M45x AWD V8-4.5L (VK45DE) (2008)
Compression Check: Testing and Inspection
CHECKING COMPRESSION PRESSURE
1. Warm up engine thoroughly. Then, stop it.
2. Release fuel pressure. Refer to EC-700, "Fuel Pressure Check".
a. Remove fuel pump fuse to avoid fuel injection during measurement.
3. Remove engine cover with power tool.
4. Remove ignition coil and spark plug from each cylinder.
5. Connect engine tachometer (not required in use of CONSULT-III).
6. Install compression gauge with adapter (SST or commercial service tool) onto spark plug hole.
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Use compression gauge adapter (SST) which is required on No. 7 and 8 cylinders.
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Use compression gauge adapter (if no SST is used) whose picking up end inserted to spark plug hole is smaller than 20 mm (0.79 in) in
diameter. Otherwise, it may be caught by cylinder head during removal.
7. With accelerator pedal fully depressed, 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
CAUTION: Always use a fully changed battery to obtain the specified engine speed.