Measure the spark plug electrode gap with a feeler gauge

  1. Application Response Measurement (ARM)
  2. Before cranking the engine, ground all spark plug
  3. Before removing the spark plug, use compressed air to blow away any dirt accumulated in the spark plug well, to prevent it from falling into the cham- ber.
  4. Before removing the spark plug, use compressed air to blow away any dirt accumulating in the spark plug wells to prevent it from falling into the cylinder.
  5. C Measure the rotor tip clearance with a feeler gauge - rotor marks (arrowed)

is lined with a rubber grommet to protect the porcelain insulator of the spark plug and to hold the plug while you insert it into the spark plug hole. You will also need a feeler gauge to check and adjust the spark plug gap and a torque wrench to tighten the new plugs to the specified torque (see illustration).

2 If you are renewing the plugs, purchase the new plugs, adjust them to the proper gap and then fit each plug one at a time. Note: When buying new spark plugs, it's essential that you obtain the correct plugs for your specific vehicle. This information can be found in the Specifications Section at the beginning of this

Chapter, or in the owner's handbook.

3 Inspect each of the new plugs for defects. If there are any signs of cracks in the porcelain insulator of a plug, don't use it.

4 Check the electrode gaps of the new plugs. Check the gap by inserting the feeler gauge of the proper thickness between the electrodes at the tip of the plug (see illustration). The gap between the electrodes should be identical to that listed in this Chapter's Specifications. If the gap is incorrect, carefully bend the curved side electrode slightly.

Caution: Some plugs are supplied with the gap preset. There is no need to adjust them.

5 If the side electrode is not exactly over the centre electrode, align them.


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