Time chain

Good day to all, I have a problem with the time yield of a Pick-Up Nissan Frontier 2001 Motor 2.4 are going twice that the chain joined, the first time I passed it I put the complete kit of gear chains and tensioners and in months later it jumped again, it was placed correctly and it worked another time later it was shown again, apparently everything can be done well, someone could see me that it is good to tell me that it can be good for me to tell me.

If you tense demences or leave it loose, you will always jump or sweep your teeth, tense it correctly, when weapons take the belt at the midpoint of the longest section and try to twist it at 90 degrees, if that arrives that is the right point, greetings.