Nissan Pathfinder (2011 year). Instruction — part 364
COMPRESSION PRESSURE
EM-23
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COMPRESSION PRESSURE
Compression Pressure
INFOID:0000000006246999
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-27, "Removal and Installation"
5. Remove spark plug from each cylinder. Refer to
EM-17, "Removal and Installation"
.
6. Connect engine tachometer (not required in use of CONSULT-III).
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 the specified range, check the battery. Check the engine speed again with a
properly charged battery.
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
2011 Pathfinder
EM-24
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COMPRESSION PRESSURE
• 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, 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, 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, cylinder head gaskets may be leaking, or a valve in adjacent
cylinders may be damaged. Inspect and repair as required.
• 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.
9. Install the components in the reverse order of removal.
10. Start the engine, and confirm that it runs smoothly.
11. Perform trouble diagnosis. If DTC appears, erase it. Refer to
.
2011 Pathfinder
ENGINE ROOM COVER
EM-25
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REMOVAL AND INSTALLATION
ENGINE ROOM COVER
Removal and Installation
INFOID:0000000006247000
CAUTION:
Do not damage or scratch cover when installing or removing.
REMOVAL
1. Remove the engine room cover bolts using power tool.
2. Lift up on engine cover firmly to dislodge snap fit mounts.
INSTALLATION
Installation is in the reverse order of removal.
WBIA0622E
2011 Pathfinder
EM-26
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AIR CLEANER AND AIR DUCT
AIR CLEANER AND AIR DUCT
Exploded View
INFOID:0000000006247001
Removal and Installation
INFOID:0000000006247002
CAUTION:
Handle mass air flow sensor with care.
• Do not shock it.
• Do not disassemble it.
• Do not touch its sensor.
NOTE:
Add marks as necessary for easier installation.
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. Disconnect crankcase ventilation hose.
4. Remove the air duct and resonator assembly and air cleaner case (upper).
5. Remove air cleaner filter and air cleaner case (lower).
INSPECTION AFTER REMOVAL
Inspect air duct and resonator assembly for cracks or tears.
• If anything found, replace air duct and resonator assembly.
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
AWBIA0133GB
2011 Pathfinder
INTAKE MANIFOLD COLLECTOR
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INTAKE MANIFOLD COLLECTOR
Exploded View
INFOID:0000000006247003
Removal and Installation
INFOID:0000000006247004
REMOVAL
1. Remove engine room cover. Refer to
EM-25, "Removal and Installation"
2. Remove air duct and resonator assembly. Refer to
EM-26, "Removal and Installation"
3. Remove electric throttle control actuator as follows:
a. Partially drain engine coolant. Refer to
CO-13, "Changing Engine Coolant"
WARNING:
To avoid the danger of being scalded, never drain engine coolant when engine is hot.
CAUTION:
• Perform when engine is cold.
• Do not spill engine coolant on drive belt.
b. Disconnect water hoses from electric throttle control actuator.
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
2011 Pathfinder
EM-28
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INTAKE MANIFOLD COLLECTOR
d. Loosen bolts in reverse order as shown.
CAUTION:
• Handle carefully to avoid any shock to electric throttle
control actuator.
• Do not disassemble.
4. Remove the following parts:
• Vacuum hose (to brake booster)
• PCV hose
5. Loosen bolts in reverse order as shown to remove intake mani-
fold collector support.
6. Disconnect EVAP hoses and harness connector from EVAP canister purge volume control solenoid valve.
7. Remove EVAP canister purge volume control solenoid valve.
8. Remove VIAS control solenoid valve and vacuum tank.
• Add mating marks as necessary for easier installation.
9. Loosen nuts and bolts in reverse order as shown with power
tool, and remove intake manifold collector.
CAUTION:
Cover engine openings to avoid entry of foreign materials.
INSTALLATION
Installation is in the reverse order of removal. Note the following:
Intake Manifold Collector
• If stud bolts were removed from intake manifold, install them and tighten to the specified torque.
• Tighten nuts and bolts in numerical order as shown.
PBIC2875E
PBIC2876E
PBIC2877E
Intake manifold collector
bolts and nuts
: 11.0 N·m (1.1 kg-m, 8 ft-lb)
Stud bolts : 6.9 N·m (0.7 kg-m, 61 in-lb)
PBIC2877E
2011 Pathfinder
INTAKE MANIFOLD COLLECTOR
EM-29
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Electric Throttle Control Actuator
• Tighten bolts in numerical order as shown.
• Perform the “Throttle Valve Closed Position Learning” when har-
ness connector of electric throttle control actuator is disconnected.
EC-25, "Throttle Valve Closed Position Learning"
.
• Perform the “Idle Air Volume Learning” and “Throttle Valve Closed
Position Learning” when electric throttle control actuator is
replaced. Refer to
EC-25, "Idle Air Volume Learning"
.
PBIC2875E
2011 Pathfinder
EM-30
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INTAKE MANIFOLD
INTAKE MANIFOLD
Exploded View
INFOID:0000000006247005
Removal and Installation
INFOID:0000000006247006
REMOVAL
1. Remove intake manifold collector. Refer to
EM-27, "Removal and Installation"
2. Remove fuel tube and fuel injector assembly. Refer to
EM-47, "Removal and Installation"
3. Loosen nuts and bolts with power tool in reverse order as shown
to remove intake manifold.
4. Remove gaskets.
CAUTION:
Cover engine openings to avoid entry of foreign materials.
INSPECTION AFTER REMOVAL
Surface Distortion
1.
Intake manifold
2.
Gasket
PBIC2878E
PBIC2879E
2011 Pathfinder
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