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Nissan Pathfinder (2008 year). Manual - part 375

COMPRESSION PRESSURE

EM-163

< ON-VEHICLE MAINTENANCE >

[VK56DE]

COMPRESSION PRESSURE

Compression Pressure

INFOID:0000000001301161

CHECKING COMPRESSION PRESSURE

Warm up the engine thoroughly. Then stop the engine.

Release the fuel pressure. Refer to

EC-948, "Fuel Pressure Check"

CAUTION:

If CONSULT-III is not used to release fuel pressure leave the fuel pump fuse disconnected until
step 7.

Remove the spark plug from the cylinder to be checked. Refer to

EM-156, "Removal and Installation"

Connect the engine tachometer (not required in use of CONSULT-III).

Install the compression tester with Tool into the spark plug hole.

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

, 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.

Install the components in the reverse order of removal.

Start the engine and confirm that it runs smoothly.

Perform trouble diagnosis. If DTC appears, erase it. Refer to

EC-554, "Description"

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

< ON-VEHICLE REPAIR >

[VK56DE]

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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[VK56DE]

AIR CLEANER AND AIR DUCT

Removal and Installation

INFOID:0000000001282017

REMOVAL

Remove the engine room cover using power tool. Refer to

EM-164, "Removal and Installation"

Disconnect the harness connector from air cleaner case (upper).

Remove the air duct and resonator assembly and air cleaner case (upper).

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.

Air cleaner case (lower)

Air cleaner filter

Air cleaner case (upper)

Air duct and resonator assembly

⇐

Front

ALBIA0413GB

EM-166

< ON-VEHICLE REPAIR >

[VK56DE]

INTAKE MANIFOLD

INTAKE MANIFOLD

Removal and Installation

INFOID:0000000001282019

REMOVAL

Remove the air dam using power tool.

Remove the engine undercover using power tool.

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.

Remove the engine room cover using power tool. Refer to

EM-164, "Removal and Installation"

Release the fuel pressure. Refer to

EC-948, "Fuel Pressure Check"

Remove the air duct and resonator assembly. Refer to

EM-165, "Removal and Installation"

Disconnect the fuel tube quick connector on the engine side.

Intake manifold

PCV hose

Gasket

Electric throttle control actuator

Water hose

PCV hose

EVAP hose

EVAP canister purge control solenoid
valve

10.

Bracket

11.

Gasket

KBIA2461E

LBIA0395E

INTAKE MANIFOLD

EM-167

< ON-VEHICLE REPAIR >

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• Perform the following steps to disconnect the quick connector

using Tool.

Remove quick connector cap (engine side only).

With the sleeve side of Tool facing quick connector, install Tool
onto fuel tube.

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.

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.

Remove or disconnect harnesses, brackets, vacuum hose, vacuum gallery and PCV hose and tube from
intake manifold.

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 >

[VK56DE]

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.

Thinly apply new engine oil around the fuel tube from tip end to the spool end.

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.

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

< ON-VEHICLE REPAIR >

[VK56DE]

Install the quick connector cap on the quick connector joint (on
engine side only).

Install the fuel hose and tube to hose clamps.

Refill the engine coolant. Refer to

CO-39, "Changing Engine

Coolant"

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

EC-497,

"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