I have an 85 GL 100,000 Km. with a distinct valve noise knock. The noise
subsides somewhat when it warms up. I assume it is caused by a leaking
hydraulic valve lifter.
I thought about replacing all the lifters on spec, but wonder if anyone
would share the benefit of their experience.
Would pulling each lifter to identify/replace the leaking one be
feasible/possible?  Or is the "shotgun" approach the way to go?