JB Weld Exhaust Studs?

[67Superhawk]

Hi All
I have a Honda CB77 with a lose exhaust stud, just spins in its hole and i cannot tighten it up. I could helicoil it but could i use JB Weld to "glue" the stud in its hole and stop it spinning?

 

[pidjones]

If you never plan to run it.

 

[Maritime]

helicoil or if enough meat is there re-tap one size up and get a new stud. there is no epoxy on the market that will survive the heat cycles at the head.

 

[teazer]

Welcome. We need more CB77 Hondas here.

Unfortunately the CB72 and 77 used really small exhaust studs and when teh nuts rust on, they tend to tear out of the head.

The good news is that you have options. You can try a helicoil, which I have done many times on those threads. Or if it's too badly messed up, you could use a TimeSert which is thicker. Or you could tap it a size larger and get a new stud machined. Either drill out the clamp to clear the new stud or make a stepped stud.

Cheapest is a Helicoil.

 

[67Superhawk]

Welcome. We need more CB77 Hondas here.

Unfortunately the CB72 and 77 used really small exhaust studs and when teh nuts rust on, they tend to tear out of the head.

The good news is that you have options. You can try a helicoil, which I have done many times on those threads. Or if it's too badly messed up, you could use a TimeSert which is thicker. Or you could tap it a size larger and get a new stud machined. Either drill out the clamp to clear the new stud or make a stepped stud.

Cheapest is a Helicoil.

thanks, it seems to have had a helicoil on the same stud in the past, i might try a larger stud or another helicoil. Have never heard of timesert though.

 

[67Superhawk]

helicoil or if enough meat is there re-tap one size up and get a new stud. there is no epoxy on the market that will survive the heat cycles at the head.

thanks, will give it a try.

 

[Rider52]

JB Weld won't survive twisting motions. Installing or removing a nut from a threaded stud will break the epoxy.

 

[crazypj]

Welcome. We need more CB77 Hondas here.

Unfortunately the CB72 and 77 used really small exhaust studs and when teh nuts rust on, they tend to tear out of the head.

The good news is that you have options. You can try a helicoil, which I have done many times on those threads. Or if it's too badly messed up, you could use a TimeSert which is thicker. Or you could tap it a size larger and get a new stud machined. Either drill out the clamp to clear the new stud or make a stepped stud.

Cheapest is a Helicoil.

I've made stepped studs for people, 8mm or even imperial sizes to fit into head and 6 or 8mm to keep exhaust flanges stock size (so you don't have odd size nuts

 

[Rider52]

I've made stepped studs for people, 8mm or even imperial sizes to fit into head and 6 or 8mm to keep exhaust flanges stock size (so you don't have odd size nuts

We did that too! I had almost forgot that trick until you mentioned it. Thanks for the memory jog!

 

[DesmoDog]

You guys probably already know this, but just to be clear there's no need to make step studs, you can buy them off the shelf... or off the internet anyway.

 

[teazer]

Good point. Internet? What's an internet?

 

[Rider52]

You guys probably already know this, but just to be clear there's no need to make step studs, you can buy them off the shelf... or off the internet anyway.

Where's the fun in buying stuff! It is so satisfying to spend 8 hours using $25K worth of tools to make a readily available $.02 item.