COMPRESSION INSPECTION [MZR 1.6]

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Warning

•  Hot engines can cause severe burns. Be careful not to burn yourself during removal/installation of each component.

•  Fuel vapor is hazardous. It can very easily ignite, causing serious injury and damage. Always keep sparks and flames away from fuel.

•  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 this, always complete the “Fuel Line Safety Procedure” when servicing the fuel system. (See BEFORE SERVICE PRECAUTION [MZR 1.6].)

1.  Verify that the battery is fully charged. (See BATTERY INSPECTION [MZR 1.6].)

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

3.  Complete the “Fuel Line Safety Procedure”, and remove the fuel pump relay. (See BEFORE SERVICE PRECAUTION [MZR 1.6].)

4.  Perform the following procedure.

5.  Remove the ignition coils. (See IGNITION COIL REMOVAL/INSTALLATION [MZR 1.6].)

6.  Remove the spark plugs. (See SPARK PLUG REMOVAL/INSTALLATION [MZR 1.6].)

7.  Measure the compression pressure using the following procedure.

(1)  Connect the compression gauge into the spark plug hole.

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(2)  Depress the accelerator pedal.

(3)  Crank the engine and measure the compression pressure.

Compression

Standard: 1,470 kPa {14.99 kgf/cm², 213.2 psi}[250 rpm]

Minimum: 1,029 kPa {10.49 kgf/cm², 149.2 psi}[250 rpm]

Maximum difference between cylinders: 196.1 kPa {2.0 kgf/cm², 28.5 psi} or less

(4)  Perform Steps (1) to (3) all of the cylinders.

(5)  If it is less than the minimum specification, or there is a cylinder with a compression value that varies from that of other cylinders by 196.1 kPa {2.0 kgf/cm², 28.5 psi} or more perform Steps (1) to (3) adding a small quantity of engine oil from the spark plug hole.

•  If the pressure increases by adding the engine oil, the piston ring or the cylinder surface is worn, or they are damaged. Perform overhaul servicing.

•  If the pressure does not increase, valve seizure, valve attachment failure, or pressure leaking from the cylinder head gasket might be occurring. Perform overhaul servicing.

8.  Install in the reverse order of removal.