Hi grumpy,its a 31E777 Intek, I've taken it out and put a spare 13.5 Intek in the cox but it doesn't have the grunt I need for commercial work.
The 16.5 has about 200 hrs on it, has blown 2 head gaskets and now has something more sinister wrong with it, one valve rod is disconnected - see photo - it started making a goddawful racket, lost power quickly so I shut it down. If you think its something I can repair myself (I'm no mechanic, but have all the tools)fairly easily I'll have a go...otherwise I'm up for a new donk