4F20 Piston Rings, Engine Piston Ring Set

4F20 Piston Rings are precision wearing parts for engine with individual package. Installed in piston grooves, they seal combustion chamber, control oil consumption and transfer heat to maintain stable cylinder pressure. Specially fitted for 4F20 engine. Suitable for new‑engine assembly and engine overhaul, replacing worn, weak‑elastic or broken old piston rings to reduce oil‑burning and low cylinder‑pressure faults.