hey buddy your ok so dont kill yourself over it. remember that your cam/s are basically spring loaded so when you removed the remains of your old belt you let the tension go from whatever valve was compressed( your ok ) you sould find a way to align all your timming marks as you install the belt. clamps with e rubber teeth like for wood work are great for this. place your crank at its proper position by turning it by hand you can do this if youve removed the spark plugs ( commpression) or put a socket on there with a breaker bar but remember to move in the tightening direction( or it will fly off when you start it) once youve done that place the belt on the crank pulley and use one of those clamps or an assistant. route th belt toward your 1st cam (iether one) and place that one at its correct position, then place the belt on it keeping it tight but not so much as to move the crank. then do the same for the next pulley. finish it off with adjusting your tensioner ( if required) and your set. the metal noise you heard migt have been a lifter or a valve closing or even a valve comming in contact with a piston ( dont worry that isnt enough force to damage iether) so if your having a real hard time placeing your timming marks into position try the other cam or make sure the cank is alligned. good luck
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