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Spark Plugs

S p a r k P l u g s S P A R K P L U G R E M O V E & R E F I T Spark plug removal

Refitting the high tension (H.T.) leads

6

5

4

3

8

7

2

1

H2663

H3578

Remove the plug leads, ensuring that you hold the rubber shroud and NOT the high tension leads (this will ensure no damage occurring to the connectors during removal).

To ensure the correct firing order (1, 8, 4, 3, 6, 5, 7, 2), the high tension leads must be replaced in the correct relationship to each other (as illustrated). Failure to maintain the correct plug lead connections, will result in a misfire and possible damage to the catalytic converter.

Ensure that the recesses around the plugs are free from debris (to avoid foreign matter accidentally entering the cylinder head) and use a suitable spark plug wrench to remove the plugs and washers.

When pushing the leads onto the plugs, ensure that the shrouds are firmly seated on the plugs.

Refitting the plugs When refitting, take care not to cross-thread the spark plugs, otherwise costly damage to the cylinder head will result.

Only fit plugs of a type recommended by the vehicle manufacturer (see ‘ENGINES’, page 241) and tighten to a torque of 15 lbf.ft (20 Nm). Please note that incorrect grades of plug may lead to engine failure and serious damage.

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