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Member postings for derek blake

Here is a list of all the postings derek blake has made in our forums. Click on a thread name to jump to the thread.

Thread: Part built Allchin 1.5 inch
22/08/2019 11:08:37

Excellent, thanks Jason I shall give that a go later and see how it all lines up.

22/08/2019 10:50:08

that's Ok Jason, when I say spigot I mean the 1/16th lip that sits inside the bore on the chimney end cover.

22/08/2019 10:37:15

When setting the chimney end do I need to add the back cover spigot length onto the 1/16th clearance that end? or will the 1/16th clearance take this into account.

sorry for the dumb questions but this part was always going to be hard, and I obviously want to get it correct before drilling holes.



22/08/2019 10:30:17

Excellent explanation Jason, many thanks it should get me much closer than I was.



22/08/2019 10:07:04

Many thanks Jeff, so I have another question.

Sorry to keep asking everyone but I'm looking to line up the cylinder on the boiler and have positioned where I think it should be.

however my piston comes out the end of the bore, I've checked the lengths of the piston rod, piston and all seems perfect or near as dam it.

I'm not totally sure how much gap you need to leave each end of the bore, should piston end up a couple of mm in from the end, or go right to the end?

I did know id struggle with this part of the build, if I get one end of the travel correct it seems to hit the cover the other end.



18/08/2019 17:49:43

Afternoon all,

could someone advise where you can buy copper shims, I need to fit my steam fittings but need to space them as they won’t screw in and line up.

i can find one size washers but not ones in a different thickness like 0.2mm, 0.3mm etc etc.

any help would be great.



16/08/2019 15:40:31

sorry I just meant it had hydraulic and passed, but a boiler inspector is another level?

16/08/2019 14:24:51


So even though they are brass, there's no risk of an inspector failing the boiler?

Kind regards,


16/08/2019 13:01:44

I'm assured its safe by a boiler maker who has been building boilers for 25 years.

16/08/2019 12:54:04

screw 1.jpg

16/08/2019 12:53:41

screw 2.jpg

16/08/2019 12:53:23

Hi All

Could I ask some advice, I've received my boiler back after a year away.

but I've noticed some screws which I expected to be removed but are still there, boiler has passed test with certificate but I'm concerned about the screws as I was promised they would be removed.

I feel sick with disappointment if I'm honest.

thanks in advance

14/08/2019 11:43:31

Right I see, thanks Jason.

hopefully I can get the cylinder in the ballpark from the drawings and be able to tweak with the adjustments on the rod etc as mentioned.

I'm sure it will be fine, I just don't want to fit the cylinder in the wrong place and ruin the boiler but I think that's unlikely as I have an idea what's supposed to happen.

14/08/2019 11:15:19

Right OK, thanks Clive.

14/08/2019 10:36:43

So its been a while but a good bit of news this week, my boiler is finished and will arrive next week.

this means I can fill that gap, and see how the engine will look.

As everyone will know I'm a complete novice in building engines and as such before I'm to fix the cylinder I'd very much like to ask a question.

I do have to read the book for setting out the cylinder, however when fitting it do you make sure that the piston has an equal gap each end of the cylinder bore on forward and back stroke.

I was thinking that I leave the end cover off and watch to how far the piston slides so that the cylinder is set the right distance along the boiler.



06/07/2019 22:02:07

Thanks very much Paul and Mike.

i brought some shims to space the gears and I feel they rotate much smoother so I’m happy I think, injector I need to research how much water the Allchin holds and go from there.

i will update some new pictures soon.

05/07/2019 15:20:27


05/07/2019 15:19:18

Good afternoon

ive been working on the engine and am wanting to plum up the injector, I have one that’s to drawing but is missing a lot of the internal parts, if I wanted to use a off the shelve injector like someone has used in the below picture what number do I need, I see they they are sold as No 2,3 etc.

thank you in advance.

31/05/2019 08:30:06

Thanks Paul, its good to know I'm on the right track with the shims.



30/05/2019 23:24:23

Thank you Paul, I’m actually having difficulties with the diff at the moment.

when it’s all assembled on the axial and wheel fitted its locked up, I’m guessing the gears are too tight so I’m going to try some shims to push the gears apart slightly hopefully this will free it up as it’s awful at the moment and won’t rotate.

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