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  #1  
Old 10-05-2019, 05:22 PM
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Default Stuck Bung.

Right...

Changing my Pyro and had to go get the right fitting because Ebay let me down..

I took out my old pyro and the reducing bush out of the dump and put the blanking bung in that come with the dump pipe.

Screwed the blanking bung in 4-5 turns by hand, tightened it with no issues, shut the bonnet and off i went.

Just got home to remove it and it's fn stuck! I can get maybe 1/10th of turn where it moves freely each way then just locks up.. Tried to force it a bit with the big bar but no luck. WTF?

99% i didn't cross thread it in... no way i could have turned it in by hand so far if i did. The reducing bush i had in there is alloy i reckon, thread looks ok on the but maybe some swarf or something is in the thread from it causing this binding issue?

Anyone got an ideas for me.. Livid right now!
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Old 10-05-2019, 06:00 PM
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Now i have walked away and calmed down....

The bung hasn't bottomed out into the thread.. Unless it is tapered maybe i did cross thread it.

Now.. How the hell am i going to get it out? Maybe get my mate rattle gun and give it ugga-duggas? and hope the damage isn't to bad. Dare say the bung will be fine but the thread in the exhaust will bare the damage. Then hope i can re-tap it.. not that i have have a M18 tap to suit.
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Old 10-05-2019, 06:16 PM
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For any part is stainless steel that has a bad habit of galling, but you mention alloy, is that an aluminium alloy? That can be worse. Soak it in a good product like Reducteur, this can help lubricate as you move it. I would use a rattle gun, I would simply try rocking it back and forward giving it an ocassional spray and see if that rocking leads to a slowl increasing movement.
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Old 10-05-2019, 06:17 PM
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Quote:
Originally Posted by Softy View Post
Now i have walked away and calmed down....

The bung hasn't bottomed out into the thread.. Unless it is tapered maybe i did cross thread it.

Now.. How the hell am i going to get it out? Maybe get my mate rattle gun and give it ugga-duggas? and hope the damage isn't to bad. Dare say the bung will be fine but the thread in the exhaust will bare the damage. Then hope i can re-tap it.. not that i have have a M18 tap to suit.


Hopefully itís just heat related.


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Old 10-05-2019, 06:26 PM
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The thread that is welded onto the dump is mild steel I reckon, Ross.

This is what the alloy? Bung looks like that come out. Thread looks pretty good actually. It's a speedflow fitting.



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Old 10-05-2019, 06:27 PM
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What are the two materials? I hope the probe isn’t stainless, as stainless is great at galling with different metals in threads.
If it is galling there’s very little success at getting it out. It will feel completely locked. Always use thread sealer, or tape at least, with stainless pipe threads.
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Old 10-05-2019, 06:30 PM
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Looks like aluminium alloy, I have some speedflow fittings around my vehicle.
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Old 10-05-2019, 06:34 PM
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Lol we posted the same thing at the same time Ross
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Old 10-05-2019, 06:34 PM
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The bung that is stuck in there now is the blanking bung that come with the exhaust when i brought it.

Pic from their website.. Looking at that the bung might be Stainless? (aluminiumized steel exhaust)

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Old 10-05-2019, 06:38 PM
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If it’s a bung that is stuck I’d prepare to drill it out with precision to the inner thread diameter, and then unthread the remains by hand
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Old 10-05-2019, 06:40 PM
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I don't have any Reducteur but i do have some INOX around here. I'll give it a good spray once it's cooled down and try again in the morning.

Do you think i'll have more luck trying to undo it in the morning when it's stone cold?
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Old 10-05-2019, 06:42 PM
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Quote:
Originally Posted by Softy View Post
I don't have any Reducteur but i do have some INOX around here. I'll give it a good spray once it's cooled down and try again in the morning.

Do you think i'll have more luck trying to undo it in the morning when it's stone cold?
Depends, did you tighten it hot or cold? Inox works OK.
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Old 10-05-2019, 06:44 PM
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Quote:
Originally Posted by geeyoutoo View Post
Depends, did you tighten it hot or cold? Inox works OK.
It was warm.. i was handling everything with my hands.
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Old 10-05-2019, 06:51 PM
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How tight did you do it up? It takes a fair bit of torque to gall a stainless thread & it has to be stainless to stainless. There's no way you could screw it in 4-5 turns by hand if it was cross threaded. Probably just heat related, give it a squirt of Inox when it's cooled down & it will probably come out pretty easily.
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Old 10-05-2019, 07:00 PM
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I didn't do it up that tight as I was only going around the corner... I was just using a shifter ( yes tsk tsk) I did think the shifter slipped off at the end.. but maybe it was the thread jumping?

As it stands.. ignore the bolt in the back ground.. that one did fall out and I did a road side dodgy to seal that up.

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Old 10-05-2019, 09:21 PM
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Actually in my experience of using stainless fasteners on an almost daily basis they are very easy to gall up and do not need that much force at all. Especially in this case where the threads are very dry, as they usually are in an EGT bung. Even with a stainless bolt into a mild steel thread. It's highly likely that this is what has happened as the socket is an O2 sensor socket not a tapered thread so it should have bottomed out, unless the bottom of the thread is damaged from the original fitment.

Unfortunately I think you only real option here is to lube it up as best you can, repeatedly, and like Ross said just keep working it backwards and forwards and gradually undo more and more each cycle and cross your fingers. I don't think cold or hot will make much difference if it has really grabbed but I would try getting the exhaust hot and trying to cool only the bung and see if that helps.
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Old 10-05-2019, 09:23 PM
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Cheers.

I'm going to get up early (pending hangover caused by this) and just lube it up and work it backwards and forwards and see how i go.
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Old 10-05-2019, 11:18 PM
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Just tried to give it some loving... No luck.

Mate reckons he will drop his dewalt rattle gun off in the morning before he goes bush. Will try that in the morning lol
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Old 11-05-2019, 07:40 PM
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Any progress here?
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Old 11-05-2019, 07:50 PM
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Nope sorry.

Had a big night.. Didn't get up till late then got my new kayak so spent the arvo fitting it out. A mate dropped me off his DeWalt Ugga Dugga at some stupid hour this morning. So if worst comes to worst i'll just send it.

I may look at it tomorrow if i don't hit the water... otherwise will be a Monday arvo job.
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