Yaffe phantom fix

[jarnett]

Today I decided to try to correct a couple small issues Ive been having on my bike. One little problem is on my yaffe phantom pipe. The small heat shield close to the end of the pipe will not stay tight! Its got two small 10-24 by maybe 1/4" pan head allen screws that go through the shield into two welded on nuts. I have to tighten the damn things after about every 50 miles or so. I tried red lock tight and it does last a little longer but still they get loose. I guess the hot pipe melts the locktite. Anyway Ive had to replace both screws once or twice because they rattled all the way out and I lost them. Luckily they have these screws in stainless at home depot in 1/2" I just have to cut some of the threads off so they work. Im thinking the flaw of the design is that the screws are so short that theres not really enough thread to hold well with all the vibrations. Been brainstorming on what to do to cure it. One thought was drill through the nuts into the pipe and use a longer screw and maybe some kinda higher temp threadlocker. At least I would be using the every thread of the nut that way. I also have taps but im not sure bigger bolts would work. Any ideas or even better anyone had this problem? Maybe I just live with it as long as I have that pipe?

 

[mark whitrock]

After you cut the new ones to size take a steel punch and ding one of the treads then install with green thread lock.

 

[jarnett]

After you cut the new ones to size take a steel punch and ding one of the treads then install with green thread lock.

I like the ding the threads idea but the green specs say 300 degrees max. Im trying to find a higher temp. The red says its only removable by heating parts to 500 and its not holding.

 

[jarnett]

Heres a pic, notice the scratches from when a bolt fell out and the shield turned.

 

[Five Five]

Try some metric threads screws there a tad bigger should have an interference when screwing them in

 

[cueball]

They make a loctite for worn bearing races in hubs I can get you the part number tomorrow but the temp rating is alot higher

 

[jarnett]

Im gonna see what I can find at napa tomorrow and also try the metric bolts, but yeah if you would see if u could find that part #

 

[Mr. Wright]

green loctite:up:

 

[cueball]

Personally I wouldnt try to put metric bolts in. The thread pitch isn't even close to the same you will end up with bolts twisted off in your exhaust. Just my personal opinion.

 

[08mastiff]

Any way you can possible screw the bolts into the welded nut and drill through both of them and secure it with a cotter pin?

 

[pknowles]

After you tighten the allen screw, take a center punch and put it beside the allen screw and the threads of the nut and tap it with a hammer. If this don't work you can always tack weld the allen in after tightening. If you do the tack weld, ground right to the work and unplug you ehc,wire plus or whatever you are using before welding. hope this helps

 

[Advodka]

Can you go hex head and safety wire it?

 

[jarnett]

Guy at advance auto parts swears by the red 2620 high temp locktite. I cleaned the holes out good and dinged the screws some...def made the screws feel alot tighter goin in. Guess ill see if it if holds better this time.

 

[stlmikie]

If you were to run a bolt through to the inside of the exhaust you could put a second nut on it from the inside. Maybe?

 

[jarnett]

If you were to run a bolt through to the inside of the exhaust you could put a second nut on it from the inside. Maybe?

Yeah thats what I was thinking. I figured Id give the locktite another try with the high temp stuff, if it gets loose before 500 miles Im drilling through and see if I can get a locknut on it.

 

[hayseed]

just stack a second thin nut on top of the existing embeded one and tighten...

 

[makithapn]

I had a similar problem with locktight on my top bearing distributar bolts in race car, engine would heat up bolts would back off timing would flutuate, car would slow down :bang: my mechanic was a welder at catapillar he said use teflon paste or tape I did, no more problems
P. S. they keep locktight in a refrigarator at catapillar, and heat it to remove bolts.