NGK warns of common bad practices with glow plugs

Brand expert also highlights the problems that these components can cause when they fail

São Paulo, October 2024- Diesel engines have a high compression ratio, that generates a lot of heat. Diesel is injected into this mass of hot air, triggering ignition without the need for an electric spark. On low-displacement diesel engines, common in Brazil in pickup trucks, SUVs and vans, Warming plugs provide additional heat for easy cold starting. These parts are essential when starting at low temperatures, But its improper use can reduce the life and performance of the engine. To support the performance of vehicles using these components, and NGK, Niterra brand specialized in components for ignition systems, Warns about five bad practices that should not be done with the pieces.

1- Individual replacement of spark plugs: Replacing only the spark plug that had a problem is an inappropriate practice. Heater plugs in the same set have the same service life, and changing the complete set is essential to ensure the optimal operation of the cold start system.

2- Use of incompatible candles: Each vehicle has specific characteristics for the cold start system. Using improper glow plugs can result in engine starting problems and even more serious engine failures. It is necessary to apply the recommended spark plug for the vehicle model.

3- Direct tests on battery: A dangerous practice is to test the glow plugs directly on the battery. In addition to representing a risk of accidents, This may damage the candle permanently, compromising the starting system.

4- Installation without cleaning the housing: Installing a new glow plug without proper cleaning of the cylinder head housing can cause difficulty in installation and make it difficult to seal the glow plug in the cylinder head. It is essential to use the specific tool for this cleaning.

5- Incorrect torque application: Inadequate torque when installing the spark plugs can lead to gas leaks, damage to the heater candle or damage to the engine. The application of the correct torque, as per manufacturer's specifications, ensures proper fixation and proper functioning of the system.

Problems caused by faulty glow plugs

Glow plugs do not require preventative maintenance, and it is necessary to replace them when they fail. Ideally, the annual cold start system check, especially if there are signs of white smoke at engine start, difficulties in starting or failures in the cold phase. In the most modern vehicles, The illumination of the injection light on the dashboard can be indicative of problems in the system.

"In addition to the difficulties related to cold start and the risk of engine failures during this phase, An additional problem resulting from neglect of the correct functioning of the cold start system is lubricating oil contamination. This contamination can compromise the effectiveness of the lubricant and, consequently, reduce engine life due to accelerated oil degradation", afirma Hiromori Mori, Niterra Technical Assistance Consultant.

NGK emphasizes the importance of proper practices to ensure system longevity and efficient performance of diesel engines. On their website and e-catalog, The company provides a heating candle application table for easy consultation.