Bosch Common Rail Inner Coil Shim

Bosch CR Inner Coil Shim - 077-115

The Bosch common rail (CR) inner coil shim is an adjustment component in diesel injectors that operates precisely under high pressure and contributes to maintaining stable injection pressure. It plays a role in the fine adjustment of fuel quantity and directly affects the amount of fuel injected during engine start. It is a standard component in almost all Bosch diesel injectors. Unlike other adjustment shims, it specifically regulates only the fuel quantity delivered during the cranking phase. To achieve high surface quality and precise measurement values, it is manufactured with high accuracy using a lapping process.