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Lion Yard Trading
Mercedes-Benz · Engine

Belt tensioner and idler pulleys

The spring-loaded arm keeping the accessory belt tight, and the plain pulleys guiding its run.

How you know it is this

  • A rumble or grinding from the front of the engine that is there with the belt off the accessories
  • A tensioner arm that bounces visibly at idle
  • Belt squeal that a new belt does not cure
  • A pulley that is rough or noisy when spun by hand

Worth knowing before you buy

  • The bearing in a pulley is what fails, and a seized pulley shreds a new belt in minutes.
  • Spin every pulley by hand while the belt is off — it costs nothing and finds the noisy one.
  • Always fitted with the belt.

What we need to quote it. The engine code. The chassis number settles the generation, the body and usually the engine in seventeen characters — it is on your mulkiya. A photograph of the old part helps where there is more than one version.

Belt, tensioner and idlersEngine mountsGearbox mountBreather / PCVVacuum pump and linesCovers and undertray
Mounts, belt and breather — schematic, to show where the part sits. Arrangement is right; it is a diagram and not a fitment reference.

Rest of the mounts and ancillaries

All engine parts
Get in touch

Belt tensioner and idler pulleys for your Mercedes-Benz?

Send the chassis number and a photograph of the old part. We come back with genuine, OEM and aftermarket options priced side by side, with lead times.

Mon–Sat, 8:00 AM – 6:00 PM · +971 54 303 3119 (Operations Director) · +971 54 241 0599 (Managing Director)