6bangr

I am replacing a couple idler pulleys and the Ford manual doesn't say anything about using thread locker on the pulley bolts. Given the level of vibration in the belt drive it seems like it wouldn't be bad idea.
Are there any issues with putting a bit of blue thread locker on the pulley bolts?

jpplaw

Should be ok to use the blue. Just don't overdo it.

bstang14

Loctite blue is good and won't present removal issues.

6bangr

Good stuff. I didn't think it would be a problem; I just wanted to double check that it wouldn't cause any bearing or pulley alignment issues. I didn't use it the first time I replaced my idlers. I think this time I'll give the bolts a little dab.

tx_zstang

blue wont hurt. torque to 18 ft-lbs.

6bangr

Finished the task, used a little of the blue stuff and didn't over torque anything. Finally got rid of my cold start squeak issue, fingers crossed.
I originally suspected the issue was related to my Roush tensioner, however, the culprit was the lower grooved idler pulley (part #6L3Z-6C348-A - thanks for confirming that part # tx_zstang). I didn't know that the grooved idler is made of plastic, I'm surprised the bearing lasted as long as it did.