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Part built Allchin 1.5 inch

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derek blake08/01/2019 13:49:45
327 forum posts
97 photos

3.2mm deep annulus on the liner obviously, with a straight 1 3/8 bore on cylinder block.

JasonB08/01/2019 16:15:57
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Ends of liner would be 1 3/8" diameter, middle of liner 1 1/4" diameter so it is no thinner than original Cylinder bored 1 3/8". It is just the stud postions on the joint that are not ideal

derek blake08/01/2019 16:59:11
327 forum posts
97 photos

Hi Jason

Well to be honest you are the experts, if you think it’s risky then I will stick to drawing.

I think the idea actually makes sense and is a much easier way of building that part of the cylinder, the screws would I guess be half in the liner and half in the casting.

I will go which ever way works without causing an issue to reliability,safety etc

Many thanks

Derek

derek blake09/01/2019 14:36:28
327 forum posts
97 photos

Hi Jason

Would it be safe to use Loctite 638 on the liner to assist the screw fixings?

its temperature range is way above what the cylinder would ever get to i think.

The liner material will be here soon, so id like to be sure i know which option to machine.

Many thanks.

JasonB09/01/2019 18:40:07
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I tend to use 648 for liners, bit higher temp to be on the safe side.

derek blake09/01/2019 20:09:22
327 forum posts
97 photos

Many thanks Jason

derek blake09/01/2019 21:04:54
327 forum posts
97 photos

Sorry to keep on guys I just want to be 100% sure before ruining bronze and casting.

The new idea and larger liner I will increase from 1 1/4 to 1 3/8 and into the liner I add the annulus at a 1/16 depth all the way round? For some reason I was thinking I’d have to double the 1/16 but that’s not the case looking at the drawing.

I just need to leave both ends of the liner 1 3/8.

I think I’m right with all that.

I will let you all know how I get on, many thanks

derek blake10/01/2019 13:04:52
327 forum posts
97 photos

material arrived so tonight is the night, I've drawn up what needs doing so hopefully all goes well.

i will post a picture of the finished liner hopefully.

Thank you for everyones help and the idea to machine this way.

derek blake10/01/2019 22:31:02
327 forum posts
97 photos

Evening all.

Liner finished, hopefully new improved version.

615a6099-3bc6-4585-81dc-cc7636cb6ba2.jpeg

2d133e5a-d4c5-4111-93f9-305e99d706e4.jpeg

Jeff Dayman10/01/2019 22:38:54
1525 forum posts
37 photos

That's looking great Derek! well done.

derek blake10/01/2019 22:42:09
327 forum posts
97 photos

Many thanks Jeff, and thank you to Keith long for the initial idea and Jason for answering my questions.

Paul Kemp11/01/2019 00:06:44
283 forum posts
9 photos

Derek,

Well done. Excellent progress. In less than 2 weeks you have gone from looking for someone to machine the cylinder for you to being almost halfway there. That includes overcoming the issue with the dodgy casting for the liner and sourcing a replacement and a bit of out of the box thinking as to how you can overcome the limitations of your machine capacity. I bet that's a lot more satisfying than paying someone else to do it and the bank manager will be happy too!

The really great thing about this forum is seeing people achieve things with a little advice they didn't think they could do. Well done indeed.

Paul.

derek blake11/01/2019 08:39:58
327 forum posts
97 photos

Many thanks Paul, you are right I feel much more confident but that's thanks to people like you on the forum who support me and help without making me feel stupid.

So many thanks again.

Derek

derek blake12/01/2019 13:15:03
327 forum posts
97 photos

Hi All

Not a very interesting picture today I’m afraid, but cleaned up the boiler kit buy ready for packing away if worse comes to worse and my original boiler is scrap

That’s one part of the engine that needs a specialist let alone good equipment so this will be something I will need to definitely send away.

Next job will be to work on piston, and water pump as until I get my boiler and Hornplates back I’m on a stop really.

derek blake12/01/2019 13:16:13
327 forum posts
97 photos

42e745e0-608a-491e-9c5f-302840fbbc66.jpeg

derek blake12/01/2019 16:50:35
327 forum posts
97 photos

Hi

I have a quick question if that’s ok, I’m not sure if anyone has the Allchin drawings but I’d like to fix the valve chest to the cylinder and I’ve drill the through holes in the check marked A but I can’t see how deep into the cylinder I need to drill ready for the tap and 6ba stud.

Can anyone assist on depth?

Thank you in advance.

Derek

JasonB12/01/2019 17:27:54
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I would say you could drill 5/16 and that would allow 2 x diameter of thread without trying to get right to the bottom of the hole, 1.5D would be OK into a 1/4" deep hole.

derek blake12/01/2019 17:33:07
327 forum posts
97 photos

Hi Jason

So I understand are you saying drill around 7-8mm deep on the A holes?

JasonB12/01/2019 18:11:52
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Yes that looks OK for the top and bottom pairs, probably 6mm for the two closest to the centre line but check what thickness you have now that the main casting has been bored out larger.

derek blake12/01/2019 18:14:21
327 forum posts
97 photos

Thank you Jason, I’m normally good with drawings but I can’t see any depths for these holes and even others.

That’s strange to me, but I maybe mis-reading it.

I will drill the 6mm deep ones for now, many thanks

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