Nissan Pathfinder (2008 year). Manual - part 383

ENGINE UNIT

EM-227

< DISASSEMBLY AND ASSEMBLY >

[VK56DE]

Install main bearing caps.
• Align the identification number to the journal position to install.
• Install it with the front mark (indicated by the arrow) facing the

front of engine.

• Tap caps lightly to seat them in the installation position.

Follow the steps below to tighten each main bearing cap bolt.

Apply engine oil to threads and seating surfaces of bolts, and
tighten all bolts temporarily.

Measure tightening angle using Tool.

CAUTION:

Measure tightening angle using Tool. Do not measure visu-
ally.

• Rotate crankshaft by hand after bolts are tightened. Check if it rotates smoothly.
• Check crankshaft side clearance. Refer to

EM-230, "Inspection After Disassembly"

Install rear oil seal to rear oil seal retainer.
• Install new rear oil seal in the direction shown.

KBIA2533E

Main bearing cap bolts in
order of 1 to 10

: 39.2 N·m (4.0 kg-m, 29 ft.-lb)

Main bearing cap sub
bolts in order of 11 to 20

: 29.4 N·m (3.0 kg-m, 22 ft-lb)

PBIC0090E

Tool number

: KV10112100 (BT-8653-A)

Main bearing cap bolts in
order of 1 to 10

: 40

Main bearing cap sub bolts
in order of 11 to 20

: 30

Side bolts in order of 21 to
30

: 49 N·m (5.0 kg-m, 36 ft-lb)

WBIA0597E

SEM715A

EM-228

< DISASSEMBLY AND ASSEMBLY >

[VK56DE]

ENGINE UNIT

• Tap the rear oil seal until it is level with the rear end surface of

rear oil seal retainer.

CAUTION:

Do not damage or scratch outer circumference of oil seal.

Install rear oil seal retainer.
• Apply liquid gasket thoroughly to rear oil seal retainer as

shown.
Use Genuine RTV Silicone Sealant or equivalent. Refer to

• Apply new engine oil on the lips of rear oil seal. Do not touch.

10. Install the piston to the connecting rod.

Install the snap ring to the grooves of the piston rear side.
• Insert it fully into the groove to install.

Install the piston to the connecting rod.
• Heat piston until piston pin can be pushed in by hand without excess force [approx. 60

to 70 C

(140

158

F)]. From the front to the rear, insert the piston pin into the piston and the connecting rod.

• Assemble so that the front mark on the piston crown and the

oil holes and cylinder No. on the connecting rod are positioned
as shown.

Install the snap ring to the grooves of the piston front side.
• Insert it fully into the groove to install.
• After installing, make sure connecting rod moves smoothly.

11. Install piston rings.

CAUTION:

Do not damage piston.
• Position each ring with the gap as shown, referring to the pis-

ton front mark.

• Install the second ring with the stamped surface facing

upward.

PBIC0097E

SBIA0391E

KBIA2534E

Stamped mark

Second ring

: 2N

PBIC0100E

ENGINE UNIT

EM-229

< DISASSEMBLY AND ASSEMBLY >

[VK56DE]

12. Install the connecting rod bearings to the connecting rod and

connecting rod cap.
• When installing the connecting rod bearings, apply engine oil

to the bearing surface (inside). Do not apply oil to the back
surface, but thoroughly clean it.

• When installing, align the connecting rod bearing stopper pro-

trusion with the cutout of the connecting rod to install.

• Check that the oil holes on the connecting rod and those on

the corresponding bearing are aligned.

13. Install the piston and connecting rod assembly to the crankshaft

using Tool.

• Position the crankshaft pin corresponding to the connecting

rod to be installed onto bottom dead center.

• Apply engine oil sufficiently to the cylinder bore, piston, and

crankshaft pin.

• Match the cylinder position with the cylinder No. on the con-

necting rod to install.

• Install the piston with the front mark on the piston crown facing

the front of the engine.

CAUTION:

Be careful not to damage the crankshaft pin, resulting from an interference of the connecting rod
big end.

14. Install connecting rod cap.

• Match the stamped cylinder number marks on the connecting

rod with those on the cylinder cap to install.

15. Tighten connecting rod bolts using Tool.

• Apply engine oil to threads and seats of connecting rod bolts.
• After tightening bolts, make sure the crankshaft rotates

smoothly.

• Check connecting rod side clearance. Refer to

EM-230,

"Inspection After Disassembly"

PBIC0266E

Tool number

: EM03470000 (J-8037)

WBIA0626E

KBIA2536E

Tool number

: KV10112100 (BT-8653-A)

Connecting rod bolts

Step 1

: 19.6 N·m (1.5 kg-m, 11 ft-lb)

Step 2

: 90

clockwise

WBIA0627E

EM-230

< DISASSEMBLY AND ASSEMBLY >

[VK56DE]

ENGINE UNIT

16. Install knock sensors.

CAUTION:

If knock sensor is dropped, replace it with a new one.
• Make sure that there is no foreign material on the cylinder

block mating surface and the back surface of knock sensor.

• Install it with its connector facing the center of the cylinder

block side.

• Do not tighten knock sensor bolts while holding connector.
• Make sure knock sensor does not interfere with other parts.

• Position the sub-harness as shown before installing intake

manifold.

17. Installation of the remaining components is in the reverse order of removal.
18. Remove engine assembly from engine stand.

19. Install drive plate.

• Align dowel pin of crankshaft rear end with pin holes of each

part to install.

• Install drive plate, reinforcement plate and pilot converter (if

not installed in step 4) as shown.

• Face the chamfered or rounded edge side to the crankshaft.

Inspection After Disassembly

INFOID:0000000001282040

CRANKSHAFT END PLAY

KBIA2493E

KBIA2549E

KBIA2494E

KBIA2537E

ENGINE UNIT

EM-231

< DISASSEMBLY AND ASSEMBLY >

[VK56DE]

• Move the crankshaft fully forward and backward and measure the

clearance between the thrust bearings and crankshaft arm using
suitable tool.

• If measured value exceeds the repair limit, replace the thrust bear-

ings, and measure again. If it still exceeds the repair limit, replace
crankshaft also.

CONNECTING ROD SIDE CLEARANCE

• Measure side clearance between the connecting rod and crank-

shaft arm using suitable tool.

• If measured value exceeds the repair limit, replace the connecting

rod bearings, and measure again. If it still exceeds the repair limit,
replace the crankshaft also.

PISTON AND PISTON PIN CLEARANCE

Piston Pin Hole Diameter

• Measure diameter of piston pin hole using suitable tool.

Piston Pin Outer Diameter

• Measure diameter of piston pin using suitable tool.

Piston to Piston Pin Clearance

Standard

: 0.10 - 0.26 mm (0.0039 - 0.0102 in)

Limit

: 0.30 mm (0.0118 in)

PBIC0114E

Standard

: 0.20 - 0.40 mm (0.0079 - 0.0157 in)

Limit

: 0.40 mm (0.0157 in)

PBIC0115E

Standard

: 21.993 - 21.999 mm (0.8659 - 0.8661 in)

PBIC0116E

Standard

: 21.989 - 21.995 mm (0.8657 - 0.8659 in)

PBIC0117E

EM-232

< DISASSEMBLY AND ASSEMBLY >

[VK56DE]

ENGINE UNIT

(Piston pin clearance) = (Piston pin hole diameter) – (Piston pin
diameter)

• If clearance exceeds specification, replace either or both the pis-

ton/piston pin assembly and the connecting rod assembly with ref-
erence to the specification of each part.

• Use the piston selection table to replace piston/piston pin assem-

bly. Refer to

EM-241, "How to Select Piston and Bearing"

• Use the connecting rod bearing selection table to replace connect-

ing rod. Refer to

EM-241, "How to Select Piston and Bearing"

NOTE:
The connecting rod small end grade and piston pin hole (piston
pin) grade are provided only for the parts installed at the plant. For
service parts, no grades can be selected (only 0 grade is avail-
able).

• Follow the "CONNECTING ROD BUSHING OIL CLEARANCE

(SMALL END)" procedure for the values for each grade at the
plant.

PISTON RING SIDE CLEARANCE

• Measure side clearance of the piston ring and piston ring groove

using suitable tool.

• If out of specification, replace piston and/or piston ring assembly.

PISTON RING END GAP

• Check if the diameter of the cylinder bore is within specification.

Follow the "Piston to Cylinder Bore Clearance" procedure.

• Insert the piston ring into the middle of the cylinder using the pis-

ton, and measure the gap.

• If out of specification, replace piston ring. If the gap still exceeds the limit even with a new ring, re-bore the

cylinder and use oversized piston and piston ring.

Standard

: 0.002 - 0.006 mm (0.0001 - 0.0002 in)

KBIA2496E

KBIA2536E

Standard:

Top ring

: 0.035 - 0.085 mm (0.0014 - 0.0033 in)

2nd ring

: 0.030 - 0.070 mm (0.0012 - 0.0028 in)

Oil ring

: 0.015 - 0.050 mm (0.0006 - 0.0020 in)

Limit:

Top ring

: 0.11 mm (0.0043 in)

2nd ring

: 0.10 mm (0.0039 in)

SEM024AA

Standard

Top ring

: 0.23 - 0.33 mm (0.0091 - 0.0130 in)

2nd ring

: 0.25 - 0.40 mm (0.0098 - 0.0157 in)

Oil ring

: 0.20 - 0.60 mm (0.0079 - 0.0236 in)

Limit:

Top ring

: 0.56 mm (0.0220 in)

2nd ring

: 0.52 mm (0.0205 in)

Oil ring

: 0.96 mm (0.0378 in)

PBIC0118E

ENGINE UNIT

EM-233

< DISASSEMBLY AND ASSEMBLY >

[VK56DE]

CONNECTING ROD BEND AND TORSION

• Check connecting rod alignment using suitable tool.

• If measurement exceeds the limit, replace connecting rod assem-

bly.

CONNECTING ROD DIAMETER (BIG END)

• Install the connecting rod cap without the connecting rod bearing

installed. After tightening the connecting rod bolt to the specified
torque, measure the connecting rod large end inside diameter.
Refer to

EM-222, "Disassembly and Assembly"

• If measurement exceeds the standard, replace connecting rod.

CONNECTING ROD BUSHING OIL CLEARANCE (SMALL END)

Connecting Rod Inside Diameter (Small End)

• Measure inside diameter of connecting rod bushing using suitable

tool.

Piston Pin Diameter

Limit:

Bend

: 0.15 mm (0.0059 in) per 100 mm (3.94 in) length

Torsion

: 0.30 mm (0.0118 in) per 100 mm (3.94 in) length

SEM003F

SEM038F

Standard

: 57.000 - 57.013 mm (2.2441 - 2.2446 in)

PBIC1641E

Standard

: 22.000 - 22.006 mm (0.8661 - 0.8664 in)

PBIC0120E

EM-234

< DISASSEMBLY AND ASSEMBLY >

[VK56DE]

ENGINE UNIT

• Measure diameter of piston pin using suitable tool.

Connecting Rod Bushing Oil Clearance (Small End)

(Connecting rod small end oil clearance) = (Inside diameter of con-
necting rod small end) – (Piston pin diameter)

• If measured value exceeds the standard, replace the connecting

rod assembly and/or piston and piston pin assembly.

• If replacing the piston and piston pin assembly, use the Table for

Selective Fitting for Piston to select the piston corresponding to the
applicable bore grade of the cylinder block to be used. Refer to

EM-241, "How to Select Piston and Bearing"

Factory installed parts grading:
• Only grade 0 is available.

Unit: mm (in)

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 the engine oil or engine coolant passages.

• Measure block upper face for distortion in six directions as shown.

• If measurement exceeds the limit, replace cylinder block.

MAIN BEARING HOUSING INSIDE DIAMETER

Standard

: 21.989 - 21.995 mm (0.8657 - 0.8659 in)

PBIC0117E

Standard

: 0.005 - 0.017 mm (0.0002 - 0.0007 in)

KBIA2536E

Grade

Connecting rod bushing inside diameter

22.000 - 22.006

(0.8661 - 0.8664)

Piston pin diameter

21.989 - 21.995

(0.8657 - 0.8659)

Piston pin hole diameter

21.993 - 21.999

(0.8659 - 0.8661)

KBIA2496E

Standard

: 0.03 mm (0.0012 in)

Limit

: 0.1 mm (0.004 in)

SEM123C

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