Tim , which bolts are you talking about? The only chain tensioner bolts I know of, are outside the motor. Did you mean the chain cover that goes between the 2 sprockets? Eric Waterman 1996 200SX SE-R 1991 Sentra SE-R (now with worjing AC after 4+ years) the upper chain tensioner was loose along because one of its bolts > was loose and the other one was missing completely!