It may not help much this long after your question, but.... Your Volvo or Yanmar dealer would know best. Your engine is a Yanmar 4TNV98T if you have to call Yanmar. I don't think Yanmar has a requirement to set the valves at any interval (at least not until 2000 hours or something...), so I would imagine on this new of a machine there are not too many reasons to adjust this...., but you probably have a good reason. If it's still under warranty doing this yourself could cause you a headache down the road. Sorry for the lack of detailed information. Good Luck!
