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Well, one does if they intend on doing the job *by the book*. There's nothing wrong in doing the job in this manner IF the engine is not a high mileage unit. The timing chain does stretch, when it does that throws off the cam timing making it late. If one does not release the cam sprockets to *reset* them to the *new* position when rotating the crank for #1 top center & locking them down you will end up with the same late cam timing you started with.

I would consider 150,000 miles (240,000 kilometers) a definite candidate for a timing chain. I've had LA1/LH0 engines apart that had 170,000 kilometers or so on them & the timing chain was stretched to the point where the cam timing was late by near 10 crank degrees. The LQ1 engine has a tensioner on the heel side of the chain so the chain won't necessarily be loose & rattle, when one manually moves the dampener back & forth one doesn't feel & see that customary *loose gap* that one will notice with the pushrod engines that do have a worn chain & the chain allows the crank to move for a few degrees without moving the cam. *the LQ1 has an advantage that the pushrod engines do not....one can get away with the original timing chain (assuming it does not break later somewhere down the road) when doing the cam belt. If one does the cam timing *by the book* one resets the cam cog positions to the crank *straight up* centerline, even tho the chain may be stretched the cams will be in proper time with the crank.

Thank you for posting this video. After looking at it I can now safely say I will never attempt this job on my own. That's why these videos are so valuable. They not only provide a first hand practical look at how it's done, they also serve to give you a beforehand choice on whether or not you want to even attempt the task. I'm out. Kudos to Memphis Man for freeing up the huge part of a day of my life for me.