Nissan Frontier D40. Instruction — part 601
EM-136
< ON-VEHICLE MAINTENANCE >
[VQ40DE]
COMPRESSION PRESSURE
COMPRESSION PRESSURE
Compression Pressure
INFOID:0000000005274324
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-140, "Removal and Installation"
5.
Remove spark plug from each cylinder. Refer to
EM-130, "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 liquid for proper gravity. Check the
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-137
< ON-VEHICLE MAINTENANCE >
[VQ40DE]
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• 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 the 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.
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
EM-138
< ON-VEHICLE REPAIR >
[VQ40DE]
ENGINE ROOM COVER
ON-VEHICLE REPAIR
ENGINE ROOM COVER
Removal and Installation
INFOID:0000000005274325
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
AIR CLEANER AND AIR DUCT
EM-139
< ON-VEHICLE REPAIR >
[VQ40DE]
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AIR CLEANER AND AIR DUCT
Exploded View
INFOID:0000000005274326
Removal and Installation
INFOID:0000000005274327
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-138, "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).
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
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