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P15.What is spark plug over-heating? Sustained over-heating can cause an abnormal combustion (pre-ignition), provoking a spark plug electrode fusion.
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over-heated spark plugs show an isolator white surface at the ignition
extremity and salient sediments. The electrode fusion indicates over-heating.
When the spark plug temperature excedes 870°C, the ignition end functions
like a heat fount before spark emission and causes (pre-ignition)
an abnormal combustion. If this situation to stay for a long time, there is the possibility of damaging the piston.
Over-heating
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Over-heating causes
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Causes
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Solutions
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| • Very advanced ignition time | Ignition time adjustment needed. | ||
| • Air/fuel mixture (A/F) too poor. | Air/fuel relation adjustment needed (A/F). | ||
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• Insuficient cooling water and lubricants |
Fill completely cooling water and lubricants. | ||
| • The pressure applied to the turbocharger is too high for a turbo engine | Turbocharger pressure must be adjusted in a turbo engine. | ||
| • Insuficient spark plug torque | Rightly specified torque. | ||
| • Used a spark plug too hot . | Use an appropriate spark plug. |
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