Note: Compression must be measured in case of loss of power, increased oil and/or fuel consumption.
1. Warm up the engine to normal operating temperature and turn it off.
2. Remove the spark plugs.
3. Disconnect the ignition distributor and high-tension wires.
4. Check the compression in the cylinders:
a) Install the compression gauge tightly into the spark plug hole.
b) Open the throttle valve fully.
c) While cranking the engine with the starter, measure the compression pressure.
Note: Use a fully charged battery to ensure the engine speed is at least 250 rpm.
Note (only for models with catalytic converter): This procedure must be performed within a short period of time to avoid overheating the catalytic converter.
d) Repeat steps (a), (b), (c) for each cylinder.
- The compression pressure value is 12.5 kg/cm² (1.2 MPa) and more
- Minimum allowable pressure 9.0 kg/cm² (0.9 MPa)
- Permissible difference between cylinders 1.0 kg/cm² (0.1 MPa) and less
d) If the pressure in any cylinder is less than the permissible value, pour a small amount of engine oil into the cylinder and repeat procedures (a), (b), (c).
If adding oil increases compression, either the rings or the cylinder are damaged or worn.
If the "compression" does not change, this indicates damage to the valves and/or cylinder head gasket.
7. Connect the ignition distributor.
8. Install the spark plugs.
- Tightening torque - 18 Nm