Nissan ENGINE - Compression Pressure Testing

EM-22
< PERIODIC MAINTENANCE >
[VQ40DE]
COMPRESSION PRESSURE
COMPRESSION PRESSURE
Compression Pressure INFOID:0000000008798961
CHECKING COMPRESSION PRESSURE
1. Warm up engine thoroughly.
2. Release fuel pressure. Refer to EC-491, "Fuel Pressure Check"
.
3. Disconnect fuel pump fuse to avoid fuel injection during mea-
surement.
4. Remove intake manifold collector. Refer to EM-25, "Removal and Installation"
.
5. Remove spark plug from each cylinder. Refer to EM-16, "Removal and Installation"
.
6. Connect engine tachometer (not required in use of CONSULT).
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 and recharge as necessary. Check
the engine speed again with the battery properly charged.
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
Revision: January 2013 2013 Xterra