What would cause the glowplugs in four of eight cylinders to melt off ON a 7.3 liter idi diesel?

Answer 1

• if you are inexperienced in working with diesel engines, it is advisable to have a diesel technician look at it.

• To diagnose the cause of your melted glow plug, look at the surface of the plug. If the plug is melted inward, causing one or more hollows in the metal, you may assume that the cause is an open circuit coil. The burns themselves could then be caused by more than one issue; for instance, jump-starting the engine with an open circuit coil, or an overly long current feed caused by a sticky relay.

• If your plug is melted from the surface down on the heating element (a small tubelike metal fixture with a rounded tip), you may assume that the heating element was overheated and could not withstand the level of heat. This could be a result of engine damage, dripping, coked or worn nozzles, or a premature injection of fuel.

• If the glow plug is melted at the tip of the heating fixture, this may be a cause of a premature injection of fuel into the engine. Another cause might be the reduction of the gap between the plug housing and heating element, causing too much heat to flow from the heating fixture and resulting in the melting of the tip of the glow plug.