Nissan Pathfinder (2008 year). Manual - part 368

ENGINE UNIT

EM-107

< DISASSEMBLY AND ASSEMBLY >

[VQ40DE]

DISASSEMBLY

NOTE:
Explained here is how to disassemble with engine stand supporting transmission surface. When using differ-
ent type of engine stand, some steps may be different.

Remove engine assembly from vehicle. Refer to

EM-103, "Removal and Installation"

Remove both exhaust manifolds. Refer to

EM-31, "Removal and Installation"

Lift engine, and mount to engine stand.

CAUTION:

Before removing the hanging chains, make sure engine
stand is stable and there is no risk of overturning.

Cylinder block

Gasket

Cylinder block heater

Connector protector cap

PBIC2936E

PBIC0805E

EM-108

< DISASSEMBLY AND ASSEMBLY >

[VQ40DE]

ENGINE UNIT

• A widely use engine stand can be used.

CAUTION:

Use engine stand that has a load capacity [approximately
220 kg (441 lb) or more] large enough for supporting the
engine weight.

Drain engine oil. Refer to

LU-9, "Changing Engine Oil"

Drain engine coolant by removing the cylinder block drain plugs
"A", "B", "C" and "D" from cylinder block as shown.
NOTE:
For Canada, “D” is not plug but block heater.

Remove drive plate using Tool.

• Loosen bolts in diagonal order.
• Use TORX socket for drive plate bolts.

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

becoming magnetized.

Remove cylinder head. Refer to

EM-93, "Removal and Installation"

Remove sub harness, and remove knock sensors.

PBIC0085E

WLIA0020E

Tool number

: KV10117700 (J-44716)

PBIC2938E

ENGINE UNIT

EM-109

< DISASSEMBLY AND ASSEMBLY >

[VQ40DE]

CAUTION:

Carefully handle sensor avoiding shocks.

Remove pilot converter using Tool as necessary.

10. Remove piston and connecting rod assembly as follows:

• Before removing piston and connecting rod assembly, check the connecting rod side clearance. Refer to

EM-117, "Inspection After Disassembly"

CAUTION:

Be careful not to drop connecting rod bearing, and to scratch the surface.

11. Position crankshaft pin corresponding to connecting rod to be removed onto the bottom dead center.

12. Remove connecting rod bearing cap.
13. Push piston and connecting rod assembly out to the cylinder

head side using suitable tool.

CAUTION:

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

14. Remove connecting rod bearings from connecting rod and connecting rod bearing cap.

CAUTION:

Identify installation position, and store them without mixing them up.

15. Remove piston rings form piston.

• Before removing piston rings, check the piston ring side clearance. Refer to

EM-117, "Inspection After

Disassembly"

• Remove piston rings using piston ring expander or suitable

tool.

CAUTION:

• When removing piston rings, be careful not to damage

piston.

• Be careful not to damage piston rings by expanding them

excessively.

16. Remove piston from connecting rod as follows:

Tool number

: ST16610001 (J-23907)

WBIA0583E

PBIC2940E

PBIC0087E

EM-110

< DISASSEMBLY AND ASSEMBLY >

[VQ40DE]

ENGINE UNIT

Remove snap ring using snap ring pliers.

Heat piston to 60

to 70

C (140

to 158

F) with industrial use

drier or equivalent.

Push out piston pin with stick of outer diameter approximately 20
mm (0.79 in).

17. Remove lower cylinder block bolts.

• Before loosening lower cylinder block bolts, measure the crankshaft end play. Refer to

EM-117, "Inspec-

tion After Disassembly"

• Loosen lower cylinder block bolts in reverse order as shown in

several different steps.
NOTE:
Use TORX socket (size E14) for bolts No. 1 to 16 (M10 bolt).

18. Remove lower cylinder block.

• Cut liquid gasket for removal. Refer to

EM-5, "Precaution for Liquid Gasket"

CAUTION:

Be careful not to damage the mounting surfaces.

19. Remove crankshaft.

20. Pull rear oil seal out from rear end of crankshaft.

PBIC1638E

PBIC1639E

PBIC0262E

PBIC2941E

Tool number

: KV10111100 (J-37228)

ENGINE UNIT

EM-111

< DISASSEMBLY AND ASSEMBLY >

[VQ40DE]

NOTE:
When replacing rear oil seal without removing lower cylinder block, use a suitable to pull the rear oil seal
installed between crankshaft and cylinder block out.

CAUTION:

Be careful not to damage crankshaft and cylinder block.

21. Remove main bearings and thrust bearings from cylinder block and lower cylinder block.

CAUTION:

• Be careful not to drop main bearing, and to scratch the surface.
• Identify installation positions, and store them without mixing them up.

22. Remove oil jet.

ASSEMBLY

Fully air-blow engine coolant and engine oil passages in cylinder block, cylinder bore and crankcase to
remove any foreign material.

CAUTION:

Use a goggles to protect your eye.

Install each plug to cylinder block as shown.
• Apply sealant to the thread of water drain plugs “A” and “B”.

Use Genuine RTV Silicone Sealant or equivalent. Refer to

• Apply sealant to the thread of plugs “C”.

Use Genuine High Strength Thread Locking Sealant or
equivalent. Refer to

GI-26, "Recommended Chemical

Products and Sealants"

• Apply sealant to the thread of plug “D”.

Use Anaerobic Liquid Gasket or equivalent. Refer to

GI-

NOTE:
For Canada, “D” is not plug but block heater. Refer to

EM-106,

"Disassembly and Assembly"

• Replace washers with new one.

• Tighten each plug as specified below.

Block Plug and Block Heater Installation

Install oil jet.

WLIA0020E

Part

Washer

Tightening Torque

19.6 N·m (2.0 kg-m, 14 ft-lb)

Reuse

9.8 N·m (1.0 kg-m, 87 in-lb)

New

6.0 N·m (0.61 kg-m, 53 in-lb)

Yes

116 N·m (11.8 kg-m, 85 ft-lb)

Plug

Yes

62 N·m (6.3 kg-m, 46 ft-lb)

Block heater

73.5 N·m (7.5 kg-m, 54 ft-lb)

EM-112

< DISASSEMBLY AND ASSEMBLY >

[VQ40DE]

ENGINE UNIT

• Insert oil jet dowel pin into cylinder block dowel pin hole, and

tighten bolts.

Install main bearings and thrust bearings as follows:

Remove dust, dirt, and engine oil on bearing mating surfaces of cylinder block and main bearing caps.

Install thrust bearings to the both sides of the No. 3 journal hous-
ing on cylinder block.
• Install thrust bearings with the oil groove facing crankshaft arm

(outside).

• Install thrust bearing with a projection on one end on cylinder

block, Align projection with mating notch.

Install main bearings paying attention to the direction.
• Main bearing with oil hole and groove goes on cylinder block.

The one without them goes on lower cylinder block.

• Before installing main bearings, apply engine oil to the bearing

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

• When installing, align main bearing stopper protrusion to cut-

out of cylinder block and lower cylinder block.

• Ensure the oil holes on cylinder block and those on the corre-

sponding bearing are aligned.

Install crankshaft to cylinder block.
• While turning crankshaft by hand, check that it turns smoothly.

Inspect the outer diameter of lower cylinder block bolt. Refer to

EM-117, "Inspection After Disassembly"

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

Apply a continuous bead of liquid gasket using Tool to lower cyl-
inder block as shown.

Use Genuine RTV Silicone Sealant or equivalent. Refer to

CAUTION:

After liquid gasket is applied, rear oil seal installation must
be finished within 5 minutes. Therefore, the following pro-
cedure must be performed quickly.

Tighten lower cylinder block as follows:

Apply new engine oil to threads and seat surfaces of the bolts.

PBIC0898E

PBIC2968E

PBIC2969E

Tool number

: WS39930000 (

—

)

PBIC2942E

ENGINE UNIT

EM-113

< DISASSEMBLY AND ASSEMBLY >

[VQ40DE]

ii.

Tighten M8 bolts in numerical order as shown from No. 17 to 24.

CAUTION:

Wipe off completely any protruding liquid gasket on rear oil
seal installation surface.
NOTE:
There are more processes to complete the tightening bolts.
However stop procedure here to install rear oil seal.

Install rear oil seal. Refer to

EM-91, "Removal and Installation of Rear Oil Seal"

Restart tightening of lower cylinder block bolts as follows:

Tighten M10 bolts in numerical order as shown from No. 1 to 16.
NOTE:
Use TORX socket (size E14) for bolts No. 1 to 16 (M10 bolt).

ii.

Turn M10 bolts 90

clockwise in numerical order from No. 1 to

16 using Tool.

CAUTION:

Use angle wrench Tool to check tightening angle. Do not
make judgement by visual inspection.

• After installing the bolts, make sure that crankshaft can be rotated smoothly by hand.
• Wipe off completely any protruding liquid gasket on front side of the engine.
• Check the crankshaft end play. Refer to

EM-117, "Inspection After Disassembly"

Inspect the outer diameter of connecting rod bolt. Refer to

EM-117, "Inspection After Disassembly"

Install piston to connecting rod as follows:

Install new snap ring to the groove of piston rear side using suitable tool.
• Insert it fully into groove to install.

Install piston to connecting rod.
• Using industrial use drier or similar tool, heat piston until piston pin can be pushed in by hand without

excess force [approx. 60

to 70

C (140

to 158

F)]. From the front to the rear, insert piston pin into pis-

ton and connecting rod.

Bolts 17 - 24

: 22.1 N·m (2.3 kg-m, 16 ft-lb)

PBIC2941E

Bolts 1 - 16

: 35.3 N·m (3.6 kg-m, 26 ft-lb)

PBIC2941E

Tool number

: KV10112100 (BT-8653-A)

WBIA0584E

EM-114

< DISASSEMBLY AND ASSEMBLY >

[VQ40DE]

ENGINE UNIT

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

cylinder number on connecting rod are positioned as shown.

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

smoothly.

10. Install piston rings using piston ring expander or suitable tool.

CAUTION:

• When installing piston rings, be careful not to damage

piston.

• Be careful not to damage piston rings by expending them

excessively.

• If there is stamped mark on ring, mount it with marked side up.

NOTE:
If there is no stamp on ring, no specific orientation is required
for installation.

• Position each ring with the gap as shown referring to the pis-

ton front mark.

• Check the piston ring side clearance. Refer to

EM-117, "Inspection After Disassembly"

11. Install connecting rod bearings to connecting rod and connecting rod bearing cap.

• Before installing connecting rod bearings, apply engine oil to the bearing surface (inside). Do not apply

engine oil to the back surface, but thoroughly clean it.

SEM838F

PBIC0087E

Stamped mark:

Top ring

: —

Second ring

: R

SEM757G

PBIC0808E

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