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Mercedes Benz rotor

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Mercedes Benz rotor
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The alternator is arguably the hardest-working component under the hood of your vehicle. It produces a current and then transfers that current to the battery. This, in turn, powers the electrical features of your car while your alternator makes sure the battery remains alive. If the battery goes, so too, will your radio, headlights, and other features that depend on the juice.

If you have ever turned the key in your car's ignition and heard a clicking noise, you'll already be familiar with the sound of a dying alternator. The noise indicates the component needs to be replaced. For most drivers, the question is, how long can the part be expected to last?

We're going to explore this question in more detail below. Because your alternator is so important to the smooth operation of your vehicle, it's worth examining the factors that can shorten its life. You'll discover that its longevity depends largely on the quality of its design.

Slow Deterioration Over Thousands Of Miles

One of the most common reasons an alternator fails is because it was built poorly in the first place. New components are rarely an issue. You can expect them to last up to 100,000 miles. Replacement parts, however, are another matter entirely. Often, a poorly-designed rebuilt is used to replace an original unit that has died. Unfortunately, if the craftsmanship of the rebuilt is lacking, the replacement can fail within months due to the load placed upon it.

Another reason this component can fail is due to normal wear and tear. Over time, the diodes can wear down, the stator windings may become ineffective, or the needle bearing on which the part's rotor spins can deteriorate.

The wear and tear suffered by the alternator may be accelerated by other circumstances. For example, extreme heat generated by the engine can slowly take a toll; the battery may lose its charge, taxing the component more than normal; dirt may infiltrate the part. It's often difficult to know these things are occurring, especially because they happen gradually. However, you can - and should - periodically test the component to make sure it is in good condition.

Testing And Maintaining The Component

In order to test the alternator, you'll need to purchase a voltmeter. They normally cost less than $20 and can be found at most auto supply stores. This device tests output level. To use it, turn your car's engine over and allow it to idle for a minute. Make sure your radio, DVD player, headlights, and similar features are turned off.

Then, attach the voltmeter's positive and negative connections to the positive and negative posts on your battery. The device should display a reading between 13.8 and 15.3 volts. Next, turn on your headlights and look at the reading again; turn on your radio and take another look; turn your vehicle's heater on. The voltmeter's reading should never dip below 12 volts. If it does, there's a good chance your alternator is faulty or failing. In both cases, you'll need to have it replaced.

Thoughts On Replacing The Part

Even though alternators are commonly rebuilt, they are rarely repaired. The diodes, bearings, rotor, and other pieces that wear down with time are usually replaced. That means if the component fails, the replacement - whether a new unit or a rebuilt - will have new pieces fitted.

As mentioned earlier, the quality of a rebuilt varies by the rebuilder. For this reason, replacing a failing alternator with an OEM-certified unit is always recommended; it should come with a warranty that covers it for at least a year. Don't be tempted to save a few dollars by purchasing a cheap substitute. You'll find this is one component where the investment in higher quality is worthwhile.

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Mercedes Distributor Rotor---giving the Necessary Spark

The primary task of the ignition system in Mercedes Benz vehicle is to ignite the fuel at exactly the right time so that the expanding gases can do the maximum amount of work. It is usually switched on and off through a lock switch operated with a key or a code patch. If the ignition system fires at the wrong time, power will fall and gas consumption and emissions can increase. Because of this task, the ignition system is considered an important part of the overall engine system.

And for that spark to be made, subcomponents are needed to do such tasks. This includes the sparkplugs, ignition coil and the distributor. The distributor deserves more credit as performs various functions like distributing high voltage from the coil to the correct cylinder and breaking the current to the coil.

Working in tie-up with the distributor cap in the distributor assembly, the Mercedes distributor rotor distributes electricity from the ignition coils to the spark plug wires at the right timing. It switches high-sparking voltage from the spark plugs to fire in correct sequences.

The metal part of the Mercedes distributor rotor contacts the central high voltage cable from the coil via a spring loaded carbon brush. The metal part of the rotor arm passes close to (but does not touch) the output contacts which connect via high tension cables to the spark plug of each cylinder. As the rotor spins within the distributor, electrical current is able to jump the small gaps created between the rotor arm and the contacts due to the high voltage created by the ignition coil.

The firing end of the Mercedes distributor rotor is from where the high tension spark jumps to each of the cap terminals. It should not be worn because wearing out will result in resistance to the high tension spark. A worn firing end of the rotor requires immediate replacement. The rotors are mounted on the upper end of the distributor shaft. Thus, the Mercedes distributor rotor must have a snug fit on the end of the shaft. With other designs, two screws are used to attach the rotor to a plate on the top of the distributor shaft. Built-in locators ensure correct reassembly. These are found at the rotor and holes in the plate. One of which is round while the other is square.

About the Author

Dwyane Thomas is a part time cook and full-time auto-enthusiast. This 31-year old Civil and Environmental graduate is a consultant at one of the engineering firms in Pennsylvania.

Are repairs expensive for a 2004 Mercedes Benz C240?

Hello, I just purchased a 2004 Mercedes Benz C240 with 32,000 miles on it. The car drives like a dream come true. I have owned many expensive vehicles and I know it will be expensive to work on. I have owned BMWS, JAGUARS, and now this mercedes.. My question is how much are repairs for my mercedes? Such as brakes, rotors, transmission, and belts, hoses etc?? If anyone knows any costs I would appreciate hearing how much they are.. This car drives much better than my previous 2003 BMW 330XI. Also is my car reliable? Any opinions would be deeply appreciated! thanks so much!

If you are used to Jags and BMWS, parts are in line with those makes.

As to reliability, you should have stuck with your 330xi unless it was giving you problems.

The W203 C-Class Mercedes is one of the least reliable cars Mercedes ever made, and 2004 was a very bad year.

Electrical problems are very common. Fit and finish problems are common (lots of rattles and squeaks, trim pieces falling off, etc.).

Check any source you like -- consumer reports, Edmunds, JD Power. All will tell you the C-class from 2003 thorugh 2006 are lemons.
On a personal level my 2004 C320 spent more time at the dealer getting things fixed than any car I've ever owned, by a wide margin.
That said, you could get lucky. Just because reliability was awful in general doesn't mean your particular car would be. It may run fine. While there are lots of electrical problems and quality problems, these cars will rarely leave you stranded. You may see a lot of "check engine" lots pop on, but it will most always start and run -- mechanicals are very sound.

I'd seriously consider an aftermarket warranty if you don't have one.

Eurocopter Brings “Mercedes-Benz style” to EC145 Twin-Engine Helicopter
Geneva, Switzerland, May 4, 2010. Eurocopter has teamed with renowned automobile manufacturer Mercedes-Benz to develop a special edition of the EC145 twin-engine turbine helicopter with a high-end interior, which was unveiled today at the 2010 European Business Aviation Convention & Exhibition in Geneva, Switzerland.

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