does the timing chain tensioner retracts after resetting it for installation
on a 2.7L yes... oil pressure sets the hydraulic tensioner
you also must pry on the head a little once installed to do the initial install and prep for it to fully extend properly. should see it pop up a bit enough to take some slack out of the main chain
and make sure to rotate the engine clockwise only 4 revolutions to check TDC and all timing marks
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