The MAHLE effect to counter alternator failure

What should you keep in mind when replacing the alternator? Here in a nutshell is everything you need to know.

Uncovered is already half the job done—grab leaks by the collar

Oil residue in the alternator
Oil residue in the alternator
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Just like with other components in the engine compartment, it is important to check the area. This will usually help track down the cause of the defect quickly. First clue: oily residue! This immediately tells you that something is wrong here.

But how does engine oil even get into the alternator? Serious defects often have a simple cause: a small leak in the cylinder head area, or just carelessness when adding engine oil or changing the oil filter.

And the damage is already done: increased brush sparking and increased wear, overheating of the voltage regulator, and the brushes seize up.

The oil and carbon dust bond together to form a slurry-like mass and become electrically conductive. When the “slurry” builds up between the slip rings on the rotor and the alternator housing, sooner or later there will be a short circuit!

Severe wear on the slip rings and carbon brushes
Severe wear on the slip rings (left) and carbon brushes (right)

Therefore:

  • Always cover the alternator with a rag when changing the oil filter.
  • (For tips on how to change the oil filter, go to: http://www.mpulse.mahle.com/en/do-and-get/changing-the-filter.jsp)
  • Track down and fix any leaks in the engine, fuel system, or hydraulic system.
  • Always thoroughly clean up engine oil, diesel, and hydraulic residues.

Alternators for heavyweights, too

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Starting immediately in the MAHLE Aftermarket product range: 23 new alternators in OE quality for the ten largest manufacturers of heavy-duty commercial vehicles. But that’s not all—we have plans to offer alternators for 80% of all commercial vehicle applications in the future.

Find the right MAHLE Original alternator here: Link

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