Nissan Pathfinder (2009 year). Manual — part 381
ENGINE ASSEMBLY
EM-105
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The procedure is described assuming that you use a engine holding the surface, to which transmission is
installed.
a.
Remove drive plate.
• Holding crankshaft pulley bolts, lock crankshaft to remove drive plate bolts.
• Loosen bolts diagonally.
CAUTION:
• Be careful not to damage drive plate. Especially avoid
deforming and damaging of signal plate teeth (circum-
ference position).
• Place the drive plate with signal plate surface facing
other than downward.
• Keep magnetic materials away from signal plate.
CAUTION:
Use an engine stand that has a load capacity [approximately 240kg (529 lb) or more] large enough
for supporting the engine weight.
• If the load capacity of the stand is not adequate, remove the following parts beforehand to
reduce the potential risk of overturning the stand.
- Remove fuel tube and fuel injector assembly. Refer to
EM-45, "Removal and Installation"
- Remove intake manifold. Refer to
EM-29, "Removal and Installation"
- Remove rocker cover. Refer to
EM-41, "Removal and Installation"
.
- Other removable brackets.
CAUTION:
Before removing the hanging chains, make sure the engine stand is stable and there is no risk of
overturning.
28. Remove generator. Refer to
CHG-20, "Removal and Installation"
.
29. Remove engine mounting insulator bracket (upper) with power tool.
INSTALLATION
Installation is in the reverse order of removal.
CAUTION:
• When replacing an engine or transmission you must make sure the dowels are installed correctly
during reassembly.
• Improper alignment caused by missing dowels may cause vibration, oil leaks or breakage of driv-
etrain components.
INSPECTION AFTER INSTALLATION
• Before starting the engine, check oil/fluid levels including engine coolant and engine oil. If the levels are
lower than required quantity, fill to the specified level. Refer to
MA-12, "Fluids and Lubricants"
• Use procedure below to check for fuel leakage.
• Turn ignition switch ON (with engine stopped). With fuel pressure applied to the fuel piping, check for fuel
leakage at the 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 and 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 gas, or any oil/fluids including
engine oil and engine coolant.
• Bleed air from passages in lines and hoses, such as in cooling system.
• After cooling down the engine, again check oil/fluid levels including engine oil and engine coolant. Refill to
specified level if necessary.
• Summary of the inspection items:
KBIA2491E
2009 Pathfinder
EM-106
< REMOVAL AND INSTALLATION >
[VQ40DE]
ENGINE ASSEMBLY
* Transmission/transaxle/CVT fluid, power steering fluid, brake fluid, etc.
Item
Before starting engine
Engine running
After engine stopped
Engine coolant
Level
Leakage
Level
Engine oil
Level
Leakage
Level
Other oils and fluids*
Level
Leakage
Level
Fuel
Leakage
Leakage
Leakage
Exhaust gas
—
Leakage
—
2009 Pathfinder
ENGINE UNIT
EM-107
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DISASSEMBLY AND ASSEMBLY
ENGINE UNIT
Exploded View
INFOID:0000000003939517
1.
Reinforcement plate
2.
Drive plate
3.
Rear oil seal
4.
Sub harness
5.
Knock sensor
6.
Water connector
7.
Cylinder block
8.
Oil jet
9.
Thrust bearing
10. Pilot converter
11. Main bearing
12. Crankshaft
13. Crankshaft key
14. Lower cylinder block
15. Lower cylinder block bolt
16. Connecting rod bolt
17. Connecting rod bearing cap
18. Connecting rod bearing
19. Connecting rod
20. Snap ring
21. Piston pin
22. Piston
23. Oil ring
24. Second ring
25. Top ring
WBIA0582E
2009 Pathfinder
EM-108
< DISASSEMBLY AND ASSEMBLY >
[VQ40DE]
ENGINE UNIT
Disassembly and Assembly
INFOID:0000000003939518
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.
1.
Remove engine assembly from vehicle. Refer to
EM-103, "Removal and Installation"
.
2.
Remove both exhaust manifolds. Refer to
EM-31, "Removal and Installation"
.
1.
Cylinder block
2.
Gasket
3.
Cylinder block heater
4.
Connector protector cap
PBIC2936E
2009 Pathfinder
ENGINE UNIT
EM-109
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3.
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.
• 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.
4.
Drain engine oil. Refer to
PBIC0805E
PBIC0085E
2009 Pathfinder
EM-110
< DISASSEMBLY AND ASSEMBLY >
[VQ40DE]
ENGINE UNIT
5.
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.
6.
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.
7.
Remove cylinder head. Refer to
EM-92, "Removal and Installation"
8.
Remove sub harness, and remove knock sensors.
CAUTION:
Carefully handle sensor avoiding shocks.
9.
Remove pilot converter using Tool as necessary.
WLIA0020E
Tool number
: — (J-48761)
PBIC2938E
Tool number
: ST16610001 (J-23907)
WBIA0583E
2009 Pathfinder
ENGINE UNIT
EM-111
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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-118, "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 from piston.
• Before removing piston rings, check the piston ring side clearance. Refer to
.
• 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:
a.
Remove snap ring using snap ring pliers.
PBIC2940E
PBIC0087E
PBIC1638E
2009 Pathfinder
EM-112
< DISASSEMBLY AND ASSEMBLY >
[VQ40DE]
ENGINE UNIT
b.
Heat piston to 60
°
to 70
°
C (140
°
to 158
°
F) with industrial use
drier or equivalent.
c.
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
.
• 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.
NOTE:
When replacing rear oil seal without removing lower cylinder block, use a suitable tool 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:
• Do not drop main bearing, or scratch the surface.
• Identify installation positions, and store them without mixing them up.
22. Remove oil jet.
ASSEMBLY
PBIC1639E
PBIC0262E
PBIC2941E
Tool number
: KV10111100 (J-37228)
2009 Pathfinder
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