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Old 12-12-2010, 02:50 PM
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4x4_Welder 4x4_Welder is offline
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Join Date: Dec 2009
Location: Poulsbo, WA
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Because the tensioners for the timing chain are set up to maintain tension in the proper direction. In the other direction, the tensioners can be compressed, and allow slack to build on the normally tensioned side. If there is enough slack, the chain can then skip a few teeth and your timing is lost. Too far, and you can have valves and pistons meeting up.
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