Engineered for superior cold-start performance
Glow plug reaches higher temperatures more quickly for fast engine start-up
*Available for most diesel powered cars and light trucks. Some applications employ standard glow plug technology per original equipment manufacturer's specs.
Controls current draw for rapid heat-up of heating coil
Provides rapid heat-up of the glow tube and quick start-up
Resists corrosion and vibration for long service life
Provides superior electrical insulation and high thermal conductivity
Protect coils from exhaust gas damage for long life
Precise fit and easy installation
Glow Plug Technical Guide
Download the consumer brochure for more information on Bosch Glow Plugs.
Unlike gasoline engines which use a spark plug to ignite an air/fuel mixture, diesel engines rely on the heat of highly-compressed air to ignite a precise amount of fuel to initiate combustion. Heating the air to a minimum starting temperature of 850°C is critical for diesel engine start-up.
In low temperatures, factors such as cold intake air and cold cylinder walls hinder the attainment of the necessary starting temperature. In these situations, glow plugs function as an additional heat source to bring the intake air up to the temperature necessary to initiate the combustion cycle.
There are two basic types of diesel combustion cycles:
Direct-injection engine1. Nozzle holder with injection nozzle2. Sheathed-element glow plug3. Combustion chamber
Pre-chamber engine1. Nozzle holder with injection nozzle 2. Sheathed-element glow plug 3. Pre-chamber 4. Combustion chamber
No matter which type of diesel engine a vehicle has, Bosch supplies just the right glow plug to give you dependable cold-start performance.
Bosch’s revolutionary Duraterm® glow plug technology utilizes a self-regulating control system that reduces glow wait time by more than 50%. The patented dual-control regulating and heating coil effectively directs current draw, enabling the glow plug to reach higher temperatures more quickly for faster engine start-up. The regulating coil keeps the heating element within the 1000° – 1100°C optimal temperature range, preventing engine damage due to over voltage/overheating.
For vehicles with a post-glow† control system, this advanced technology offers a post-glow heating phase. During the post-glow phase, glow plugs continue to operate for up to three minutes after the engine has started, improving overall engine performance and reducing smoke emissions and combustion noise.
Bosch Duraterm® technology is available for the majority of diesel car and light truck applications. Other applications employ standard glow plug technology per OE specifications.
Excessive voltage is the leading cause of glow plug failure.Glow plugs are designed to operate within a temperature range of 850° – 1100°C. During operation, the glow plug controller switches current to the glow plug for a specific period of time to allow for proper heating. However, when the controller fails, current could be applied for a longer than specified time causing the temperature of the glow plug to exceed the 1100°C upper limit. Under these conditions, the glow plug overheats causing the casing to swell, split or burst which allows air to enter the coil area causing immediate failure.
Other causes of glow plug failure include:
Damage like this will most likely result in engine failure. Removing a glow plug with a distended or broken tip may require engine head removal — a time-consuming and costly repair.
Heed the warning signs of worn glow plugs (see Question 5) and replace them with a brand new set of Bosch Glow Plugs!
The following signs most likely indicate that it’s time to change a vehicle’s glow plugs. If any of these conditions exist, be sure to check the vehicle’s glow plugs and if necessary, replace them with a new set of Bosch Glow Plugs.
If one glow plug fails, chances are the others won’t be far behind. To minimize vehicle down-time and save on labor costs, Bosch recommends changing all glow plugs at the same time.
You can replace OE glow plugs with Bosch with complete confidence. Bosch is currently the OE glow plug on most European diesel vehicle applications. And for Domestic and Japanese vehicle applications, Bosch Glow Plugs are designed to meet and/or exceed the OE glow plug specifications.
Greater reliability and quick engine start-up
For superior diesel performance
100% New for exact precision
© Robert Bosch GmbH