Nissan Pathfinder (2008 year). Manual — part 375
COMPRESSION PRESSURE
EM-163
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COMPRESSION PRESSURE
Compression Pressure
INFOID:0000000001301161
CHECKING COMPRESSION PRESSURE
1.
Warm up the engine thoroughly. Then stop the engine.
2.
Release the fuel pressure. Refer to
.
CAUTION:
If CONSULT-III is not used to release fuel pressure leave the fuel pump fuse disconnected until
step 7.
3.
Remove the spark plug from the cylinder to be checked. Refer to
EM-156, "Removal and Installation"
.
4.
Connect the engine tachometer (not required in use of CONSULT-III).
5.
Install the compression tester with Tool into the spark plug hole.
6.
With the accelerator pedal fully depressed, turn the ignition
switch to “START” for cranking. When the gauge pointer stabi-
lizes, read the compression pressure and engine rpm. Perform
these steps to check each cylinder.
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 the specified range, check the battery liquid for proper gravity. Check the
engine speed again with normal battery gravity.
• If the compression pressure is below the minimum value, check the valve clearances and parts associ-
ated with the combustion chamber (valve, valve seat, piston, piston ring, cylinder bore, cylinder head,
cylinder head gasket). After checking, measure the compression pressure again.
• If some cylinders have low compression pressure, pour a 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, the piston rings may be worn out or damaged. Check
the piston rings and replace if necessary.
- If the compression pressure remains at a low level despite the addition of engine oil, the valves may be
malfunctioning. Check the valves for damage. Replace the 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, the gaskets may be leaking, or a valve in adjacent cylinders
may be damaged. Inspect and repair as required.
7.
Install the components in the reverse order of removal.
8.
Start the engine and confirm that it runs smoothly.
9.
Perform trouble diagnosis. If DTC appears, erase it. Refer to
Tool number
: EG15050500 (J-45402)
Standard
Minimum
Deference limit be-
tween cylinders
1,520 (15.5, 220) / 200
1,324 (13.5, 192) / 200
98 (1.0, 14) / 200
WBIA0605E
EM-164
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ENGINE ROOM COVER
ON-VEHICLE REPAIR
ENGINE ROOM COVER
Removal and Installation
INFOID:0000000001282013
REMOVAL
• Remove the engine cover bolts and cover.
CAUTION:
Do not damage or scratch cover when installing or removing.
INSTALLATION
Installation is in the reverse order of removal.
ALBIA0414GB
AIR CLEANER AND AIR DUCT
EM-165
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AIR CLEANER AND AIR DUCT
Removal and Installation
INFOID:0000000001282017
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 assembly
⇐
Front
ALBIA0413GB
EM-166
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INTAKE MANIFOLD
INTAKE MANIFOLD
Removal and Installation
INFOID:0000000001282019
REMOVAL
1.
Remove the air dam using power tool.
2.
Remove the engine undercover using power tool.
3.
Partially drain the engine coolant. Refer to
CO-39, "Changing Engine Coolant"
WARNING:
To avoid the danger of being scalded, never drain the engine coolant when the engine is hot.
4.
Remove the engine room cover using power tool. Refer to
EM-164, "Removal and Installation"
.
5.
Release the fuel pressure. Refer to
6.
Remove the air duct and resonator assembly. Refer to
EM-165, "Removal and Installation"
7.
Disconnect the fuel tube quick connector on the engine side.
1.
Intake manifold
2.
PCV hose
3.
Gasket
4.
Electric throttle control actuator
5.
Water hose
6.
Water hose
7.
PCV hose
8.
EVAP hose
9.
EVAP canister purge control solenoid
valve
10.
Bracket
11.
Gasket
KBIA2461E
LBIA0395E
INTAKE MANIFOLD
EM-167
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• Perform the following steps to disconnect the quick connector
using Tool.
a.
Remove quick connector cap (engine side only).
b.
With the sleeve side of Tool facing quick connector, install Tool
onto fuel tube.
c.
Insert Tool into quick connector until sleeve contacts and goes
no further. Hold the Tool in that position.
CAUTION:
Inserting the Tool hard will not disconnect quick connector.
Hold Tool where it contacts and goes no further.
d.
Draw and pull out quick connector straight from fuel tube.
CAUTION:
• Pull quick connector holding "A" position in illustration.
• Do not pull with lateral force applied. O-ring inside quick connector may be damaged.
• Prepare container and cloth beforehand as fuel will leak out.
• Avoid fire and sparks.
• Be sure to cover openings of disconnected pipes with plug or plastic bag to avoid fuel leakage
and entry of foreign materials.
8.
Remove or disconnect harnesses, brackets, vacuum hose, vacuum gallery and PCV hose and tube from
intake manifold.
9.
Remove electric throttle control actuator by loosening bolts diagonally.
CAUTION:
• Handle carefully to avoid any damage to the electric throttle control actuator.
• Do not disassemble.
10. Remove the fuel injectors and fuel tube assembly. Refer to
EM-180, "Removal and Installation"
.
11. Loosen the bolts in reverse order shown using power tool.
12. Remove the intake manifold.
CAUTION:
Cover engine openings to avoid entry of foreign materials.
• Clean all gasket mating surfaces, do not reuse gaskets.
INSTALLATION
Installation is in the reverse order of removal.
SBIA0354E
Tool number
: 16441 6N210 (J-45488)
WBIA0604E
KBIA2462E
EM-168
< ON-VEHICLE REPAIR >
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INTAKE MANIFOLD
• Tighten the intake manifold bolts in numerical order as shown.
• Install the EVAP canister purge control solenoid valve connector with it facing front of engine.
• Tighten the electronic throttle control actuator bolts of the electric throttle control actuator equally and diago-
nally in several steps.
• After installation perform procedure in "INSPECTION AFTER INSTALLATION".
• Install the water hose so that its overlap width for connection is between 27 mm (1.06 in) and 32 mm (1.26
in) (target: 27 mm 1.06 in).
Connecting Quick Connector of Fuel Tube
Install quick connector as follows (the steps are the same for quick connectors on both engine side and vehi-
cle side except for the quick connector cap).
1.
Make sure no foreign substances are deposited in and around tube and quick connector, and they are not
damaged.
2.
Thinly apply new engine oil around the fuel tube from tip end to the spool end.
3.
Align center to insert quick connector straight into fuel tube.
• Insert until the paint mark for engagement identification (white)
goes completely inside quick connector so that you cannot see
it from the straight side of the connected part. Use a mirror to
check this where it is not possible to view directly from the
straight side, such as quick connector on vehicle side.
• Insert fuel tube into quick connector until top spool is com-
pletely inside quick connector, and 2nd level spool exposes
right below quick connector on engine side.
CAUTION:
• Hold "A" position in illustration when inserting fuel tube
into quick connector.
• Carefully align center to avoid inclined insertion to pre-
vent damage to O-ring inside quick connector.
• Insert until you hear a "click" sound and actually feel the
engagement.
• To avoid misidentification of engagement with a similar
sound, be sure to perform the next step.
4.
Pull quick connector by hand holding "A" position. Make sure it is completely engaged (connected) so that
it does not come out from fuel tube.
NOTE:
Recommended pulling force is 50 N (5.1 kg, 11.2 lb).
KBIA2462E
PBIC0017E
KBIA0272E
INTAKE MANIFOLD
EM-169
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5.
Install the quick connector cap on the quick connector joint (on
engine side only).
6.
Install the fuel hose and tube to hose clamps.
7.
Refill the engine coolant. Refer to
INSPECTION AFTER INSTALLATION
• After installing fuel tubes, make sure there is no fuel leakage at connections in the following steps.
- Apply fuel pressure to fuel lines by turning ignition switch ON (with engine stopped). Then check for fuel
leaks at connections.
- Start the engine and rev it up and check for fuel leaks at the connections.
• Perform procedures for “Throttle Valve Closed Position Learning” after finishing repairs. Refer to
"Throttle Valve Closed Position Learning"
• If electric throttle control actuator is replaced, perform procedures for “Idle Air Volume Learning” after finish-
ing repairs. Refer to
EC-497, "Idle Air Volume Learning"
.
SBIA0354E
EM-170
< ON-VEHICLE REPAIR >
[VK56DE]
EXHAUST MANIFOLD AND THREE WAY CATALYST
EXHAUST MANIFOLD AND THREE WAY CATALYST
Removal and Installation
INFOID:0000000001282020
REMOVAL
WARNING:
Perform the work when the exhaust and cooling system have cooled sufficiently.
1.
Remove the air dam using power tool.
2.
Remove the engine undercover using power tool.
3.
Remove front final drive assembly (4WD models). Refer to
DLN-376, "Removal and Installation"
.
4.
Remove the main muffler assembly and center exhaust tube. Refer to
EX-5, "Removal and Installation"
.
5.
Remove the front exhaust tubes. Refer to
EX-5, "Removal and Installation"
6.
Remove front tires.
7.
Remove fender protectors. Refer to
EXT-20, "Removal and Installation of Front Fender Protector"
8.
Remove the LH and RH air fuel ratio A/F sensors.
• Follow steps below to remove each air fuel ratio A/F sensor.
a.
Remove the harness connector of each air fuel ratio A/F sensor, and harness from bracket and middle
clamp.
1. Air fuel ratio A/F sensor 1 (RH)
2. Exhaust manifold cover (RH)
3. Exhaust manifold (RH)
4. Gaskets
5. Exhaust manifold (LH)
6. Exhaust manifold cover (LH)
7. Air fuel ratio A/F sensor 1 (LH)
ALBIA0415GB
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