the older ones were metal with an o ring type seal then went to a plastic type that just used a very small bead of sealer around it when you look at it you will see the sealer pushed out or missing. Those tensioners are to be replaced if removed due to the sealer bead being a one time use item. If you are hearing a lot of hissing up top I would be looking at all cam journals . The oil leak at tensioners starves cams for oil and the damage begins there.
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Today's Featured Article - A Lifetime of Farm Machinery - by Joe Michaels. I am a mechanical engineer by profession, specializing in powerplant work. I worked as a machinist and engine erector, with time spent overseas. I have always had a love for machinery, and an appreciation for farming and farm machinery. I was born and raised in Brooklyn, New York. Not a place one would associate with farms or farm machinery. I credit my parents for instilling a lot of good values, a respect for learning, a knowledge of various skills and a little knowledge of farming in me, amo
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