Not sure where to post this (Here, Vintage, or Unimog) but this seemed the best place to start as it's tech info I am after... I have an old boat with an OM-321 5.1 Ltr engine installed (from what i can gather it is the marinised version of the engine that was used on some Unimog's and early Coaches. I have been able to find the settings for Tappets etc and have a parts book but can not find any service info, in particular how to check / set the injector timing or the location of timing marks on the block... Can anyone out there help? Kind Regards, Andy Kayll