Hyundai HYBCF31 User Manual page 29

6.2. Spark plug.
The spark plug MUST be fully tightened otherwise the engine will overheat causing damage.
Always complete the following steps after the engine has been turned off and allowed to cool
down.
6.2.1. To make sure the engine runs correctly a spark plug gap of 0.6 -0.7 mm must be
maintained and the spark plug must be free of carbon deposits.
6.2.1. To remove the spark pull off the HT lead and then undo the spark plug using the
supplied box spanner in an anti-clockwise direction.
6.2.3. Once the plug has been removed check it for visual damage, electrode wear and
carbon deposits. Replace a damaged or badly worn spark plug. Clean off any carbon deposits
by using a soft brass brush.
6.2.4. Check the gap with a feeler gauge and adjust electrode at the correct gap of 0.6 -0.7
mm.
6.2.5. Check the spark plug washer for damage and replace if required.
6.2.6. Refit the spark plug by hand to make sure it does not cross thread, tighten the spark
plug to a torque of 12/15Nm.
Page 29 Ver 4 - September 2016