Spark Plug: Service and Repair

Spark Plug

Removing

• The LH ignition coils are shown, the RH ignition coils are similar.

- Remove the ignition coil (2). Refer to => [ Ignition Coil ] Service and Repair.






- Prior to removing the spark plug, spray compressed air into the cylinder head opening. This will help prevent foreign material from entering combustion chamber.


The spark plug tubes (1) are a thin wall design. Avoid damaging the spark plug tubes. Damage to the spark plug tube can result in oil leaks.







- Remove the spark plug from the cylinder head using a quality thin wall socket with a rubber or foam insert.

- Inspect the spark plug condition.

Installing

- Check and adjust the spark plug gap with a gap gauging tool (1). Refer to => [ Spark Plug Specifications ] Spark Plug Specifications.







Special care should be taken when installing spark plugs into the cylinder head spark plug wells. Be sure the plugs do not drop into the plug wells as electrodes can be damaged.


The spark plug tubes (1) are a thin wall design. Avoid damaging the spark plug tubes. Damage to the spark plug tube can result in oil leaks.







- Start the spark plug into the cylinder head by hand to avoid cross threading.


Spark plug torque is critical and must not exceed the specified value. Overtightening stretches the spark plug shell reducing its heat transfer capability resulting in possible catastrophic engine failure.

- Tighten the spark plugs to 17.5 Nm (13 ft. lbs.).

• The LH ignition coils are shown, the RH ignition coils are similar.

- Install the ignition coil (2). Refer to => [ Ignition Coil ] Service and Repair.