Hey guys, I am having problem with my tensioner bolt. I replaced the tensioner bolt when I installed the supercharger as the old one was bad. Everything was installed 300 miles ago.

Last week when I was driving home, the belt becomes too loose, making screeching sound when I rev it. Then, I realized that the tensioner bolt came loose. So I tightened it again and drive, but after 15-20 minutes drive, it came loose again. After that I figured out that each time I rev, the tensioner bolt turn a little bit, loosen itself. Anyone knows what's the issue? Is the tensioner bolt bad and need to be replaced? Will product like the threadlock help in holding the bolt in place?

Second question is about my AFR when idle. I'm currently tuned to E85. When driving, the AFR is normal at 14.7. However, when idle, it dropped to 10 and below. Is that too rich or normal? History of my tune - after first tune, my car couldn't start well and once started, it will keep stalling. I told my tuner about it and he sent me another map, which I assumed that he add more gas to it, lowering the AFR. Is the AFR too low now? I can hear some misfiring as well.

Thanks all!

 

The tensioner screw is only to adjust and not to hold the adjustment.
There is a bolt on the idler pulley/arbor that must be tightened after adjustments and released before adjustments.
Failure to do that makes the tensioner screw break.

 

Thanks for the information. Can you show me a picture of where the bolt on the idler pulley/arbor is at?

 

You access it from underneath the car. It's the bolt on the arbor.

 

By arbor, you mean the circular disk piece where the tensioner screw goes into right? I didn't feel any screw underneath it. It's all smooth and no holes available for other screw other than the tensioner screw.

 

no, you tighten the pulley that is being moved by the tensioner. Its a bitch to get to, but you have to tighten it to maintain tansion adjustment.
Have to loosen the pulley again if you want to make tension adjustments.

 

I probably know what you are talking about. I probably won't get to it in a week or two as I'm in the process of moving. Once I got to it, I will report back to see if I manage to get it fixed. Thanks a lot bro!

 

this is how the assembly looks like.

i don't see anywhere that can tighten the pulley to maintain tension adjustment. is there supposed to be a nut at the end of the arbor bolt?

 

Yep, that's it. Tightening it locks the assembly together. Jack up the car and access from underneath.

 

Sorry for the late response, have been busy moving in the past few weeks.

Won't adding a bolt and tightening it stop the pulley from spinning freely?