6. install the spark plugs carefully, by hand, to avoid cross-threading.
7. After each spark plug is seated, tighten with a spark plug wrench to compress
the washer.
-1 Loose spark plugs can get hot enough to damage the engine.
Overtightening may damage the threads.
NOTE: If installing new spark plugs, tighten l/2 turn after the spark plugs seat to
compress the washers. If reinstalling used spark plugs, tighten l/8-1/4 turn after
the spark plugs seat to compress the washers.
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