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with belt drives there is normally a shaft which drives the belt, and a another that is driven.
taking the rotation direction into account, you can then predict which side of the belt will be more slack. one segment has the mechanical tension due to the load it is transmitting , the other side is basically returning the belt and has less tension
when the engine is not running , during adjustment, both sides have equal tension unles therre is some sort of load on the belt. during operation , the side that has less tension ( the slack side) is going to "slap" more than the side with more tension.
taking that into account may help explain something about these clearance adjustments.
in general with belts , when you are adjusting it, the tension on the two sides of the belt will likely be equal because the belt is then not seeing its normal load
possibly other factors do apply tension even in a static state, like for example. if a shaft is locked in place and the valvetrain is applying tension to one side of the belt.
Im not familiar enought to advise wiht the particulars of this adjustment but this maybe a factor to put a bit of thought towards..
in some drives the tension can reverse when the load is changed, a belt drive may see a reversal of the normal slack and tension side.
easy example a belt is driven by a motor, the motor is switched off and now the machine it was powering which still has inertia is driving the motor , the belt tension may reverse while it is "winding down" towards a stop.
perhaps when you switch from accelleration ot decelleration you could see some such effects
also yes, as the above poster indicated , It may be important to be on the "correct side" of the eccentric. this is common with eccentric adjustments. in some cases this matters.
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