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Yes, per my Volvo expert and Bay 13, when the tensioner is in WITH THE WHITE PLASTIC COLLAR, it is safe to turn the crank BY HAND because now there is enough tension on the TB. What you do NOT want to do is crank the engine by battery.
Turning the crank by is "forgiving" because you turn very slowly, and plus if the TB is missed by one or 2 teeth, no big deal because this is not enough to cause the collision between piston head and valves.
Removing the sp. plugs, you are correct that it makes it easier but why spend another 30 minutes whne you do not have to. It is just a bit harder with the sp plugs in.
cn
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