Not using the pipe tape and Loctite at the same time? Because Loctite won't hold against PTFE tape.

 

I've tried a number of things; just loctitie; just tape; and half of bolt with tape (for seal) and half loctite. It appears that leakage only starts as bolt starts backing out. I will try this one more time and if it doesn't work probably go back to stock AC as the aftermarket bolts seem to be out of spec to cause loosening.

 

Did you contact the seller to hear what they recommend? Never had trouble with mine backing out using Loctite 567 paste. Hylomar like mentioned above would seal it up and not "cure" for easy removal later on, that stuff is like putty.

+1 on using the primer, most thread lockers are meant to cure against ferrous metals, so if the bolts are chrome plated along with aluminum head it can take a while relying on the anaerobic action. #243 like mentioned with a clean hole and spraying the threads with primer ahead of time will hold it. (Read directions when using, primer needs to dry and set for a bit after coating the threads) If it still comes loose there's another issue like you hinted towards

I have an extra partial aerosol can of the #7649 that I could send you, just cover shipping

 

Don't use pipe tape.. If it's gets between the flat surfaces, the clamp will not stay tight. It acts a lubricant and squeezes out to loose tension.. Permatex ultra black sealer works good here.

Other things to look at are flatness of the clamping surface.. If one is painted or powdercoated, the clamping area should be cleaned. If the brackets / banjo aren't flat, vibration can loosen fastener..

 

You don't say what bike but on my Sportster the bolts are done up to 10 ft-lbs and never come loose. I am using HD screws 3565 and no washers.

 

The bike is a sportster and the applied torque is 110 in-lb

 

Thanks for all the suggestions. I have ordered some primer and 243. If its still a problem, back to using stock breather bolts for me. Maybe the after-market breather bolt (for catch can) spec is not matched well enough for head thread? I will make sure to prep clean and properly.

 

Hi, thanks for the offer, but I went ahead and just ordered some. Im sure you will have a use for yours... as soon as you give it away (that's normally how it works lol)

 

Thought I would follow up here. While waiting for the primer and 243 to come in, I installed the bolt without pipe thread tape. Cleaned up everything throughly and tightened to spec. Bolt now is not backing out ... and no leaks. Kinda odd as the rear head breather bolt is installed with pipe tape and not a problem with that one.