So far, nobody has mentioned the possibility of worn parts in the rocker arms and supporting mechanism. Quite commonly, there is significant wear on the rocker arms, rocker shaft, or rocker arm pivots. The rocker arms can wear into the shaft, or the shaft can wear into the rocker arms - whichever is softer to allow for excessive clearance. Also consider that the pushrod can wear into the rocker arm and be nearly undetectable except for the noise. Normally, a lifter operates in the center of its travel. As clearances start to increase, the plunger in the lifter operates closer and closer to the top of its travel. Wear can occur at ANY of the above mentioned places, and will begin to cause a buildup of clearances that add up to keeping the lifter at the top of its travel and causing noise.
Note that I did not say what your problem is. As a professional mechanic for over 40 years, I would not even attempt to diagnose your problem from miles away. I would need to check things out for myself. I do NOT believe in "short answers" to every problem. As I have found out over the years, each problem has its own causes and solutions. And, the same problem in one engine may not be the same as the similar problem in another engine.
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Today's Featured Article - Show Coverage: Journey to Ankeny - by Cindy Ladage. We left Illinois on the first day of July and headed north and west for Ankeny, Iowa. Minus two kids, we traveled light with only the youngest in tow. As long as a pool was at the end of our destination she was easy to please unlike the other two who have a multitude of requirements to travel with mom and dad. Amana Colonies served as a respite where we ate a family style lunch that sustained us with more food than could reasonably fit into our ample physiques. The show at Ankeny
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