Less frequent replacement
It’s because of the aforementioned durability that most official Mercedes-Benz maintenance schedules don’t even mention timing chains. Instead, they assume that the chain will last the lifetime of the car, and exclude it from routine services altogether.
The M271 CGI engine goes even further – instead of having interconnected links, timing chains in these engines use a series of prominent “teeth”, connected by strong side links.
The teeth offer a more aggressive fit with sprockets that turn the camshaft and crankshaft, reducing the chance of the chain coming loose. Furthermore, this also makes the timing chains in these engines even less prone to wear and tear.
In fact, in many cases timing failures aren’t the result of a problem with the chain itself, but rather the hydraulic camshaft actuating gears.
Of course, that isn’t always how things play out in the real world.
That’s why the Mercedes-Benz specialists at German Auto Repairs & Service don’t strictly follow the maintenance schedule. Instead, we’ll take a look at the condition of your timing chain and offer our expert opinion regarding whether or not it really needs replacing.