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Lion Yard Trading
Mercedes-Benz · Engine

Pistons and piston rings

The pistons and the rings that seal them to the bore, control oil and transfer heat.

How you know it is this

  • Blue smoke under load and on overrun
  • Oil consumption with clean plugs ruled out
  • Low compression that improves when oil is put down the bore — that points at rings
  • A knock under load from one cylinder

Worth knowing before you buy

  • The oil-down-the-bore test separates rings from valves and costs nothing. Worth doing before buying anything.
  • Pistons come in size grades. A rebored engine needs oversize pistons and the bore has to be measured first.
  • Ring replacement means the engine out and the head off. On most cars the labour is worth more than the parts.

What we need to quote it. The engine code, and the bore size if the engine has been rebuilt before. 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.

Piston, rings and pinConnecting rod and shellsCrankshaft and mainsEngine blockCrank pulley / damperFlywheel and ring gearSeals and gasketsSump and gasket
Block and rotating assembly — schematic, to show where the part sits. Arrangement is right; it is a diagram and not a fitment reference.

Rest of the block and rotating assembly

All engine parts
Get in touch

Pistons and piston rings 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)