Dougie Swan | 15/05/2022 11:55:50 |
269 forum posts 73 photos | Calling all allchin builders I have reached the stage of machining the valve chest on my engine and I have some questions I hope you can help with On the drawings there are 5 holes drilled through the cylinder base into the bottom of the valve chest from underneath, what do these do Same for the 3 5ba csk holes and one of the holes appears to be drilled through the valve stem but there is a lack of hidden view of the end elevation on my drawings Any help will be greatly appreciated Thanks Dougie |
JasonB | 15/05/2022 13:09:10 |
![]() 25215 forum posts 3105 photos 1 articles | Not made it but the 5 holes are for screws to permanently hold the chest vertically down. The 3 CSK holes permanently hold the chest horizontally. Looks like it is a "B" hole which is a blind stud hole that is near the valve stem not the through "C" countersunk hole The chest would not have been a separate part on the original but doing it separately makes it easier for us to machine the ports and port face. Edited By JasonB on 15/05/2022 13:10:42 |
Zan | 15/05/2022 13:12:15 |
356 forum posts 25 photos | I believe the original had cylinder and chest cast as a single unit. So these are 5x6ba gunmetal r head fixings to hold the chest down. there is a clear section in the centre of sheet 6 the view of the chest bottom left on the sheet shows they clear the spindle. 6 holes”a” to fix to cylinder etc
edit. Typo Edited By Zan on 15/05/2022 13:13:51 |
Dougie Swan | 15/05/2022 13:33:20 |
269 forum posts 73 photos | Thanks guys Jason, your drawings have way more detail than my set The view of the cylinder cross section doesn't appear anywhere on mine Just like before you sent me details of the steering bracket that is missing from mine, who did your drawings Thanks Dougie |
Zan | 16/05/2022 14:36:46 |
356 forum posts 25 photos | My drawings are hidden away in the loft where they have sat since 1995 when it was put on hold! I looked in the book |
Dougie Swan | 24/05/2022 14:46:15 |
269 forum posts 73 photos | Thanks for the replies But I now have another question When fixing the valve chest to the cylinder block what did you use for a sealant, I'm thinking of silicon, anybody got any suggestions Thanks Dougie |
JasonB | 24/05/2022 14:48:53 |
![]() 25215 forum posts 3105 photos 1 articles | I've used the liquid gasket from Halfords on several engines which is a form of silicon. |
Please login to post a reply.
Want the latest issue of Model Engineer or Model Engineers' Workshop? Use our magazine locator links to find your nearest stockist!
Sign up to our newsletter and get a free digital issue.
You can unsubscribe at anytime. View our privacy policy at www.mortons.co.uk/privacy
You can contact us by phone, mail or email about the magazines including becoming a contributor, submitting reader's letters or making queries about articles. You can also get in touch about this website, advertising or other general issues.
Click THIS LINK for full contact details.
For subscription issues please see THIS LINK.