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7.5 Spark plug service
Recommended spark plug: WR7DC
To ensure proper engine operation, the spark plug must be properly gapped and free of deposits.
1. Open the service door.
2. Remove the spark plug cap.
3. Use the wrench to remove the spark plug.
4. Clean any dirt from around the spark plug base.
5. Visually inspect the spark plug. Discard it if the insulator is cracked or chipped.
Clean the spark plug with a wire brush if it is to be reused.
6. Measure the plug gap with a feeler gauge. The gap should be 0.028-0.031in (0.7-0.8mm). Correct
as necessary by carefully bending the side electrode.
7. Install the spark plug carefully, by hand, to avoid cross-threading.
8. After a new spark plug has been seated by hand, it should be tightened 1/2 turn with a wrench to
compress the sealing washer. If a used plug is being reinstalled, it should only require 1/8 to 1/4 turn
after being seated.
9. Reinstall the spark plug cap.
Spark plug wrench
Spark plug
Fig.14
Plug gap
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