the chain tensioner is automatic type.
do not adjust!
sources of the sound might be main bearings or rod bearing. check also woodruf key on right end cam shaft end and nut, also on balancer shaft.
if bearings have to be changed you have to dismount the whole engine. so you will see what has to be replaced / repaired.
24000 miles is not very much, i wouldn't expect an engine overhaul at this age.
did you treat her bad? ;-)
regards
klaus
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