Well done! Is the oil pan on an 850 the same?

Thanks Erik. How should I tackle the problem. Tackle oil o-rings before thinking of replacing the lifter.
Does replacing the O-rings normally restore oil pressure and therefore lubricate the lfter again?

Thanks will give the O rings a go, anybody got a link to a tutorial on o-ring replacement..thx

Hi I recently started getting really bad noise from the valve area of the engine. Posted a video on youtube.. https://www.youtube.com/watch?v=q1hg-E9ziYs Through reading through the forum. I take it, is the lifters. I gather they open the valves. Is there a tutorial on how to replace them, how exact...