Infiniti G37 Coupe. Manual — part 612
COMPRESSION PRESSURE
EM-23
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• If compression pressure is below the minimum value, check valve clearances and parts associated with
combustion chamber (valve, valve seat, piston, piston ring, cylinder bore, cylinder head, cylinder head
gasket). After checking, measure compression pressure again.
• If a cylinder has 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 pis-
ton rings and replace if necessary.
- If the compression pressure remains at low level despite the addition of engine oil, valves may be mal-
functioning. Check valves for damage. Replace 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 are leaking. In such a case, replace cyl-
inder head gaskets.
9.
After inspection is completed, install removed parts.
10. Start the engine, and check that the engine runs smoothly.
11. Perform trouble diagnosis. If DTC appears, erase it. Refer to
EM-24
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ENGINE COVER
ON-VEHICLE REPAIR
ENGINE COVER
Exploded View
INFOID:0000000001636248
Removal and Installation
INFOID:0000000001636249
REMOVAL
Remove engine cover with power tool.
CAUTION:
Never damage or scratch engine cover when installing or removing.
INSTALLATION
Installation is the reverse order of removal.
1
: Engine cover
JPBIA1049GB
DRIVE BELT AUTO TENSIONER AND IDLER PULLEY
EM-25
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DRIVE BELT AUTO TENSIONER AND IDLER PULLEY
Exploded View
INFOID:0000000001547578
Removal and Installation
INFOID:0000000001547579
Removal
1.
Remove drive belt. Refer to
.
• Keep auto-tensioner pulley arm locked after drive belt is removed.
2.
Remove auto-tensioner and idler pulley. Refer to
• Keep auto-tensioner pulley arm locked to install or remove auto-tensioner.
Installation
Installation is the reverse order of removal.
CAUTION:
If there is damage greater than peeled paint, replace drive belt auto-tensioner.
1.
Front timing chain case
2.
Idler pulley
3.
Drive belt auto-tensioner
4.
Idler pulley
5.
Idler pulley
Refer to
JPBIA1059GB
EM-26
< ON-VEHICLE REPAIR >
AIR CLEANER AND AIR DUCT
AIR CLEANER AND AIR DUCT
Exploded View
INFOID:0000000001547580
Removal and Installation
INFOID:0000000001547581
REMOVAL
1.
Disconnect mass air flow sensor harness connector.
2.
Disconnect PCV hose.
3.
Remove air cleaner case & mass air flow sensor assembly and air duct & air hose by disconnecting their
joints.
• Add marks as necessary for easier installation.
4.
Remove mass air flow sensor from air cleaner case, as necessary.
CAUTION:
Handle mass air flow sensor according to the following instructions.
• Never shock it.
• Never disassemble it.
• Never touch its sensor.
INSTALLATION
Note the following, and install in the reverse order of removal.
1.
Mass air flow sensor (RH)
2.
Air cleaner filter
3.
Holder
4.
Bracket
5.
Resonator (RH)
6.
Bracket
7.
Grommet
8.
Grommet
9.
Air cleaner case (RH)
10. Clamp
11.
Air duct (RH)
12. Clamp
13. PCV hose
14. Air duct (LH)
15. Mass air flow sensor (LH)
16. Air cleaner case (LH)
17. Bracket
18. Resonator (LH)
19. Bracket
20. Clamp
21. PCV hose
A.
To electric throttle control actuator
B.
To rocker cover (bank 2)
for symbols in the figure.
JPBIA1349GB
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