Is JB welding a decomp hole stupid?

Angry Hipster /
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I did it but now I'm having second thoughts about running it.

Re: Is JB welding a decomp hole stupid?

I like to tap the hole and thread in a set screw with permanent loctite.

Re: Is JB welding a decomp hole stupid?

I think it will be fine. I'd run it. I did the same for a Puch motor where someone drilled the stator plate bolt hole too deep causing a hole going into the crankcase. Not sure why they were drilling it to begin with but I filled it with JB weld and it gave me 0 issues. (edited)

Re: Is JB welding a decomp hole stupid?

I did this with that JBweld steelstik stuff on my Hobbit even though it said not to get it hotter than 300 degrees and it wound up melting and getting stuck in the head/exhaust. So check the temperature range on that JB weld

Re: Is JB welding a decomp hole stupid?

Angry Hipster /

J-B Weld can withstand a constant temperature of 500 °F (260 °C), and the maximum temperature threshold is approximately 600 °F (316 °C) for 10 minutes.

Re: Is JB welding a decomp hole stupid?

> Thomas Davis Wrote:

> -------------------------------------------------------

> J-B Weld can withstand a constant temperature of 500 °F (260 °C), and

> the maximum temperature threshold is approximately 600 °F (316 °C) for

> 10 minutes.

JB weld but not JB quik

Re: Is JB welding a decomp hole stupid?

Angry Hipster /

So I chickened out and removed all traces of JB Weld. I ordered a tap and set screws.

It did seem to seal very well and I have no doubt it would have sealed compression, but the question is for how long.

I've rebuilt the engine and have done everything else right so I couldn't risk having glue in the engine.

Re: Is JB welding a decomp hole stupid?

> DPC Ryan Wrote:

>.

>

> JB weld but not JB quik

Yes! I usually thread a set screw in there then JB weld over the top of it.

Re: Is JB welding a decomp hole stupid?

Fine, Do it all the time....I even used ultra gray silicone....

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