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Don explains it like a professional tech writer. A picture would help, I'm sure, but you have the image fresh in your mind. The "rocking" is done to make sure the long stretch on the right side between the cam and the crank sprockets is tight. Actually, what you need is just a smidgen of clockwise turn on the crank bolt to ensure any looseness is on the opposite side -- where the tensioner can take it up. An eighth of a turn is more than enough.
If you don't do that, you risk trying to make the spring overcome friction in the crank (piston rings) in case the cam and crank came to a stop with the belt loose on the pull (right) side of the belt.
Very subtle, but the practice is easy and makes good sense. Don'cha just wonder what spurred Steve to add that editor's comment about tightening the nut?? Leave nothing to assumption...
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Art Benstein near Baltimore
A wife was making a breakfast of fried eggs for her husband.Suddenly, her husband burst into the kitchen. 'Careful,' he said, 'CAREFUL! Put in some more butter! Oh my gosh! You're cooking too many at once. TOO MANY! Turn them! TURN THEM NOW! We need more butter. Oh my gosh! WHERE are we going to get MORE BUTTER? They're going to STICK! Careful. CAREFUL! I said be CAREFUL! You NEVER listen
to me when you're cooking! Never! Turn them! Hurry up! Are you CRAZY? Have you LOST your mind? Don't forget to salt them. You know you always forget to salt them. Use the! salt. USE THE SALT! THE SALT!' The wife stared at him. 'What in the world is wrong with you? You think I don't know how to fry a couple of eggs?' The husband calmly replied, 'I just wanted to show you what it feels like when I'm driving.'
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