation”.

CRUSH HEIGHT OF MAIN BEARING

• When lower cylinder block is removed after being tightened to the

specified torque with main bearings installed, the tip end of bearing
must protrude. Refer to

EM-108, "Disassembly and Assembly"

for

the tightening procedure.

• If the standard is not met, replace main bearings.

CRUSH HEIGHT OF CONNECTING ROD BEARING

• When connecting rod bearing cap is removed after being tightened

to the specified torque with connecting rod bearings installed, the
tip end of bearing must protrude. Refer to

EM-108, "Disassembly

and Assembly"

for the tightening procedure.

• If the standard is not met, replace connecting rod bearings.

LOWER CYLINDER BLOCK BOLT OUTER DIAMETER

• Measure the outer diameters [(d

, (d

2)]

at two positions as shown.

• If reduction appears in (A) range, regard it as (d

• If it exceeds the limit (large difference in dimensions), replace

lower cylinder block bolt with new one.

CONNECTING ROD BOLT OUTER DIAMETER

PBIC1149E

Standard

: There must be crush height.

SEM502G

Standard

: There must be crush height.

PBIC1646E

Limit [(d

1) - (

)]

: 0.11 mm (0.0051 in)

PBIC0911E

2009 Pathfinder

ENGINE UNIT

EM-127

< DISASSEMBLY AND ASSEMBLY >

[VQ40DE]

• Measure the outer diameter (d) at position shown.
• If the reduction appears in a position other than (d), regard it as (d).

• When (d) exceeds the limit (when it becomes thinner), replace

connecting rod bolt with new one.

DRIVE PLATE

• Check drive plate and signal plate for deformation or cracks.

CAUTION:

• Do not disassemble drive plate.
• Do not place drive plate with signal plate facing down.
• When handling signal plate, take care not to damage or

scratch it.

• Handle signal plate in a manner that prevents it from becom-

ing magnetized.

• If anything is found, replace drive plate.

OIL JET

• Check nozzle for deformation and damage.
• Blow compressed air from nozzle, and check for clogs.
• If it is not satisfied, clean or replace oil jet.

OIL JET RELIEF VALVE

• Using clean plastic stick, press check valve in oil jet relief valve.

Make sure that valve moves smoothly with proper reaction force.

• If it is not satisfied, replace oil jet relief valve.

Dowel Pin Alignment

INFOID:0000000004468092

REMOVAL

Use Tool to lock the drive plate and match mark (A) the drive
plate before removing the drive plate bolts.

CAUTION:

Do not damage the ring gear teeth, or the signal plate teeth
behind the ring gear, when setting Tool.

Limit

: 7.75 mm (0.3051 in)

PBIC0912E

PBIC2938E

EMU0468D

Tool number

—

(J-48761)

ALBIA0522ZZ

2009 Pathfinder

EM-128

< DISASSEMBLY AND ASSEMBLY >

[VQ40DE]

ENGINE UNIT

Remove drive plate.
• Loosen the drive plate bolts in a diagonal order.

CAUTION:

• Never place drive plate with signal plate facing down.
• When handling the signal plate, take care not to damage

or scratch it.

• Handle the signal plate in a manner that prevents it from

becoming magnetized

INSTALLATION

Installation is in the reverse order of removal.
• When installing the drive plate to the crankshaft, use the

match mark (A) as shown to correctly align the crankshaft side
dowel pin to the drive plate side dowel pin hole.

• Install the drive plate and the reinforcement plate in the direc-

tion as shown.

• Tighten the drive plate bolts in a diagonal pattern in two steps. Refer to

EM-108, "Disassembly and

Assembly"

SEM760G

ALBIA0522ZZ

PBIC0910E

2009 Pathfinder

Content .. 381 382 383 384 ..