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Part built Allchin 1.5 inch

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derek blake20/10/2019 08:53:26
521 forum posts
137 photos

Thanks Jason, the hornplate holes are actually enlarged as the side stays were placed so badly by the boiler maker.

so there is space around the fixings, the bolts are tight obviously but I can’t see I’d ever want to be pulled behind the engine.

i was going to build new hornplates to match the boiler but it seemed a huge amount of work, I’ve only got normal steel bolts in there at the moment with washers.

not ideal but I had no choice unfortunately if I wanted to use this boiler.

derek blake20/10/2019 08:59:15
521 forum posts
137 photos

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derek blake20/10/2019 21:13:26
521 forum posts
137 photos

If anyone has a injector they think would work on the Allchin I’d be happy to purchase it from you, I’m told a No 2 is a good size.

im looking for second hand parts now as the engine budget has been consumed.

Regards

Derek

derek blake26/10/2019 18:05:55
521 forum posts
137 photos

Hi

so I started on the boiler clack valve today, the one that fits in the bush half way along the boiler.

One thing that’s not clear is how it fits in the bush, I’ve machined the first part of the fitting to be a push fit into the bush.

is this correct? I don’t think it’s supposed to be a screw in fitment.

regards

Derek

Paul Kemp26/10/2019 18:11:52
389 forum posts
18 photos

Derek,

Screwed or studded, it won't be a push fit. With changes of temp and pressure nothing on a boiler / steam system will be a push fit.

Paul.

derek blake26/10/2019 18:18:45
521 forum posts
137 photos

Sorry Paul, what I meant was the stub is a push fit into the bush and then I will add the four fixing studs.

what I meant was I couldn’t see a part in the drawing that says you need to make it a screw in fixing.

the bush hole was over 1/4x40 already so I machined the stub to fit into the bush.

i will then fix with the suds, I just wondered how well it would seal.

Regards

Derek

JasonB26/10/2019 18:32:33
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Moderator
17278 forum posts
1859 photos
1 articles

Just a plain 1/4" spigot to help line things up just like the shorter one on the pipe flange on the other end of the clack and pipe frpm pump. The four studs will hold it in place.

derek blake26/10/2019 19:16:13
521 forum posts
137 photos

Perfect, thank you Jason

derek blake27/10/2019 10:58:04
521 forum posts
137 photos

Anyone who’s how to remove broken 10ba tap? I was tapping fixing and it snapped in the bush angry

Regards

Derek

derek blake27/10/2019 11:35:26
521 forum posts
137 photos

c31c3a89-3789-4a27-b2a7-35e543612f79.jpeg

derek blake27/10/2019 11:37:01
521 forum posts
137 photos

I removed to section of tap but piece stuck down the hole and you can’t drill taps especially this size, I will have to use 3 fixings and make one stud a dummy, pain in the bum, first tap broken in the whole build.

Clive Brown 127/10/2019 14:16:25
344 forum posts
9 photos
Posted by derek blake on 27/10/2019 10:58:04:

Anyone who’s how to remove broken 10ba tap? I was tapping fixing and it snapped in the bush angry

Regards

Derek

I'd definitely try to remove it. Nitric acid, brick cleaner or alum will do the job. Search this site or google for "broken tap".

SillyOldDuffer27/10/2019 15:14:12
5328 forum posts
1090 photos
Posted by Clive Brown 1 on 27/10/2019 14:16:25:
Posted by derek blake on 27/10/2019 10:58:04:

Anyone who’s how to remove broken 10ba tap? I was tapping fixing and it snapped in the bush angry

Regards

Derek

I'd definitely try to remove it. Nitric acid, brick cleaner or alum will do the job. Search this site or google for "broken tap".

Alum is probably best but make sure you get the right one! Different chemicals are sold as 'Alum' for various purposes. Not all are suitable. The Alum that dissolves iron, but not copper, is Potassium Aluminium Sulphate. Accept no substitutes! ebay is your friend.

Dave

derek blake27/10/2019 16:48:27
521 forum posts
137 photos

Hi Dave

would this be feasible for a tiny 10ba bolt stuck below surface level?

regards

Derek

derek blake27/10/2019 20:03:07
521 forum posts
137 photos

I’m not sure it’s possible to soak my boiler in the Alum as it requires hot water, I’ve considered Drexel diamond tip to try and break tap up.

Paul Kemp27/10/2019 20:57:26
389 forum posts
18 photos

Derek,

Unfortunately you will have to persevere here and get the tap out as 3 studs on a 4 stud PCD will equal a leak! The diamond dental type burrs come with some very small points but you will need a steady hand! If you can nibble the centre section away the threaded sides usually drop out. 10ba is a bit tiddly though!! Good luck.

I tried Alum once didn't touch the drill I broke, obviously the wrong sort of Alum!!

Paul.

derek blake27/10/2019 21:00:17
521 forum posts
137 photos

Thanks Paul, I think I should of made the fitting a screw fit and used dummy studs to be honest!

i will try the Dremel trick, nothing to loose.

Regards

Derek

derek blake27/10/2019 21:38:06
521 forum posts
137 photos

Half hour with the dremel and no luck whatsoever, it’s like a solid plug down there so I can’t see a way or removing this tap tip.

so that opens up how I solve the fixing issue, I have three good studs inserted but will need to try and think how to solve the forth.

derek blake27/10/2019 22:30:35
521 forum posts
137 photos

I could try and make a damm around the bad hole with bluetac and add some Alum.

i think I’ve found it on eBay, I can’t boil or warm up so it may not work but I have nothing to loose.

derek blake28/10/2019 20:17:36
521 forum posts
137 photos

So I have purchased some Alum but from EBay so hopefully the right type, plasticine to make a damm around the hole and broken tap.

i cant heat the Alum up so it will just have to hopefully sit soaking for however long it takes.

i guess possible wrong Alum and cold may mean no success but it’s my only chance I think.

Edited By derek blake on 28/10/2019 20:18:13

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