Removal/refitting

REMOVAL/REFITTING

• Disconnect the battery (-) terminal.

1. Disconnect the high voltage cables from the ignition coils.

1. Disconnect the electrical connection from the ignition coils.
2. Slacken the four fastening screws and remove the ignition coils.

SPARK PLUGS (1970 c.c. Engine)

The standard spark plugs are of the type with surface discharge with one point and a centre electrode.

In order to operate correctly a precise gap must be maintained between the electrodes.

The spark plugs are positioned asymmetrically in the bursting chamber and they differ in size as shown in the following diagram.

Firing order

CHECKING AND REPLACEMENT

• With the engine cold, remove the spark plugs blowing inside to remove any traces of dirt.
• Check for dirt or breaks on the ceramic insulation. In which case change the spark plugs.

CAUTION: The use of spark plugs of a different type or size than those specified can cause serious damage to the engine and alter the level of harmful emissions at the exhaust.

CAUTION: A dirty or burnt out spark plug is often symptomatic of a fault in the engine supply system. For example:

• Traces of carbon powder: incorrect mixture, air cleaner very dirty;
• Oil stains: oil seepage from the piston rings;
• Formation of ash: presence of aluminium material, especially in the oil;

CHECKS AND INSPECTIONS

Check that the ignition coil characteristics are within the specified limits. If not, change the coils.