Nissan Pathfinder (2008 year). Manual — part 367
CYLINDER HEAD
EM-99
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Valve Stem Diameter
Measure the diameter of valve stem with micrometer.
Valve Guide Inner Diameter
Measure the inner diameter of valve guide with inside micrometer.
Valve Guide Clearance
(Valve guide clearance) = (Valve guide inner diameter) – (Valve stem diameter).
• If the calculated value exceeds the limit, replace valve and/or valve guide. When valve guide must be
replaced, follow the "VALVE GUIDE REPLACEMENT" procedure.
VALVE GUIDE REPLACEMENT
When valve guide is removed, replace with oversized [0.2 mm (0.008 in)] valve guide.
1.
To remove valve guide, heat cylinder head to 110
°
to 130
°
C
(230
°
to 266
°
F) by soaking in heated oil.
2.
Drive out valve guide with a press [under a 20 kN (2 ton, 2.2 US
ton, 2.0 Imp ton) pressure] or hammer and valve guide drift
(commercial service tool).
CAUTION:
Cylinder head contains heat. When working, wear protec-
tive equipment to avoid getting burned.
Standard
Intake
: 5.965 - 5.980 mm (0.2348 - 0.2354 in)
Exhaust
: 5.955 - 5.970 mm (0.2344 - 0.2350 in)
SEM938C
Standard
Intake and Exhaust
: 6.000 - 6.018 mm (0.2362 - 0.2369 in)
Valve guide clearance:
Standard
Intake
: 0.020 - 0.053 mm (0.0008 - 0.0021 in)
Exhaust
: 0.030 - 0.063 mm (0.0012 - 0.0025 in)
Limit
Intake
: 0.08 mm (0.003 in)
Exhaust
: 0.09 mm (0.004 in)
SEM008A
SEM931C
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CYLINDER HEAD
3.
Ream cylinder head valve guide hole; using suitable reamer.
4.
Heat cylinder head to 110
°
to 130
°
C (230
°
to 266
°
F) by soaking
in heated oil.
5.
Press valve guide from camshaft side to the dimensions as
shown using suitable tool.
CAUTION:
Cylinder head contains heat. When working, wear protec-
tive equipment to avoid getting burned.
6.
Apply reamer finish to valve guide using suitable reamer.
VALVE SEAT CONTACT
Valve guide hole diameter (for service parts):
Intake and exhaust
: 10.175 - 10.196 mm (0.4006 - 0.4014 in)
SEM932C
SEM008A
Projection “L”
Intake and exhaust
: 12.6 - 12.8 mm (0.496 - 0.504 in)
SEM950E
Standard:
Intake and exhaust
: 6.000 - 6.018 mm (0.2362 - 0.2369 in)
SEM932C
CYLINDER HEAD
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• After confirming that the dimensions of valve guides and valves are
within the specifications, perform this procedure.
• Apply prussian blue (or white lead) onto contacting surface of valve
seat to check the condition of the valve contact on the surface.
• Check if the contact area band is continuous all around the circum-
ference.
• If not, grind to adjust valve fitting and check again. If the contacting
surface still has “NG” conditions even after the re-check, replace
valve seat. Follow the "VALVE SEAT REPLACEMENT" procedure.
VALVE SEAT REPLACEMENT
When valve seat is removed, replace with oversized [0.5 mm (0.020 in)] valve seat.
1.
Bore out old seat until it collapses. Boring should not continue beyond the bottom face of the seat recess
in cylinder head. Set the machine depth stop to ensure this. Refer to
CAUTION:
Prevent to scratch cylinder head by excessive boring.
2.
Ream cylinder head recess diameter for service valve seat.
• Be sure to ream in circles concentric to valve guide center.
This will enable valve to fit correctly.
3.
Heat cylinder head to 110
°
to 130
°
C (230
°
to 266
°
F) by soaking
in heated oil.
4.
Provide valve seats cooled well with dry ice. Force fit valve seat into cylinder head.
CAUTION:
• Avoid directly touching cold valve seats.
• Cylinder head contains heat. When working, wear protective equipment to avoid getting burned.
5.
Finish seat to the specified dimensions using suitable tool. Refer
to
.
CAUTION:
When using valve seat cutter, firmly grip cutter handle with
both hands. Then, press on the contacting surface all
around the circumference to cut in a single drive. Improper
pressure on with cutter or cutting many different times may
result in staged valve seat.
6.
Using compound, grind to adjust valve fitting.
SBIA0322E
Oversize [0.5 mm (0.020 in)]
Intake
: 38.500 - 38.516 mm (1.5157 - 1.5164 in)
Exhaust
: 32.700 - 32.716 mm (1.2874 - 1.2880 in)
SEM795A
SEM008A
SEM934C
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CYLINDER HEAD
7.
Check again for normal contact. Follow the "VALVE SEAT CONTACT" procedure.
VALVE SPRING SQUARENESS
• Set try square along the side of valve spring and rotate spring.
Measure the maximum clearance between the top face of spring
and try square.
• If it exceeds the limit, replace valve spring.
VALVE SPRING DIMENSIONS AND VALVE SPRING PRESSURE LOAD
• Check valve spring pressure at the specified spring height.
• If the installation load or load with valve open is out of the standard, replace valve spring.
Limit
: 2.1 mm (0.083 in)
PBIC0080E
Standard:
Intake and exhaust
Free height
: 47.07 mm (1.8531 in)
Installation height
: 37.00 mm (1.4567 in)
Installation load
: 166 - 188 N (16.9 - 19.2 kg, 37 - 42 lb)
Height during valve open
: 27.20 mm (1.0709 in)
Load with valve open
: 373 - 421 N (38.0 - 42.9 kg, 84 - 95 lb)
SEM113
ENGINE ASSEMBLY
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REMOVAL AND INSTALLATION
ENGINE ASSEMBLY
Removal and Installation
INFOID:0000000001281996
WARNING:
• Situate vehicle on a flat and solid surface.
• Place chocks at front and back of rear wheels.
• For engines not equipped with engine slingers, attach proper slingers and bolts described in PARTS
CATALOG.
CAUTION:
• Always be careful to work safely, avoid forceful or uninstructed operations.
1.
Rear engine mounting insulator 4WD
2. Rear engine mounting insulator 2WD
3.
LH engine mounting bracket (upper)
4.
LH heat shield plate
5. LH engine mounting insulator
6.
LH engine mounting bracket (lower)
7.
RH engine mounting bracket (lower)
8. RH engine mounting insulator
9.
RH heat shield plate
10. RH engine mounting bracket (upper)
LBIA0432E
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ENGINE ASSEMBLY
• Do not start working until exhaust system and engine coolant are cooled sufficiently.
• If items or work required are not covered by the engine section, follow the procedures in the applica-
ble sections.
• Always use the support point specified for lifting.
• Use either 2-point lift type or separate type lift. If board-on type is used for unavoidable reasons,
support at the rear axle jacking point with transmission jack or similar tool before starting work, in
preparation for the backward shift of center of gravity.
• For supporting points for lifting and jacking point at rear axle, refer to
REMOVAL
Preparation
1.
Drain engine coolant. Refer to
CO-12, "Changing Engine Coolant"
.
2.
Partially drain A/T fluid. Refer to
TM-182, "Changing the A/T Fluid (ATF)"
3.
Release fuel pressure. Refer to
.
4.
Remove the engine hood. Refer to
DLK-182, "Removal and Installation of Hood Assembly"
5.
Remove engine room cover using power tools.
6.
Remove the air duct and air cleaner case assembly. Refer to
EM-25, "Removal and Installation"
.
7.
Disconnect vacuum hose between vehicle and engine and set it aside.
8.
Remove the radiator assembly and hoses. Refer to
CO-16, "Removal and Installation"
9.
Remove the drive belts. Refer to
EM-13, "Removal and Installation"
.
10. Remove the engine cooling fan. Refer to
CO-19, "Removal and Installation (Crankshaft driven type)"
11. Disconnect the engine room harness from the engine side and set it aside for easier work.
12. Disconnect the engine harness grounds.
13. Disconnect the reservoir tank for power steering from engine and move it aside for easier work.
14. Disconnect power steering oil pump from engine. Move it from its location and secure with a rope for eas-
ier work. Refer to
ST-24, "Removal and Installation"
.
15. Remove the A/C compressor bolts and set aside. Refer to
HA-40, "Removal and Installation for Compres-
.
16. Disconnect brake booster vacuum line.
17. Disconnect EVAP line.
18. Disconnect the fuel hose at the engine side connection. Refer to
EM-47, "Removal and Installation"
.
19. Disconnect the heater hoses at cowl, and install plugs to avoid leakage of engine coolant.
20. Remove the A/T oil level indicator and indicator tube.
21. Remove front final drive assembly (4WD models). Refer to
DLN-343, "Removal and Installation"
.
22. Remove three way catalyst. Refer to
EM-31, "Removal and Installation"
.
23. Install engine slingers into left bank and right bank.
24. Remove transmission. Refer to
(2WD models) or
(4WD models).
25. Lift with hoist and secure the engine in position.
26. Remove engine assembly from vehicle, avoiding interference
with vehicle body.
CAUTION:
• Before and during this lifting, always check if any har-
nesses are left connected.
27. Remove the parts that may restrict installation of engine to engine stand.
NOTE:
The procedure is described assuming that you use a engine holding the surface, to which transmission is
installed.
a.
Remove drive plate.
Engine slinger torque:
28.0 N·m (2.9 kg-m, 21 ft-lb)
WBIA0624E
ENGINE ASSEMBLY
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• 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-47, "Removal and Installation"
- Remove intake manifold. Refer to
EM-29, "Removal and Installation"
- Remove rocker cover. Refer to
EM-42, "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-21, "Removal and Installation"
.
29. Remove engine mounting insulator bracket (upper) with power tool.
INSTALLATION
Installation is in the reverse order of removal.
INSPECTION AFTER INSTALLATION
• Before starting engine, check the levels of engine coolant, engine oil and working fluid. If less than required
quantity, fill to the specified level.
• Use procedure below to check for fuel leakage.
• Turn ignition switch ON (with engine stopped). With fuel pressure applied to fuel piping, check for fuel leak-
age at 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.
• Warm up engine thoroughly to make sure there is no leakage of engine coolant, engine oil, working fluid, fuel
and exhaust gas.
• Bleed air from passages in pipes and tubes of applicable lines, such as in cooling system.
• After cooling down engine, again check amounts of engine coolant, engine oil and working fluid. Refill to
specified level, if necessary.
• Summary of the inspection items:
*Transmission fluid, power steering fluid, brake fluid, etc.
KBIA2491E
Item
Before starting engine
Engine running
After engine stopped
Engine coolant
Level
Leakage
Level
Engine oil
Level
Leakage
Level
Working fluid
Level
Leakage
Level
Fuel
Leakage
Leakage
Leakage
Exhaust gas
—
Leakage
—
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ENGINE UNIT
DISASSEMBLY AND ASSEMBLY
ENGINE UNIT
Disassembly and Assembly
INFOID:0000000001281997
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
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