Timing Chain Marks Explained - Opel 1.6 CDTi. • In this video, we move on to installing the new timing chains and setting the timing marks on the Opel 1.6 CDTI diesel engine (engine code B16DTE). After disassembly and inspection, we begin one of the most critical stages of the repair - the correct installation of the timing chain and the oil pump chain. • The video clearly shows a comparison between the stretched old chain and the new one, explaining how chain elongation develops over time and w