Hi all, first time I've ever used something like this but hopefully I can get some assistance. I had some knocking noise coming from my engine on my Grand voyager 2.8 Diesel automatic. my friend correctly identified the risers and injectors required replacing. My friend has replace the risers and injectors but now we are having issues getting the timing sorted, the engine won't rev past 2200 without knocking resuming. Any help would be appreciated, I have no mechanical knowledge but my friend is a mechanic so he will understand technical terms. Thank you Bob