Disaster with boiler boss thread

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Disaster with boiler boss thread

Post  IanR on Sat 01 Apr 2017, 6:58 pm

I've had a bit of a disaster with the thread for one of the studs in one of the check valve bosses in the boiler. The stud would not screw in very well so I thought I would clean out the thread with an M3 tap. But I couldn't get the tap to start in the thread. (I think the tap was bottoming out in the hole because it was so shallow). So I ended up just trying to screw the stud in anyway. it only went in about 2 turns or so and when I tightened up the nut it pulled the stud out. Now it looks like there is no thread at all in the hole.

I'm waiting for a call back from Steve but in the mean time I wondered if anyone has any idea about how this may be able to be got round given that I obviously don't want to do anything to compromise the boiler?

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Re: Disaster with boiler boss thread

Post  Mike King on Sat 01 Apr 2017, 7:42 pm

That's a strange one
When i received my boiler the studs were already prefitted in place at STW. Do your instructions mention fitting the studs,? Or maybe broken? Mike

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Re: Disaster with boiler boss thread

Post  Simon B on Sat 01 Apr 2017, 8:43 pm

Hi Ian

When I was fitting my cylinder I over tightened one of the studs and damaged the thread in the boiler. I spoke to Steve and the advice was to fit a helicoil as this is stronger than the original thread.

Cheers

Simon
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Re: Disaster with boiler boss thread

Post  IanR on Sat 01 Apr 2017, 9:34 pm

Thanks Simon, That looks encouraging. Having looked ad YouTube for fitting a helicoid I think I'll need some assistance from someone with more engineering experience than me but at least it looks like a possible way forward.

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Re: Disaster with boiler boss thread

Post  lynnr on Sun 02 Apr 2017, 10:44 am

Helicoil as Steve said. I have seen them used on larger boilers, like paper mill sized.
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Re: Disaster with boiler boss thread

Post  LiveSteam on Mon 03 Apr 2017, 9:09 pm

Yep helicoils are the way forward, I've got about 3 on my safety valves due to stripped threads on the cylinder block (not my doing )

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Re: Disaster with boiler boss thread

Post  IanR on Wed 05 Apr 2017, 5:15 pm

I've been in contact with Steve. He said they would try to helicoil it. But he's not sure if it's viable on threads that small. He also said there are other options but they would need the boiler to be stripped down. So I hope it doesn't come to that. I'm taking it up there after Easter.

Are you going to be at Basingstoke on Sunday? If so I'll see you there.


Last edited by IanR on Wed 05 Apr 2017, 8:15 pm; edited 1 time in total

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Re: Disaster with boiler boss thread

Post  LiveSteam on Wed 05 Apr 2017, 7:42 pm

IanR wrote:

Are you going to be at Basingstoke on Sunday? If so I'll see you there.

Yes Ian, we'll be there all weekend, be good to catch up again and see the progress.

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Re: Disaster with boiler boss thread

Post  LiveSteam on Fri 21 Apr 2017, 8:16 pm

It was good to see you again at Bassingstoke, also good to see another years progress on the engine.

How have you got on with the Boiler issue ?

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Re: Disaster with boiler boss thread

Post  IanR on Fri 23 Jun 2017, 3:53 pm

My wife picked up the engine yesterday from STW towers. May thanks to Steve and especially to Ian who did the work and also sorted out a problem I had with the diff / final drive. All looks good. Its n now on my newly acquired lifting table.



Now I can start getting on with finishing it!

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Re: Disaster with boiler boss thread

Post  LiveSteam on Mon 26 Jun 2017, 7:37 pm

Excllent, looking forward to seeing you in steam at Bassingstoke next year Cool

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Re: Disaster with boiler boss thread

Post  IanR on Wed 28 Jun 2017, 12:52 pm

Hopefully will, with a bit of luck!

Been fiddling with the water pump for last few days. (it is really fiddly to bolt into place on the 2"). Think I'm going to have shorten the bypass pipe supplied.

I'll try to start getting more progress photos posted in my thread on the photos section.

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