Why Are Ignition Coils Lubricated? (VIDEO) -

Why Are Ignition Coils Lubricated? (VIDEO)

Do you know why Mercedes lubricates their ignition coils at the factory? This video is sponsored by Standard Motor Products.

CC: Here’s a quick quiz. Why are the boots of most Mercedes Benz ignition coils lubricated at the factory according to a recent TSB?

A) To create a watertight seal between the boot and insulator of the spark plug.

B) To condition the boot against ozone generated by the EM radiation caused by the ignition system.

C) To make the boot easier to remove for service.

The answer is C. The small amount of grease makes the boot easier to remove for service. There is no need to create a water tight seal because water rarely enters the spark plug tube. While the ignition system does create some EM radiation and ozone while it is operating, it is not enough to damage the boot.

Mercedes applies one gram of lubricant (which is smaller than the size of a pea) to the inside surface of the boot so it can be slid off when the coil or boot is removed from the spark plug.

What is the advice from the TSB? Pay it forward. If you are installing a new coil or a boot, apply a small amount of dielectric grease to the inside of the boot. The grease can be applied with a swab. Not only are you making it easier for the next technician, it also makes installation just a little bit easier.

This video is sponsored by Standard Motor Products.

You May Also Like

Learn How To Safely Lift HEVs and BEVs

If you can’t lift a vehicle without damage, you will not be able to unlock this service opportunity in this growing segment.

Most HEV and EV vehicle repairs are not those done to battery packs or electric motors. Instead, the most significant repair opportunities are tires, brakes, and suspension. And if you can’t lift a vehicle without damage, you will not be able to unlock this service opportunity in this growing segment. The stakes are higher for EVs and hybrids because if a lift arm or adapter is not correctly placed, it could damage an expensive battery pack mounted under the vehicle. Some of these battery packs can cost five figures to replace. Also, there is a fire hazard. If a battery pack is impacted or punctured, never guess where or how to pick up a vehicle. A vehicle’s owner’s manual or service manual often will provide guidance on where to find and how to access the appropriate jacking and lifting points. Some EVs and HVS have specific lift points stamped into the unibody.

Understanding LSPI & Engine Oil

Discover the importance of using the correct oil specification for your vehicle.

Understanding Air Suspension

We explore the evolution and functionality of air suspension systems for vehicles.

Suspension Bushings: Role, Materials, and Wear Indicators

Regular inspection and timely replacement of worn bushings are crucial for optimal vehicle performance and safety.

Randy Breaux, Group President, GPC North America, Talks to AMN Drivetime

At NAPA, “Breaux Knows” business relationships, ABCs to avoid, and serving the automotive professional.

Other Posts
Spark Plug Replacement

Here are some tips to follow when replacing a spark plug.

Serpentine Belt and Drive System Maintenance

Properly maintaining the entire drive system prevents premature belt wear and system failure, ensuring customer satisfaction and vehicle reliability.

EGR Systems: Understanding Exhaust Gas Recirculation

Learn how it works, its history, and its impact on both performance and the environment.

Advanced Cooling System Technologies: Hybrid & EVs

Learn how to keep your hybrid or electric vehicle running smoothly and efficiently.