Question about 2004 Mazda 6
Nothing will make this chain jump only if the tensioner is badly worn and it has to be bad because you will hear it long before it bounces off ,and only then if it backfired i suppose ,cant help with a diagram where the timing marks are though but i can tell you how to check it ,firstly the timing marks are on the end of the cams either a horizontal flat or a mark on the bearing cap,if not sure then bring No 1 to TDC the with teh rocker covers off look at the valves and with no1 at tdc then both inlet and exhaust valves will be fully closed with the peaks of the cams pointing outwards at opposing angles .Now low or no oil could cause the cams to seize but before this happened the hydraulic tappets would start making loud clacking noises then either the cams would seize or more likely the big ends would start banging away ,then eventualy a big end cap would come flying throught the side of the engine block or it would just lock up ,either could happen .But i cant see the timing chain jumping ,a belt now thats a different ball game ,i used to test engines to destruction in fords many years ago and the main cause of failure was con rod snapping or timing belt ,but the engines with a timing chain never failed for the chain ,con rod or piston burnt a hole through itself .
Posted on Dec 11, 2009
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Posted on Jan 02, 2017
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