Nissan Pathfinder (2008 year). Manual — part 357
CAMSHAFT VALVE CLEARANCE
EM-19
< ON-VEHICLE MAINTENANCE >
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• Measure the valve clearances at locations marked “
×
” as
shown in the table below (locations indicated in the illustration)
with feeler gauge.
• No. 1 cylinder at compression TDC
c.
Rotate crankshaft by 240
°
clockwise (when viewed from engine
front) to align No. 3 cylinder at TDC of its compression stroke.
NOTE:
Crankshaft pulley bolt flange has a stamped line every 60
°
. They
can be used as a guide to rotation angle.
• Measure the valve clearances at locations marked “
×
” as
shown in the table below (locations indicated in the illustration)
with feeler gauge.
• No. 3 cylinder at compression TDC
Measuring position (RH bank)
No. 1 CYL.
No. 3 CYL.
No. 5 CYL.
No. 1 cylinder at
compression TDC
EXH
×
INT
×
Measuring position (LH bank)
No. 2 CYL.
No. 4 CYL.
No. 6 CYL.
No. 1 cylinder at
compression TDC
INT
×
EXH
×
PBIC2054E
PBIC2916E
Measuring position (RH bank)
No. 1 CYL.
No. 3 CYL.
No. 5 CYL.
No. 3 cylinder at
compression TDC
EXH
×
INT
×
Measuring position (LH bank)
No. 2 CYL.
No. 4 CYL.
No. 6 CYL.
No. 3 cylinder at
compression TDC
INT
×
EXH
×
PBIC2055E
EM-20
< ON-VEHICLE MAINTENANCE >
[VQ40DE]
CAMSHAFT VALVE CLEARANCE
d.
Rotate crankshaft by 240
°
clockwise (when viewed from engine
front) to align No. 5 cylinder at TDC of compression stroke.
• Measure the valve clearances at locations marked “
×
” as
shown in the table below (locations indicated in the illustration)
with feeler gauge.
• No. 5 cylinder at compression TDC
4.
For the measured value out of the standard, perform adjustment.
ADJUSTMENT
• Perform adjustment depending on selected head thickness of valve lifter.
1.
Measure the valve clearance.
2.
Remove camshaft. Refer to
EM-81, "Removal and Installation"
.
3.
Remove valve lifters at the locations that are out of the standard.
4.
Measure the center thickness of removed valve lifters with
micrometer.
5.
Use the equation below to calculate valve lifter thickness for replacement.
PBIC2916E
Measuring position (RH bank)
No. 1 CYL.
No. 3 CYL.
No. 5 CYL.
No. 5 cylinder at
compression TDC
EXH
×
INT
×
Measuring position (LH bank)
No. 2 CYL.
No. 4 CYL.
No. 6 CYL.
No. 5 cylinder at
compression TDC
INT
×
EXH
×
PBIC2056E
KBIA0057E
CAMSHAFT VALVE CLEARANCE
EM-21
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• Thickness of new valve lifter can be identified by stamp marks
on the reverse side (inside the cylinder).
Intake
Available thickness of valve lifter: 27 sizes with range 7.88 to 8.40 mm (0.3102 to 0.3307 in) in steps of
0.02 mm (0.0008 in) (when manufactured at factory). Refer to
.
Exhaust
Available thickness of valve lifter: 25 sizes with range 7.88 to 8.36 mm (0.3102 to 0.3291 in) in steps of
0.02 mm (0.0008 in) (when manufactured at factory). Refer to
.
CAUTION:
Install identification letter at the end and top, “U” and “N”, at each of proper positions. (Be care-
ful of mis-installation between intake and exhaust.)
6.
Install selected valve lifter.
7.
Install camshaft. Refer to
EM-81, "Removal and Installation"
.
8.
Manually turn crankshaft pulley a few turns.
9.
Make sure that the valve clearances for cold engine are within the specifications by referring to the speci-
fied values.
10. Installation of the remaining components is in the reverse order of removal.
11. Start the engine, and check for unusual noise and vibration.
Valve lifter thickness calculation:
t = t
1
+ (C
1
– C
2
)
t
= Valve lifter thickness to be replaced
t
1
= Removed valve lifter thickness
C
1
= Measured valve clearance
C
2
= Standard valve clearance:
Intake
: 0.26 - 0.34 mm (0.010 - 0.013 in)*
Exhaust
: 0.29 - 0.37 mm (0.011 - 0.015 in)*
*: Approximately 20
°
C (68
°
F)
KBIA0119E
Stamp mark
Thickness
788U
7.88 mm (0.3102 in)
790U
7.90 mm (0.3110 in)
·
·
·
·
840U
8.40 mm (0.3307 in)
Stamp mark
Thickness
N788
7.88 mm (0.3102 in)
N790
7.90 mm (0.3110 in)
·
·
·
·
N836
8.36 mm (0.3291 in)
EM-22
< ON-VEHICLE MAINTENANCE >
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COMPRESSION PRESSURE
COMPRESSION PRESSURE
Compression Pressure
INFOID:0000000001301160
CHECKING COMPRESSION PRESSURE
1.
Warm up engine thoroughly.
2.
Release fuel pressure. Refer to
.
3.
Disconnect fuel pump fuse to avoid fuel injection during mea-
surement.
4.
Remove intake manifold collector. Refer to
EM-26, "Removal and Installation"
5.
Remove spark plug from each cylinder. Refer to
.
6.
Connect engine tachometer (not required in use of CONSULT-lIl).
7.
Install compression tester with adapter onto spark plug hole.
• Use compression gauge whose pick up end inserted to spark
plug hole is smaller than 20 mm (0.79 in) in diameter. Other-
wise, it may be caught by cylinder head during removal.
8.
Turn ignition switch to “START” for cranking. When the gauge pointer stabilizes, read the compression
pressure and engine rpm. Perform these steps to check each cylinder.
Compression pressure:
Unit: kPa (kg/cm
2
, psi) /rpm
CAUTION:
Always use a fully charged battery to obtain specified engine speed.
• If the engine speed is out of specified range, check battery liquid for proper gravity. Check engine speed
again with normal battery gravity.
BBIA0534E
PBIC0900E
SBIA0533E
Standard
Minimum
Differential limit between cylinders
1,275 (13.0, 185) / 300
981 (10.0, 142) / 300
98 (1.0, 14) / 300
COMPRESSION PRESSURE
EM-23
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• If compression pressure is below minimum value, check valve clearances and parts associated with
combustion chamber (valve, valve seat, piston, piston ring, cylinder bore, cylinder head, cylinder head
gasket). After the checking, measure compression pressure again.
• If some cylinders have low compression pressure, pour small amount of engine oil into the spark plug
hole of the cylinder to re-check it for compression.
• If the added engine oil improves the compression, piston rings may be worn out or damaged. Check the
piston rings and replace if necessary.
• If the compression pressure remains at low level despite the addition of engine oil, valves may be mal-
functioning. Check valves for damage. Replace valve or valve seat accordingly.
• If two adjacent cylinders have respectively low compression pressure and their compression remains
low even after the addition of engine oil, cylinder head gaskets are leaking. In such a case, replace cyl-
inder head gaskets.
9.
After inspection is completed, install removed parts.
10. Start engine, and make sure that engine runs smoothly.
11. Perform trouble diagnosis. If DTC appears, erase it. Refer to
.
EM-24
< ON-VEHICLE REPAIR >
[VQ40DE]
ENGINE ROOM COVER
ON-VEHICLE REPAIR
ENGINE ROOM COVER
Removal and Installation
INFOID:0000000001281970
REMOVAL
1.
Remove bolts using power tool.
2.
Lift up on engine cover firmly to dislodge snap fit mounts.
CAUTION:
Do not damage or scratch cover when installing or remov-
ing.
INSTALLATION
Installation is in the reverse order of removal.
WBIA0622E
AIR CLEANER AND AIR DUCT
EM-25
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AIR CLEANER AND AIR DUCT
Removal and Installation
INFOID:0000000001281975
REMOVAL
1.
Remove the engine room cover using power tool. Refer to
EM-164, "Removal and Installation"
.
2.
Disconnect the harness connector from air cleaner case (upper).
3.
Remove the air duct and resonator assembly and air cleaner case (upper).
4.
Remove air cleaner filter and air cleaner case (lower).
• Add marks as necessary for easier installation.
CAUTION:
Handle mass air flow sensor with care.
• Do not shock it.
• Do not disassemble it.
• Do not touch its sensor.
INSPECTION AFTER REMOVAL
Inspect air duct for crack or tear.
• If anything found, replace air duct.
INSTALLATION
Installation is in the reverse order of removal.
1.
Air cleaner case (lower)
2.
Air cleaner filter
3.
Air cleaner case (upper)
4.
Air duct and resonator
⇐
Front
AWBIA0133GB
EM-26
< ON-VEHICLE REPAIR >
[VQ40DE]
INTAKE MANIFOLD COLLECTOR
INTAKE MANIFOLD COLLECTOR
Removal and Installation
INFOID:0000000001281977
REMOVAL
WARNING:
To avoid the danger of being scalded, never drain engine coolant when engine is hot.
1.
Remove engine cover. Refer to
EM-24, "Removal and Installation"
2.
Remove air cleaner case (upper) with mass air flow sensor and air duct assembly. Refer to
3.
Remove electric throttle control actuator as follows:
a.
Drain engine coolant, or when water hoses are disconnected, attach plug to prevent engine coolant leak-
age. Refer to
CO-12, "Changing Engine Coolant"
.
CAUTION:
• Perform when engine is cold.
• Do not spill engine coolant on drive belt.
b.
Disconnect water hoses from electric throttle control actuator.
• When engine coolant is not drained from radiator, attach plug to water hoses to prevent engine coolant
leakage.
c.
Disconnect harness connector.
1.
Vacuum tank
2.
VIAS control solenoid valve
3.
Vacuum hose
4.
Intake manifold collector support
5.
Water hose
6.
Electric throttle control actuator
7.
Water hose
8.
EVAP hose
9.
Bracket
10. EVAP hose
11.
EVAP canister purge volume control
solenoid valve
12. Gasket
13. Gasket
14. Intake manifold collector
15. Clip
16. PCV hose
17. Connector
18. PCV hose
a.
To intake manifold collector
b.
To power valve
c.
To throttle body
d.
To cylinder head (RH bank)
WBIA0731E
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