ISO 6627 pdf download Internal combustion engines — Piston rings — Expander/segment oil-control rings 1 Scope This International Standard specifies the essential dimensional features of expander/segment oil-control rings,without providing a complete product description (because expander-spacer design varies from piston-ringmanufacturer to piston-ring manufacturer，the interaction between the manufacturer and the client wildetermine specific design details). This International Standard applies to expanderlsegment oil-control...