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COMPRESSION INSPECTION [MZR-CD (RF Turbo)]

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  Warning

  • When the engine and the oil are hot, they can badly burn. Be careful not to burn yourself during removal/installation of each component.

1. Verify that the battery is fully charged.

  • Recharge it if necessary. (See BATTERY INSPECTION [MZR-CD (RF Turbo)].)

2. Warm up the engine to the normal operating system temperature.

3. Stop the engine and allow it to cool off for about 10 min.

  Warning

  • Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injuries or death and damage. Fuel can also irritate skin and eyes. To prevent fuel from spurting out of the glow plug hole, do not ground the fuel injector terminal. (See Fuel Line Safety Procedures.)

4. Disconnect the fuel injector connector.

  Warning

  • If the glow plug harness connector is connected, the glow plug harness and engine component can come into contact and cause a short when the engine switch is ON. Disconnect the glow plug harness connector before turning the engine switch on.

5. Remove the engine cover. (See TIMING BELT REMOVAL/INSTALLATION [MZR-CD (RF Turbo)].)

6. Remove all the glow plugs. (See GLOW PLUG REMOVAL/INSTALLATION [MZR-CD (RF Turbo)].)

7. Install the SSTs into the glow plug hole.

8. Crank the engine and note the maximum gauge reading.

9. Inspect each cylinder as above.

  • If the compression in one or more cylinders is low, pour a small amount of clean engine oil into the cylinder and reinspect the compression.

  - If the compression increases, the piston, the piston rings, or cylinder wall may be worn and overhaul is required.
  - If the compression stays low, a valve may be stuck or improperly seated and overhaul is required.
  - If the compression in adjacent cylinders stays low, the cylinder head gasket may be damaged or the cylinder head may be distorted and overhaul is required.

Compression pressure

  Standard : 2,900 kPa {29.6 kgf/cm2, 420.6 psi} [250 rpm]
  Minimum : 2,700 kPa {27.5 kgf/cm2, 391.6 psi} [250 rpm]
  Maximum difference between cylinders : 300 kPa {3.1 kgf/cm2, 43.51 psi}

10. Remove the SSTs.

11. Install the glow plug. (See GLOW PLUG REMOVAL/INSTALLATION [MZR-CD (RF Turbo)].)

12. Instal the engine cover. (See TIMING BELT REMOVAL/INSTALLATION [MZR-CD (RF Turbo)].)

13. Reconnect the fuel injector connector.

14. Erase DTC from PCM memory using the SST. (WDS or equivalent).