Every machine on this earth has a different working criteria. Be it of the similar category or something extremely different, every machine holds a different functionality altogether. To explain here, petrol engines and diesel engines have a different working. In fact they use different kind of plugs as well. While we install a spark plug in petrol engine, a diesel engine requires a glow plug for its functioning.
Glow plugs are the devices which helps in the ignition process inside the combustion chamber even at low temperatures. There are times that you tend to face some problem with the functioning of your vehicle, and it comes out that your glow plug is at fault. But, why do your glow plugs break? Given below are some reasons:
1.Old age: Older glow plugs tend to swell up and are not able to be removed from the cylinder head. They will first need to be unthread until the swollen portion amidst it does not allow the plug to come out with drill and extracting. There are certain engines which do not have on-car kits for extracting the plugs. This then requires removal of the cylinder head.
2. Electrical failure: You must always keep this in mind that a diesel engine uses high compression detonations to run. In order to keep up to this, the glow plug requires activation of its circuit sticks and this keeps the glow plug powered up. Functioning in such high temperatures, your glow plug will tend to face certain electrical failure and then will not be able to be removed.
3. Mechanical failure: During the functioning, when an injector drips fuel, it tends to contact the glow plug and this can cause it to mushroom. The worst case scenario is when the fuel drips on the hot glow plugs. In such a case, the glow plugs tend to break and the pieces bounce around the chamber. These bouncing pieces can make their way down in to the cylinder and cause damage to the pistons or the valves.