Infiniti QX56 (JA60). Manual — part 467
EM-22
< ON-VEHICLE MAINTENANCE >
CAMSHAFT VALVE CLEARANCE
6. Install the camshaft.
7. Manually turn the crankshaft pulley a few turns.
8. Make sure the valve clearances for a cold engine are within specifications. Refer to
.
9. After completing the repair, check the valve clearances again with the specifications for a warmed engine.
Make sure the values are within specifications. Refer to
.
COMPRESSION PRESSURE
EM-23
< ON-VEHICLE MAINTENANCE >
C
D
E
F
G
H
I
J
K
L
M
A
EM
N
P
O
COMPRESSION PRESSURE
Checking Compression Pressure
INFOID:0000000005148983
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 each cylinder. Refer to
EM-16, "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-24
< ON-VEHICLE REPAIR >
ENGINE ROOM COVER
ON-VEHICLE REPAIR
ENGINE ROOM COVER
Removal and Installation
INFOID:0000000005148984
CAUTION:
Do not damage or scratch engine room cover when installing or removing.
REMOVAL
• Remove the engine room cover bolts and engine room cover.
INSTALLATION
Installation is in the reverse order of removal.
WBIA0795E
AIR CLEANER AND AIR DUCT
EM-25
< ON-VEHICLE REPAIR >
C
D
E
F
G
H
I
J
K
L
M
A
EM
N
P
O
AIR CLEANER AND AIR DUCT
Exploded View
INFOID:0000000005148985
Removal and Installation
INFOID:0000000005148986
REMOVAL
1. Remove the engine room cover using power tool. Refer to
EM-24, "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.
4. Remove air cleaner filter and air cleaner case (lower)
• Add marks as necessary for easier installation.
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
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст