Shop found out the CAM an crank sensor won't sync up

I have this Sebring 2.7 cracked the block so I got it fixed everything new on top heads, timing, cam, ect. Drives good for about 8 month all of a sudden one day won't turn over towed to shop found out the cam an crank sensor won't sync up, so we wiggle the cam sensor car cranks up so mechanic put a phat oring around the sensor an stuffs it in the whole very tight so we move sensor around till car starts an let go of sensor done deal car cranks all the time we just leave the sensor screw out fat oring holds in place but after a while oring need to be replaced cause it becomes thin from heat so I replaced it a few times then got to thinking what kind of mechanic would use this as a solution an charge me 125.00 he need to fix this thing cause I feel like the problem is in his work anyway some were in the cam wheel or timing chain or cam sprocket. Because the cam sensor is good it's a mapor and it won't even throw a code for cam sensor or crank sensor so I took both valve cover heads off an looke for the timing marks I can't see th mark on the primary chain but I do see the mark on the rear cam sprocket also on the secondary chains I count the links should be 12 links between marks on the rear secondary chain it is correct 12 links not links but marks dots whatever u wanna call it on the chain but on the front one I count 13 links also the chain appeared to be loose but as I bumped the motor with the key the primary tension extended out further an took all the slake away I must say.I just don't see the dark link that should line up wit the timing mark on the primary chain rear cam sprocket, an I count 13 links on the front cam sprocket for the timing mark on the cam sprocket. HELP PLEASE HELP ALSO IT SEEM LIKE THE WATER PUMP WAS FAILING CAUSE NO HEAT AT IDEAL OR REVEN AN THE THE CAR WOULD SLIGHTLY OVER HEAT BUT THEN WEN DOIN ABOUT 50 miles hr heat kicked in an car cooled down an ran as normal as it should I was wondering if this was also a timing chain issue cause I had some one to crank the car with the valve covers off so I could look an see if a sprocket was bent or see any thin out of the norm but only thing I notice was the main tensioner was clicking as the car was turning it was makin a clicking sound don't no if it was retracting back an forth or what is this noise ok? Thanks