On the M271 Kompressor, the supercharger clutch and bearings give out at the same mileage the timing tensioner does. We do the complete service — blower and timing — in one visit at your home.
The 2005–2008 M271 Kompressor — the supercharged four-cylinder in the C200K, C230K, and SLK200K — has two aging problems that arrive on the same schedule. The supercharger's electromagnetic clutch and bearings wear out: the clutch slips instead of locking the blower in, and the bearings announce themselves with a whine that gets steadily louder. The result is boost that fades and an engine that's lost the shove the Kompressor badge promised.
At the same mileage, the timing side goes: the chain tensioner loses its ability to hold proper tension, and the chain rattles on cold start while it runs slack for the first seconds. A slack chain accelerates its own stretch and wears the guides — left long enough, it's the same jumped-timing endgame every chain engine faces, with bent valves as the closing act.
These two failures share access, share a timeline, and share a smart repair: do it all at once. Supercharger service plus chain and tensioner in one job means one teardown and a powertrain that's renewed at both of its weak points — instead of two separate repair bills six months apart for an engine that was warning you about both all along.
If your Mercedes-Benz is doing any of these, this is the likely cause:
Both failures get more expensive with patience. A slipping supercharger clutch generates heat that finishes off the bearings, and a slack timing chain stretches itself and chews its guides with every cold start — with valve damage as the eventual stop. Two warnings at once is the engine being unusually honest with you; the cheap window is now.
Yes — both live at the front of the engine, fully accessible in a driveway. It's a long single day on site, and the car never leaves your address. Same repair a shop would do, minus the tow and the wait.
You're paying for two real repairs — a supercharger unit plus a complete timing set — and the careful hours to do both correctly. Dealers price each as a separate ticket at full rates. We quote one flat price for the complete bundle before any work starts; the overlap in access is your savings, built into the number.
You can, but the timing tensioner doesn't care about your schedule — a cold-start rattle is active wear, and the failure mode is bent valves. Since the access overlaps, deferring the timing side saves a little now and costs the full access labour again later. We'll quote both ways so you can see the difference plainly.
That's what we confirm first — a stethoscope check and clutch test at your home separates blower bearings from belt-drive noise in minutes. Pulleys and the belt get inspected as part of the job anyway. You'll know exactly what's making the noise before approving anything.
Send it over for a free second opinion. I'll tell you straight what the job actually involves — and if their quote is fair, I'll tell you that too.
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