Some timing chain tensioners are spring loaded and hydraulic, and are locked by oil pressure when the engine runs.
Timing chains in these engines can make noise until the engine runs for a few seconds and the tensioner gets oil pressure (making it move against the chain free play).
While the engine is off, do not rotate the crankshaft backward on these engines. If the crankshaft is turned, some types of tensioners will allow the chain to skip off correct valve timing, causing much extra work.
This chain tensioner came out of its bore when the timing chain was allowed to drop.
The tensioner may have provisions for adjustment or may be self-adjusting. Check the service manual to identify the adjustment procedures.